This is what a buyer checks before they shortlist a chemicals and materials supplier.
What does a laboratory check before ordering a reagent from a new supplier?
They check the grade against the method, the impurity specification against what their analysis can tolerate, and whether a certificate of analysis comes with every batch. In validated work a reagent without documented purity cannot be used, whatever it costs.
A laboratory manager is deciding whether a cheaper reagent can be used in a method that has already been validated.
Reviewed 4 August 2026 · Written for laboratory chemical suppliers selling to business buyers
What does a laboratory check before ordering a reagent from a new supplier?
What a buyer needs to identify the product
These are the fields a buyer scans before deciding whether you are worth contacting. Missing one of them usually ends the visit without an email.
- 1
Product name, CAS number and formula
The unambiguous identity of what is being ordered.
- 2
Grade
Analytical reagent, HPLC, spectroscopy and technical grades are different products.
- 3
Purity and impurity specification
What the method can tolerate.
- 4
Pack sizes
Laboratories buy small and repeatedly.
- 5
Storage and stability conditions
Determines shelf life in the lab.
- 6
Hazard classification
Decides what the lab is permitted to hold.
- 7
Lead time and stock position
Laboratories order against a schedule, not a forecast.
The documents buyers ask for
Not all of them belong on a public page. Naming the ones you can issue is what separates a supplier who can be audited from one who cannot.
| Document | What it proves | Where it belongs |
|---|---|---|
| Certificate of AnalysisAsked at: with every batch, without asking | Batch purity and impurity profile against the specification | Per shipment |
| Safety Data SheetAsked at: before purchase approval | Hazard, handling, storage and disposal information | Publish it |
| Product specification sheetAsked at: method selection | The grade's guaranteed limits, separate from the batch result | Publish it |
| ISO 9001 or ISO 17025 scopeAsked at: supplier approval | Quality system, and accredited testing scope where claimed | Publish it |
| Traceability statementAsked at: validated and regulated work | Whether values are traceable to a recognised reference material | Name it, share on request |
| Transport classificationAsked at: ordering | How the material can be shipped and received | Publish it |
| Manufacturing or repacking declarationAsked at: supplier assessment | Whether you synthesise, purify or repack | Publish it |
Where laboratory chemicals sites lose the enquiry
Each of these is common, cheap to fix, and costs an enquiry that never arrives — so nobody ever reports it.
Certificate of analysis available only on request
In a laboratory the certificate is part of the product. Making it a separate request adds a step to every order and signals that the batch data may not always exist.
Grade named without an impurity specification
"Analytical grade" is not a specification. Without limits the buyer cannot tell whether it will pass their method validation.
No statement of whether you manufacture or repack
Laboratories repeating a validated method need to know if the source can change underneath them. Silence is read as repacking.
What the enquiry form should ask
A form that collects these can be answered properly the first time. A form that collects a name and a message cannot.
Enquiry form — laboratory chemicals
Enough to reply usefully, short enough that a buyer finishes it.
- Product and CAS number
- Removes all ambiguity.
- Grade required
- Determines whether you can supply at all.
- Pack size and quantity
- Laboratory quantities are small and specific.
- Application or method
- Lets you flag a grade mismatch before it costs the customer a run.
- Documentation required
- Certificate of analysis, traceability or both.
- Delivery timing
- Laboratory work is scheduled and a late reagent stops it.
Questions suppliers ask
Should certificates of analysis be searchable by batch number online?
If you can do it, it is the single most useful thing you can build. Laboratories file certificates against results and frequently need to retrieve one years later. A batch lookup removes an email exchange that both sides find tedious and that you cannot always answer quickly.
How much of the specification should be public?
All of the grade specification. It is what a laboratory compares between suppliers, and hiding it only guarantees they compare someone else's. Batch certificates are different: those belong to the customer who bought the batch.
We repack rather than synthesise. Does that matter?
It matters and it should be stated. Some laboratories cannot use repacked material in validated methods; others do not care and value your stock position and pack sizes. Both need to know which you are, and finding out late is worse for you than for them.
Documents and standards named here are the ones buyers in this industry commonly ask for; requirements vary by market, customer and contract, so treat this as a starting checklist rather than a compliance list. Clearer pages can help discovery and evaluation. They do not guarantee rankings, AI citations, enquiries or revenue.
Illustrative
An enquiry from this search looks like: Product and CAS number · Pack size and quantity · Delivery timing · Grade required
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