Is a CAS number the same as a product code?

No. A CAS number identifies the chemical substance, while a supplier product code is an internal catalogue reference. The CAS number is the more reliable identifier for specification matching.

Can two different products share the same CAS number?

No. Each CAS Registry Number is unique to one substance record. If two quotations show the same CAS number, the intended compound should be identical.

Do I need a CAS number to request a quote?

It is recommended. Sharing the CAS number with quantity, purity and packaging requirements helps the supplier respond with a more accurate quotation.

What Is a CAS Number and Why It Matters in Chemical Procurement

How a CAS Registry Number works

CAS numbers use a three-part hyphenated format, such as 4964-71-0. The number does not encode molecular structure; it points to a specific substance record in the CAS registry.

CAS numbers remove ambiguity between names and synonyms
The same compound can have many trade names but only one CAS number
CAS search is the fastest way to verify the exact product you want to buy

Why CAS verification matters in procurement

Buyers use CAS numbers to compare quotations, review certificates of analysis and confirm regulatory documents. A mismatch between the product name and the CAS number can lead to the wrong intermediate reaching the pilot plant or production line.

Searching by CAS on malongchemicals.com

Enter the CAS number in the search bar and the site will take you directly to the matching product page. There you can check formula, molecular weight, purity and application notes before sending an inquiry.

Representative products

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