When sourcing sodium sulfate for sale, industrial procurement teams face a landscape where cost, purity, and logistical reliability must align perfectly. Sodium sulfate anhydrous (Na2SO4), particularly at 99% purity, is a staple in detergent, glass, textile, and kraft paper manufacturing. Securing a consistent, high-grade supply can directly impact production yields and final product quality. This comprehensive guide explores the chemical properties, major applications, buying criteria, price determinants—including the influence of the sodium sulphate price in Pakistan—and practical supplier evaluation so you can source with confidence.
Sodium sulfate, known chemically as Na2SO4, is an inorganic salt with a molar mass of 142.04 g/mol and a density of 2.66 g/cm³ in its anhydrous form. It appears as a white, free-flowing crystalline powder and melts at 884°C. It is highly soluble in water, and its solubility increases with temperature up to about 32.4°C before declining—a property exploited in some industrial processes.
The compound is hygroscopic, meaning it can absorb moisture from the air, so appropriate packaging and storage are essential to prevent caking. Its neutral pH in solution and non-reactivity with many chemicals make it an ideal filler, flux, and processing aid across multiple industries.
Key sodium sulfate chemical properties that industrial buyers monitor include:
This compound is produced either synthetically (via Mannheim or Hargreaves processes) or from natural sources, such as salt lakes and brines. Major natural producers include Pakistan, China, and the United States, while synthetic output often serves markets requiring ultra-low heavy metal content.
Our high-purity sodium sulphate anhydrous (99% min) meets the most demanding industrial specifications and is available for bulk global shipment.
Sodium sulfate is best known as a cost‑effective filler in powdered laundry detergents. It acts as a physical diluent, allowing formulators to adjust bulk density and control production costs without affecting the surfactant system. The inert nature of Na2SO4 means it supports the flow and packaging characteristics of the final powder. Typical inclusion rates range from 20% to 60% by weight, depending on the detergent brand and desired bulk density.
In the glass industry, sodium sulfate serves as a fining agent and sodium oxide source. Introduced into the batch, it reduces the melting temperature, promotes bubble removal, and helps homogenise the melt. Crucially, its high purity directly influences optical clarity. Contaminants such as iron and nickel are tightly regulated because nickel can form nickel sulphide inclusions in the glass, which can cause spontaneous fracture in tempered products. Using a 99% pure sodium sulfate with certified low nickel content (<1 ppm) significantly reduces this risk, making it a strategic material for architectural and automotive glass manufacturers.
Textile mills use sodium sulfate as a levelling agent or electrolyte in reactive dyeing of cellulosic fibres. It promotes uniform dye uptake by reducing the negative electrical charge on the fibre surface, allowing the dye to exhaust more evenly. Consistent quality, free from organic residues, is essential to avoid uneven dyeing and rework.
In the kraft process, sodium sulfate is added to the recovery boiler to replenish sodium sulphide and make up for chemical losses. It acts as a chemical feedstock, ensuring the pulping liquor maintains the correct alkalinity and sulphidity. While technical‑grade material is often sufficient, higher purity reduces the introduction of inert contaminants into the chemical loop.
Not all sodium sulfate is created equal. When evaluating offers of sodium sulfate for sale, procurement managers should scrutinise the following parameters to ensure the material matches the intended application:
Suppliers who can provide consistent particle size, batch‑to‑batch uniformity, and full‑traceability documentation will minimise your production risks.
Pakistan is one of the world’s largest exporters of natural sodium sulfate, primarily from the salt‑rich deposits in the Khewra region and the vast Thar Desert. The sodium sulphate price in Pakistan often serves as a benchmark for spot cargoes in Asia, the Middle East, and Africa. Several factors influence Pakistani export prices:
As of late cycle averages, sodium sulphate FOB Karachi prices have ranged between $80 and $110 per metric tonne for 99% anhydrous material. For buyers in regional markets, sourcing from Pakistan can offer a landed‑cost advantage compared to synthetic material from Europe or East Asia, provided quality and reliability are assured.
Working with a supplier that has direct lines to Pakistani producers—or that maintains strategic stockpiles—can help you hedge against price swings. Weifang Hailei Fine Chemical Co., Ltd. sources top‑tier sodium sulfate and ensures competitive pricing delivered globally.
A common search query asks: what is sodium sulfate in shampoo? Industrial buyers who also encounter this in B2C contexts may be puzzled. Let’s disentangle the chemistry.
Sodium sulfate (Na2SO4) is occasionally found in solid shampoo bars or powder formulations as an inert filler or anti‑caking agent. It has no surfactant properties and does not generate foam. The cleansing and lathering agents in liquid shampoos are sodium lauryl sulfate (SLS) and sodium laureth sulfate (SLES), which are chemically distinct organic sulfates. The confusion arises from the similar‑sounding names.
In certain “natural” solid shampoo bars, a small amount of sodium sulfate may be added to help the bar retain its shape during storage and use. However, its role is purely physical, not functional. If you are procuring sodium sulfate for personal care product manufacturing, you must insist on cosmetic‑grade certification with strict microbiological and heavy metal limits—far more rigorous than standard industrial grade.
For industrial applications, sodium sulfate’s bulky, inert character makes it perfect as a detergent filler, but not as a foam booster. Understanding this distinction helps avoid costly formulation errors.
Glass manufacturers are acutely aware of nickel sulphide in glass defects. Tempered glass, used in building facades, shower doors, and automotive windows, is susceptible to spontaneous breakage if microscopic nickel sulfide inclusions are present. These inclusions result from nickel contaminants introduced through raw materials or cullet. When glass is heat‑treated, nickel sulfide undergoes a phase change that expands over time, causing glass to shatter unpredictably.
How does sodium sulfate tie into this? Sodium sulfate is often used as a fining agent in the glass batch, and if it carries nickel impurities, it becomes a contributor to the defect. Top‑tier flat glass and container glass producers now specify sodium sulfate with nickel content below 1 ppm, and often require ICP‑MS analysis certificates with each shipment.
Using 99% pure anhydrous sodium sulfate from a supplier that proactively monitors trace nickel ensures:
For glassmakers, the small price premium for ultra‑low‑nickel sodium sulfate is negligible compared to the cost of a single rejected architectural glazing order or a recall.
Procuring sodium sulfate for sale is only half the equation—getting it to your plant safely is equally critical. Anhydrous sodium sulfate is hygroscopic, so moisture protection is vital during ocean freight and warehouse storage. Best practices include:
Partnering with an experienced chemical exporter who manages the full logistics chain—from factory to your nearest port—removes a significant burden from your procurement team.
With dozens of suppliers offering sodium sulfate for sale, how do you pick one that truly delivers value? Use this checklist to vet potential partners:
At Hailei Chemical, we combine a robust quality assurance programme with flexible logistics to serve detergent, glass, textile, and pulp manufacturers worldwide. Every shipment of our sodium sulphate anhydrous comes with a detailed CoA, and we maintain buffer stocks to ensure just‑in‑time deliveries.
Navigating the market for sodium sulfate for sale demands a clear understanding of your technical requirements and the global supply landscape. Whether you need a detergent filler that flows perfectly in automated dosing, a glass fining agent that won’t introduce nickel sulphide defects, or a textile leveller with batch‑to‑batch consistency, the right supplier makes all the difference. By prioritising purity, verifying trace metal certificates, and building a relationship with a supplier who understands both the chemistry and the logistics, you can lock in a stable, cost‑effective raw material stream.
Explore our comprehensive product range and request a competitive quote for your next purchase. Visit our sodium sulphate product page or reach out for a customised quotation tailored to your volume, packaging, and delivery needs.
Procurement managers and chemical engineers in the pulp and paper industry know that not all sodium sulfate for sale meets the strict specifications required for the kraft process. As a leading exporter from China, Weifang Hailei Fine Chemical Co., Ltd. provides high-purity anhydrous sodium sulfate (Na2SO4) that consistently delivers in this demanding application. Unlike generic commodity supplies, our 99% pure product is engineered to minimize iron carryover, reduce scaling in recovery boilers, and ensure a stable chemical balance in the pulping cycle. Whether you operate a kraft mill in Pakistan, a detergent plant in the Middle East, or a glass factory in Europe, understanding the chemical properties and supply chain dynamics can make the difference between smooth operations and costly downtime. In this article, we explore the pivotal role of sodium sulfate in kraft pulping, unpack the key quality parameters, and broaden the view to its use in detergents, glass, textiles, and even personal care products like shampoo.
The kraft (sulfate) process remains the dominant method for producing strong, high-quality paper from wood chips. Central to this process is the recovery of pulping chemicals—sodium hydroxide and sodium sulfide—from the spent black liquor. As the black liquor is combusted in the recovery boiler, the organic matter burns off, leaving a smelt of sodium carbonate and sodium sulfide. This smelt is dissolved to form green liquor, which is then causticized with lime to regenerate white liquor for cooking. During this intensive cycle, small but unavoidable losses of sodium and sulfur occur, primarily through residual chemicals in the washed pulp and through emissions.
Here is where sodium sulfate anhydrous enters as the critical makeup chemical. Added directly to the black liquor before it enters the recovery boiler, the sulfate ion is reduced to sulfide in the high-temperature, reducing atmosphere of the boiler char bed. This reaction replenishes both the sodium and sulfide inventory of the cooking liquor, maintaining the sulfidity level necessary for efficient delignification and fiber strength. Without a consistent, high-quality source of sodium sulfate, the entire chemical equilibrium of the mill is disrupted, leading to higher consumption of caustic soda, reduced pulp yield, and elevated operating costs.
Impurities in makeup sodium sulfate can have outsized consequences. Chlorides, for example, lower the melting point of the smelt and can accelerate corrosion of boiler tubes. Iron, even at trace levels, can catalyze cellulose degradation during the cook and end up in the final pulp, affecting brightness and bleaching chemical demand. This is why mills that truly optimize their chemical balance demand sodium sulfate with iron content below 20 ppm and chloride below 100 ppm—specifications that Hailei Fine Chemical exceeds with routine 99% purity material.
To appreciate its versatility, one must first understand the sodium sulfate chemical properties. Sodium sulfate (Na2SO4) exists mainly in two forms: the decahydrate (Glauber’s salt, Na2SO4·10H2O) and the anhydrous form. For industrial applications like kraft pulping, detergent manufacturing, and glass production, the anhydrous grade is preferred because of its higher sodium sulfate content, lower freight costs, and non-caking behavior.
| Property | Value (Anhydrous) |
|---|---|
| Molecular Formula | Na2SO4 |
| Molar Mass | 142.04 g/mol |
| Appearance | White crystalline powder |
| Density | 2.664 g/cmÂł |
| Melting Point | 884 °C |
| Solubility in Water | Approx. 4.76 g/100 mL at 0 °C; 42.7 g/100 mL at 100 °C (unusual retrograde solubility above ~32 °C) |
| pH (5% solution) | 6–8 |
| Hygroscopic Nature | Low; resists caking in ambient conditions |
The retrograde solubility curve—where solubility decreases slightly with temperature above about 32 °C—is important in crystallizer design for sodium sulfate recovery. For the industrial buyer, the low hygroscopicity of the anhydrous form means it stays flowable in silos and big bags, a practical advantage in bulk handling.
Not every lot of sodium sulfate for sale is equal. Kraft mills, particularly those producing bleached grades for paper and board, require a tightly controlled feedstock. The following table reflects the typical specification sheet of Hailei’s high-purity anhydrous sodium sulfate, which surpasses the minimum requirements of most end-users.
| Parameter | Hailei Typical Value | Typical Industrial Requirement |
|---|---|---|
| Na₂SO₄ purity | ≥ 99.0% | ≥ 97.5% |
| Moisture | ≤ 0.3% | ≤ 0.5% |
| Water insolubles | ≤ 0.05% | ≤ 0.10% |
| Iron (Fe) | ≤ 10 ppm | ≤ 20 ppm |
| Chloride (Cl) | ≤ 50 ppm | ≤ 100 ppm |
| Calcium + Magnesium | ≤ 200 ppm | ≤ 400 ppm |
| pH (5% aq. soln.) | 6.5–7.5 | 6.0–8.0 |
Procurement tip: Always request the certificate of analysis (COA) and ensure the supplier uses washing and drying processes that minimize residual mother liquor—the main source of chlorides. Our anhydrous sodium sulfate is produced via a robust evaporation and crystallization route, resulting in a product that not only meets but often significantly undercuts these impurity limits.
In the production of synthetic laundry detergents, sodium sulfate serves as an inert filler that allows formulators to standardize active surfactant concentration. Because it is compatible with anionic surfactants and does not affect the detergent’s alkalinity profile, it is used at levels up to 40% by weight in some powder formulations. The anhydrous grade helps prevent caking in detergent packs and aids in achieving a uniform particle size distribution. Here again, low iron content is vital to avoid staining of fabrics.
In the glass industry, sodium sulfate acts as a fining agent, added to the batch to help release small gas bubbles during the melt. It also functions as an oxidizer to maintain the redox balance in amber and flint glass. However, glassmakers must be aware that sodium sulfate is not a source of nickel sulfide inclusions. Nickel sulphide in glass—a critical concern for tempered glass—originates from nickel-bearing contaminants in cullet or raw materials, not from the sulfate batch component. When sourcing sodium sulfate for glass, the key parameter is consistent particle size to avoid segregation in the batch house, along with low levels of heavy metals that could discolor the melt.
Textile mills employ sodium sulfate as a leveling agent in direct, sulfur, and reactive dyeing. By moderating the rate of dye exhaustion, it ensures even color uptake on cellulosic fibers like cotton and rayon. A consistent, fine crystalline structure—like Hailei’s product—dissolves quickly in dye baths, reducing processing time and preventing particulate deposits on fabric. The near-neutral pH protects sensitive dyes and fabrics from hydrolytic attack.
Sodium sulfate is a precursor for the production of sodium sulfide, sodium silicate, and ultramarine pigments. In these downstream syntheses, high purity reduces unwanted side reactions and increases the yield of the target compound. Our customers in the chemical sector value the batch-to-batch consistency that Hailei delivers, supported by rigorous process control and third-party laboratory testing.
You may be surprised to find an industrial chemical in your bathroom, but what is sodium sulfate in shampoo? In cosmetic formulations, sodium sulfate—often as part of a blend in shampoos, body washes, and toothpaste—primarily functions as a viscosity builder. It helps thicken the product by promoting the arrangement of surfactant micelles, giving the desired pour behavior and sensory feel. It is chemically inert, non-toxic, and approved by regulatory bodies for use in rinse-off products. While the cosmetic grade requires ultra-high purity and often undergoes additional purification, the fundamental sodium sulfate molecule is identical to the industrial grade. Hailei does not supply the cosmetic market directly, but many of our buyers in the detergent and surfactant manufacturing sectors use anhydrous sodium sulfate as a precursor to producing sodium lauryl sulfate (SLS) and sodium lauryl ether sulfate (SLES)—the true cleansing workhorses in shampoos.
For buyers in South Asia, the sodium sulphate price in Pakistan is influenced by a combination of regional dynamics and global benchmarks. Pakistan is a significant importer of this commodity, relying on Chinese and Indian supply. Key pricing factors include:
While we do not publish spot prices due to market volatility, Hailei Fine Chemical is known for offering some of the most competitive FOB/CIF quotations to Pakistani buyers. We ship 1,000–25,000 kg lots in 25 kg or 1,000 kg PP/PE bags, and we can arrange containerized or break-bulk deliveries. For an up-to-date custom quotation, simply provide your required spec, monthly tonnage, and preferred port of discharge.
With over two decades of production and export experience, Weifang Hailei Fine Chemical Co., Ltd. has established itself as a trusted partner for industrial chemical procurement. Here is what sets us apart when you search for sodium sulfate for sale:
Store anhydrous sodium sulfate in a cool, dry, well-ventilated area away from moisture. Although it is not highly hygroscopic, prolonged exposure to high humidity can cause surface caking. Keep containers sealed when not in use.
Sodium sulfate is not classified as dangerous under GHS or major transport regulations. It can cause mild eye or respiratory irritation as a fine dust, so use appropriate dust control and personal protective equipment (PPE).
We typically accept orders starting from one 20-foot container (20–28 metric tons), but we can accommodate smaller trial orders. Contact our sales team for options.
If stored properly, anhydrous sodium sulfate has an indefinite shelf life. It does not decompose or degrade under normal storage conditions.
Whether your operation is a kraft paper mill tightening its chemical recovery efficiency, a detergent formulator needing reliable filler, or a glass manufacturer optimizing melt quality, the right sodium sulfate source makes all the difference. At Hailei Fine Chemical, we don’t just offer sodium sulfate for sale—we deliver a partnership in quality, consistency, and industrial expertise.
Explore the full specifications, request the latest COA, and discuss your supply needs by visiting our Sodium Sulphate product page. For a personalized quote tailored to your volume and shipping requirements, get a quote today and let our team demonstrate why leading buyers trust Hailei as their chemical backbone.
Procurement managers and chemical engineers in the pulp and paper industry know that not all sodium sulfate for sale meets the strict specifications required for the kraft process. As a leading exporter from China, Weifang Hailei Fine Chemical Co., Ltd. provides high-purity anhydrous sodium sulfate (Na2SO4) that consistently delivers in this demanding application. Unlike generic commodity supplies, our 99% pure product is engineered to minimize iron carryover, reduce scaling in recovery boilers, and ensure a stable chemical balance in the pulping cycle. Whether you operate a kraft mill in Pakistan, a detergent plant in the Middle East, or a glass factory in Europe, understanding the chemical properties and supply chain dynamics can make the difference between smooth operations and costly downtime. In this article, we explore the pivotal role of sodium sulfate in kraft pulping, unpack the key quality parameters, and broaden the view to its use in detergents, glass, textiles, and even personal care products like shampoo.
The kraft (sulfate) process remains the dominant method for producing strong, high-quality paper from wood chips. Central to this process is the recovery of pulping chemicals—sodium hydroxide and sodium sulfide—from the spent black liquor. As the black liquor is combusted in the recovery boiler, the organic matter burns off, leaving a smelt of sodium carbonate and sodium sulfide. This smelt is dissolved to form green liquor, which is then causticized with lime to regenerate white liquor for cooking. During this intensive cycle, small but unavoidable losses of sodium and sulfur occur, primarily through residual chemicals in the washed pulp and through emissions.
Here is where sodium sulfate anhydrous enters as the critical makeup chemical. Added directly to the black liquor before it enters the recovery boiler, the sulfate ion is reduced to sulfide in the high-temperature, reducing atmosphere of the boiler char bed. This reaction replenishes both the sodium and sulfide inventory of the cooking liquor, maintaining the sulfidity level necessary for efficient delignification and fiber strength. Without a consistent, high-quality source of sodium sulfate, the entire chemical equilibrium of the mill is disrupted, leading to higher consumption of caustic soda, reduced pulp yield, and elevated operating costs.
Impurities in makeup sodium sulfate can have outsized consequences. Chlorides, for example, lower the melting point of the smelt and can accelerate corrosion of boiler tubes. Iron, even at trace levels, can catalyze cellulose degradation during the cook and end up in the final pulp, affecting brightness and bleaching chemical demand. This is why mills that truly optimize their chemical balance demand sodium sulfate with iron content below 20 ppm and chloride below 100 ppm—specifications that Hailei Fine Chemical exceeds with routine 99% purity material.
To appreciate its versatility, one must first understand the sodium sulfate chemical properties. Sodium sulfate (Na2SO4) exists mainly in two forms: the decahydrate (Glauber’s salt, Na2SO4·10H2O) and the anhydrous form. For industrial applications like kraft pulping, detergent manufacturing, and glass production, the anhydrous grade is preferred because of its higher sodium sulfate content, lower freight costs, and non-caking behavior.
| Property | Value (Anhydrous) |
|---|---|
| Molecular Formula | Na2SO4 |
| Molar Mass | 142.04 g/mol |
| Appearance | White crystalline powder |
| Density | 2.664 g/cmÂł |
| Melting Point | 884 °C |
| Solubility in Water | Approx. 4.76 g/100 mL at 0 °C; 42.7 g/100 mL at 100 °C (unusual retrograde solubility above ~32 °C) |
| pH (5% solution) | 6–8 |
| Hygroscopic Nature | Low; resists caking in ambient conditions |
The retrograde solubility curve—where solubility decreases slightly with temperature above about 32 °C—is important in crystallizer design for sodium sulfate recovery. For the industrial buyer, the low hygroscopicity of the anhydrous form means it stays flowable in silos and big bags, a practical advantage in bulk handling.
Not every lot of sodium sulfate for sale is equal. Kraft mills, particularly those producing bleached grades for paper and board, require a tightly controlled feedstock. The following table reflects the typical specification sheet of Hailei’s high-purity anhydrous sodium sulfate, which surpasses the minimum requirements of most end-users.
| Parameter | Hailei Typical Value | Typical Industrial Requirement |
|---|---|---|
| Na₂SO₄ purity | ≥ 99.0% | ≥ 97.5% |
| Moisture | ≤ 0.3% | ≤ 0.5% |
| Water insolubles | ≤ 0.05% | ≤ 0.10% |
| Iron (Fe) | ≤ 10 ppm | ≤ 20 ppm |
| Chloride (Cl) | ≤ 50 ppm | ≤ 100 ppm |
| Calcium + Magnesium | ≤ 200 ppm | ≤ 400 ppm |
| pH (5% aq. soln.) | 6.5–7.5 | 6.0–8.0 |
Procurement tip: Always request the certificate of analysis (COA) and ensure the supplier uses washing and drying processes that minimize residual mother liquor—the main source of chlorides. Our anhydrous sodium sulfate is produced via a robust evaporation and crystallization route, resulting in a product that not only meets but often significantly undercuts these impurity limits.
In the production of synthetic laundry detergents, sodium sulfate serves as an inert filler that allows formulators to standardize active surfactant concentration. Because it is compatible with anionic surfactants and does not affect the detergent’s alkalinity profile, it is used at levels up to 40% by weight in some powder formulations. The anhydrous grade helps prevent caking in detergent packs and aids in achieving a uniform particle size distribution. Here again, low iron content is vital to avoid staining of fabrics.
In the glass industry, sodium sulfate acts as a fining agent, added to the batch to help release small gas bubbles during the melt. It also functions as an oxidizer to maintain the redox balance in amber and flint glass. However, glassmakers must be aware that sodium sulfate is not a source of nickel sulfide inclusions. Nickel sulphide in glass—a critical concern for tempered glass—originates from nickel-bearing contaminants in cullet or raw materials, not from the sulfate batch component. When sourcing sodium sulfate for glass, the key parameter is consistent particle size to avoid segregation in the batch house, along with low levels of heavy metals that could discolor the melt.
Textile mills employ sodium sulfate as a leveling agent in direct, sulfur, and reactive dyeing. By moderating the rate of dye exhaustion, it ensures even color uptake on cellulosic fibers like cotton and rayon. A consistent, fine crystalline structure—like Hailei’s product—dissolves quickly in dye baths, reducing processing time and preventing particulate deposits on fabric. The near-neutral pH protects sensitive dyes and fabrics from hydrolytic attack.
Sodium sulfate is a precursor for the production of sodium sulfide, sodium silicate, and ultramarine pigments. In these downstream syntheses, high purity reduces unwanted side reactions and increases the yield of the target compound. Our customers in the chemical sector value the batch-to-batch consistency that Hailei delivers, supported by rigorous process control and third-party laboratory testing.
You may be surprised to find an industrial chemical in your bathroom, but what is sodium sulfate in shampoo? In cosmetic formulations, sodium sulfate—often as part of a blend in shampoos, body washes, and toothpaste—primarily functions as a viscosity builder. It helps thicken the product by promoting the arrangement of surfactant micelles, giving the desired pour behavior and sensory feel. It is chemically inert, non-toxic, and approved by regulatory bodies for use in rinse-off products. While the cosmetic grade requires ultra-high purity and often undergoes additional purification, the fundamental sodium sulfate molecule is identical to the industrial grade. Hailei does not supply the cosmetic market directly, but many of our buyers in the detergent and surfactant manufacturing sectors use anhydrous sodium sulfate as a precursor to producing sodium lauryl sulfate (SLS) and sodium lauryl ether sulfate (SLES)—the true cleansing workhorses in shampoos.
For buyers in South Asia, the sodium sulphate price in Pakistan is influenced by a combination of regional dynamics and global benchmarks. Pakistan is a significant importer of this commodity, relying on Chinese and Indian supply. Key pricing factors include:
While we do not publish spot prices due to market volatility, Hailei Fine Chemical is known for offering some of the most competitive FOB/CIF quotations to Pakistani buyers. We ship 1,000–25,000 kg lots in 25 kg or 1,000 kg PP/PE bags, and we can arrange containerized or break-bulk deliveries. For an up-to-date custom quotation, simply provide your required spec, monthly tonnage, and preferred port of discharge.
With over two decades of production and export experience, Weifang Hailei Fine Chemical Co., Ltd. has established itself as a trusted partner for industrial chemical procurement. Here is what sets us apart when you search for sodium sulfate for sale:
Store anhydrous sodium sulfate in a cool, dry, well-ventilated area away from moisture. Although it is not highly hygroscopic, prolonged exposure to high humidity can cause surface caking. Keep containers sealed when not in use.
Sodium sulfate is not classified as dangerous under GHS or major transport regulations. It can cause mild eye or respiratory irritation as a fine dust, so use appropriate dust control and personal protective equipment (PPE).
We typically accept orders starting from one 20-foot container (20–28 metric tons), but we can accommodate smaller trial orders. Contact our sales team for options.
If stored properly, anhydrous sodium sulfate has an indefinite shelf life. It does not decompose or degrade under normal storage conditions.
Whether your operation is a kraft paper mill tightening its chemical recovery efficiency, a detergent formulator needing reliable filler, or a glass manufacturer optimizing melt quality, the right sodium sulfate source makes all the difference. At Hailei Fine Chemical, we don’t just offer sodium sulfate for sale—we deliver a partnership in quality, consistency, and industrial expertise.
Explore the full specifications, request the latest COA, and discuss your supply needs by visiting our Sodium Sulphate product page. For a personalized quote tailored to your volume and shipping requirements, get a quote today and let our team demonstrate why leading buyers trust Hailei as their chemical backbone.
Procurement managers and chemical engineers in the pulp and paper industry know that not all sodium sulfate for sale meets the strict specifications required for the kraft process. As a leading exporter from China, Weifang Hailei Fine Chemical Co., Ltd. provides high-purity anhydrous sodium sulfate (Na2SO4) that consistently delivers in this demanding application. Unlike generic commodity supplies, our 99% pure product is engineered to minimize iron carryover, reduce scaling in recovery boilers, and ensure a stable chemical balance in the pulping cycle. Whether you operate a kraft mill in Pakistan, a detergent plant in the Middle East, or a glass factory in Europe, understanding the chemical properties and supply chain dynamics can make the difference between smooth operations and costly downtime. In this article, we explore the pivotal role of sodium sulfate in kraft pulping, unpack the key quality parameters, and broaden the view to its use in detergents, glass, textiles, and even personal care products like shampoo.
The kraft (sulfate) process remains the dominant method for producing strong, high-quality paper from wood chips. Central to this process is the recovery of pulping chemicals—sodium hydroxide and sodium sulfide—from the spent black liquor. As the black liquor is combusted in the recovery boiler, the organic matter burns off, leaving a smelt of sodium carbonate and sodium sulfide. This smelt is dissolved to form green liquor, which is then causticized with lime to regenerate white liquor for cooking. During this intensive cycle, small but unavoidable losses of sodium and sulfur occur, primarily through residual chemicals in the washed pulp and through emissions.
Here is where sodium sulfate anhydrous enters as the critical makeup chemical. Added directly to the black liquor before it enters the recovery boiler, the sulfate ion is reduced to sulfide in the high-temperature, reducing atmosphere of the boiler char bed. This reaction replenishes both the sodium and sulfide inventory of the cooking liquor, maintaining the sulfidity level necessary for efficient delignification and fiber strength. Without a consistent, high-quality source of sodium sulfate, the entire chemical equilibrium of the mill is disrupted, leading to higher consumption of caustic soda, reduced pulp yield, and elevated operating costs.
Impurities in makeup sodium sulfate can have outsized consequences. Chlorides, for example, lower the melting point of the smelt and can accelerate corrosion of boiler tubes. Iron, even at trace levels, can catalyze cellulose degradation during the cook and end up in the final pulp, affecting brightness and bleaching chemical demand. This is why mills that truly optimize their chemical balance demand sodium sulfate with iron content below 20 ppm and chloride below 100 ppm—specifications that Hailei Fine Chemical exceeds with routine 99% purity material.
To appreciate its versatility, one must first understand the sodium sulfate chemical properties. Sodium sulfate (Na2SO4) exists mainly in two forms: the decahydrate (Glauber’s salt, Na2SO4·10H2O) and the anhydrous form. For industrial applications like kraft pulping, detergent manufacturing, and glass production, the anhydrous grade is preferred because of its higher sodium sulfate content, lower freight costs, and non-caking behavior.
| Property | Value (Anhydrous) |
|---|---|
| Molecular Formula | Na2SO4 |
| Molar Mass | 142.04 g/mol |
| Appearance | White crystalline powder |
| Density | 2.664 g/cmÂł |
| Melting Point | 884 °C |
| Solubility in Water | Approx. 4.76 g/100 mL at 0 °C; 42.7 g/100 mL at 100 °C (unusual retrograde solubility above ~32 °C) |
| pH (5% solution) | 6–8 |
| Hygroscopic Nature | Low; resists caking in ambient conditions |
The retrograde solubility curve—where solubility decreases slightly with temperature above about 32 °C—is important in crystallizer design for sodium sulfate recovery. For the industrial buyer, the low hygroscopicity of the anhydrous form means it stays flowable in silos and big bags, a practical advantage in bulk handling.
Not every lot of sodium sulfate for sale is equal. Kraft mills, particularly those producing bleached grades for paper and board, require a tightly controlled feedstock. The following table reflects the typical specification sheet of Hailei’s high-purity anhydrous sodium sulfate, which surpasses the minimum requirements of most end-users.
| Parameter | Hailei Typical Value | Typical Industrial Requirement |
|---|---|---|
| Na₂SO₄ purity | ≥ 99.0% | ≥ 97.5% |
| Moisture | ≤ 0.3% | ≤ 0.5% |
| Water insolubles | ≤ 0.05% | ≤ 0.10% |
| Iron (Fe) | ≤ 10 ppm | ≤ 20 ppm |
| Chloride (Cl) | ≤ 50 ppm | ≤ 100 ppm |
| Calcium + Magnesium | ≤ 200 ppm | ≤ 400 ppm |
| pH (5% aq. soln.) | 6.5–7.5 | 6.0–8.0 |
Procurement tip: Always request the certificate of analysis (COA) and ensure the supplier uses washing and drying processes that minimize residual mother liquor—the main source of chlorides. Our anhydrous sodium sulfate is produced via a robust evaporation and crystallization route, resulting in a product that not only meets but often significantly undercuts these impurity limits.
In the production of synthetic laundry detergents, sodium sulfate serves as an inert filler that allows formulators to standardize active surfactant concentration. Because it is compatible with anionic surfactants and does not affect the detergent’s alkalinity profile, it is used at levels up to 40% by weight in some powder formulations. The anhydrous grade helps prevent caking in detergent packs and aids in achieving a uniform particle size distribution. Here again, low iron content is vital to avoid staining of fabrics.
In the glass industry, sodium sulfate acts as a fining agent, added to the batch to help release small gas bubbles during the melt. It also functions as an oxidizer to maintain the redox balance in amber and flint glass. However, glassmakers must be aware that sodium sulfate is not a source of nickel sulfide inclusions. Nickel sulphide in glass—a critical concern for tempered glass—originates from nickel-bearing contaminants in cullet or raw materials, not from the sulfate batch component. When sourcing sodium sulfate for glass, the key parameter is consistent particle size to avoid segregation in the batch house, along with low levels of heavy metals that could discolor the melt.
Textile mills employ sodium sulfate as a leveling agent in direct, sulfur, and reactive dyeing. By moderating the rate of dye exhaustion, it ensures even color uptake on cellulosic fibers like cotton and rayon. A consistent, fine crystalline structure—like Hailei’s product—dissolves quickly in dye baths, reducing processing time and preventing particulate deposits on fabric. The near-neutral pH protects sensitive dyes and fabrics from hydrolytic attack.
Sodium sulfate is a precursor for the production of sodium sulfide, sodium silicate, and ultramarine pigments. In these downstream syntheses, high purity reduces unwanted side reactions and increases the yield of the target compound. Our customers in the chemical sector value the batch-to-batch consistency that Hailei delivers, supported by rigorous process control and third-party laboratory testing.
You may be surprised to find an industrial chemical in your bathroom, but what is sodium sulfate in shampoo? In cosmetic formulations, sodium sulfate—often as part of a blend in shampoos, body washes, and toothpaste—primarily functions as a viscosity builder. It helps thicken the product by promoting the arrangement of surfactant micelles, giving the desired pour behavior and sensory feel. It is chemically inert, non-toxic, and approved by regulatory bodies for use in rinse-off products. While the cosmetic grade requires ultra-high purity and often undergoes additional purification, the fundamental sodium sulfate molecule is identical to the industrial grade. Hailei does not supply the cosmetic market directly, but many of our buyers in the detergent and surfactant manufacturing sectors use anhydrous sodium sulfate as a precursor to producing sodium lauryl sulfate (SLS) and sodium lauryl ether sulfate (SLES)—the true cleansing workhorses in shampoos.
For buyers in South Asia, the sodium sulphate price in Pakistan is influenced by a combination of regional dynamics and global benchmarks. Pakistan is a significant importer of this commodity, relying on Chinese and Indian supply. Key pricing factors include:
While we do not publish spot prices due to market volatility, Hailei Fine Chemical is known for offering some of the most competitive FOB/CIF quotations to Pakistani buyers. We ship 1,000–25,000 kg lots in 25 kg or 1,000 kg PP/PE bags, and we can arrange containerized or break-bulk deliveries. For an up-to-date custom quotation, simply provide your required spec, monthly tonnage, and preferred port of discharge.
With over two decades of production and export experience, Weifang Hailei Fine Chemical Co., Ltd. has established itself as a trusted partner for industrial chemical procurement. Here is what sets us apart when you search for sodium sulfate for sale:
Store anhydrous sodium sulfate in a cool, dry, well-ventilated area away from moisture. Although it is not highly hygroscopic, prolonged exposure to high humidity can cause surface caking. Keep containers sealed when not in use.
Sodium sulfate is not classified as dangerous under GHS or major transport regulations. It can cause mild eye or respiratory irritation as a fine dust, so use appropriate dust control and personal protective equipment (PPE).
We typically accept orders starting from one 20-foot container (20–28 metric tons), but we can accommodate smaller trial orders. Contact our sales team for options.
If stored properly, anhydrous sodium sulfate has an indefinite shelf life. It does not decompose or degrade under normal storage conditions.
Whether your operation is a kraft paper mill tightening its chemical recovery efficiency, a detergent formulator needing reliable filler, or a glass manufacturer optimizing melt quality, the right sodium sulfate source makes all the difference. At Hailei Fine Chemical, we don’t just offer sodium sulfate for sale—we deliver a partnership in quality, consistency, and industrial expertise.
Explore the full specifications, request the latest COA, and discuss your supply needs by visiting our Sodium Sulphate product page. For a personalized quote tailored to your volume and shipping requirements, get a quote today and let our team demonstrate why leading buyers trust Hailei as their chemical backbone.