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EF/EMCI Logo Attribute: CASRN


Definition:

The Chemical Abstracts Service (CAS) Registry Number (CASRN) is a unique number assigned by CAS to each distinct chemical substance recorded in the CAS Chemical Registry System. CASRN is stored as a 9-digit alphanumeric field with leading zeros. The output display is in the format zzzznn-nn-n with suppression of leading zeros. Each CASRN is processed through a check-digit algorithm to determine validity. The CASRN data field is blank if not known.

Definition Source:

Functional Design for the Envirofacts Master Chemical Integrator, September 1994.

Properties: Basic Text

Range: 000050000 - 999999999

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