The CAS Registry Number of sodium lauryl sulfate is 151-21-3.
This one identifier covers the same molecule regardless of the name on the label. Sodium lauryl sulfate (SLS), sodium dodecyl sulfate (SDS) and K12 are synonyms for the same compound, so all of them are correctly ordered under CAS 151-21-3. The number also applies across physical forms and grades: 92% powder, needles, 30% liquid, and high-purity SDS 99% laboratory material.
One common sourcing error to avoid: SLES is not covered by this CAS number. Sodium laureth sulfate is a different, ethoxylated compound with CAS 68585-34-2. If your formulation or regulatory filing specifies CAS 151-21-3, make sure the offer you receive is for SLS/SDS, not SLES.
When requesting a quotation, including the CAS number together with the grade and form removes any ambiguity. See our SLS CAS 151-21-3 overview or contact our team for documentation.