What a catalog number identifies
A catalog number, often written as Cat. No., identifies an entry in a supplier’s catalog. Read it together with the product name and stated configuration. Different suppliers may use different codes for a similarly named material, so the code alone cannot establish that two offers are equivalent.
Catalog number vs lot number
A catalog number identifies a catalog entry; a lot or batch number identifies a particular production or packaging batch. One catalog entry can be supplied from different lots. A matching catalog number therefore does not establish that a report covers the material offered. Compare the lot on the label and the corresponding document.
Catalog number, SKU and CAS number
A SKU is an inventory reference and may differ from the public catalog number. A CAS Registry Number, where applicable, identifies a substance record rather than a supplier’s package or batch. Keep these fields separate and ask the supplier to explain an unfamiliar or missing identifier.
Read the specification alongside the code
Compare the exact material name, stated form, amount and number of containers. Do not infer a package quantity or chemical form from a code suffix. If the listing and quotation disagree, request written confirmation of the intended configuration before relying on either record.
Match the code from quote to receipt
Compare the displayed catalog number on the listing, quotation, order confirmation, packing record and label. Compare it with the COA when that field is provided. Preserve meaningful spaces, hyphens and leading zeros. If a document does not show the catalog number, ask how it is linked to the exact item and lot.
Check a changed or discontinued code
If a supplier replaces a code, ask for the old-to-new reference and an explanation of whether the material or package changed. Keep the original code in your records. A similar name is not sufficient reason to treat a replacement item as equivalent.
A quick catalog-number check
Use these five checks when comparing a listing with a quote or label. Record any discrepancy and the supplier’s answer before completing your review.
- The product name and stated form agree.
- The catalog number identifies the intended entry.
- The amount and package quantity are written out and agree.
- The lot number is recorded separately when reviewing a batch document.
- Any changed or missing identifier has a written explanation.
Catalog numbers help connect records. They do not establish purity, availability, regulatory approval or suitability for a project; those questions require separate supporting information.