When contacting a supplier for 20-mesh monosodium glutamate, specify the sieve method and acceptable particle-size distribution. Agree how the sample and commercial delivery will be evaluated, then connect those criteria to the purchase order. Confirm the proposed manufacturer and grade before requesting a representative sample.
Decide what the requested grade must achieve
Explain why your operation is requesting a coarse crystal format. The reason might concern a dosing step, appearance in a finished blend or compatibility with existing material. Record the actual buying question and the process where it will be evaluated. A mesh label is not a substitute for evidence that the material fits that operation.
Compare candidate particle sizes against the same application requirements. Keep visual references separate from measurable acceptance criteria: close-up photographs can show appearance, while sieve results describe the tested size distribution.
Write a specification that two parties can interpret consistently
Ask the proposed supplier to explain exactly what its “20 mesh” description means and to provide its available sieve data. Does it refer to a named sieve, a range, or a commercial grade designation? Do not convert an ambiguous reply into a precise requirement without agreement.
RETSCH's sieve-analysis guidance explains that elongated particles can pass through a sieve lengthwise. That is one reason visual crystal length and sieve results should not be treated as interchangeable. Agree the actual test conditions and reporting basis with the supplier and the laboratory or quality team responsible for acceptance.
| Specification field | What to agree | What should remain open until resolved |
|---|---|---|
| Grade identity | Manufacturer, product and the supplier's grade designation | Whether “20 mesh” describes the proposed material at all |
| Sieve references | Named sieve standard and openings used in the test | An unsupported mesh number without a defined reference |
| Reported fractions | How retained and passing material is reported | A result whose basis cannot be interpreted |
| Acceptance criteria | Buyer-approved limits for the relevant fractions | Any threshold not accepted by both parties |
| Method and preparation | Documented method, sample preparation and test conditions | Different procedures that prevent a fair comparison |
| Order linkage | Specification version and batch evidence required for release | A sample result offered as proof for an unidentified shipment |
Leave numerical tolerances to the parties who understand the application and the available material. Copying limits from another ingredient or choosing them from an attractive photograph creates a purchasing requirement without a demonstrated basis. Record which criteria are mandatory and which observations are for information.
Make the sample request answer a defined question
Ask whether a representative sample is available and how it would relate to the proposed supply. Record its identifier, claimed manufacturer and grade, source batch if provided, date received and condition on arrival. Agree how the sample will be divided or retained under your organisation's procedure so later reviewers know which material was evaluated.
Review the sample in the intended operation. Record the equipment, sequence and other conditions needed to interpret the observation, keeping them comparable when evaluating alternatives. If particle appearance is relevant, use consistent lighting and a stated scale in your own photographs, but keep those images as supporting observations. The acceptance decision should refer to the agreed specification and trial record.
Where buyer and supplier sieve results differ, first compare the sample identity, method, preparation and reporting basis. Document what remains unresolved and who will arrange the next check. Do not silently average incompatible results or replace the original specification after seeing the outcome.
Carry the approved criteria into the bagged order
Put the accepted grade description, sieve requirements and specification revision in the purchase order. Request the agreed batch documentation and identify which changes need written approval before dispatch. Confirm packaging independently: an accepted particle-size description does not establish bag construction or packing availability.
Confirm the 25 kg bag count, label details and receiving requirements separately from the particle specification. If the order contains several batches, agree whether each needs separate evidence and how the quantities will be identified on the packing list.
Keep the first order traceable to the approval
At receipt, connect the delivery labels and documents to the approved specification and sample record. Apply the agreed receiving and release procedure, recording any deviation before material is released for its intended use. Feed actual production observations back to the specification owner so a future order uses a controlled revision rather than an informal memory of the first trial.