Diaminostilbenedisulfonic acid

Primary Chemical Name is the standard name assigned to a chemical substance.

Chemical Abstracts Service Registry Number is a unique identifier for a chemical and its synonyms. CAS numbers identify the chemical, but not its concentration or specific mixture.  CAS Registry Numbers are assigned by the Chemical Abstracts Service, a division of the American Chemical Society. For more information: www.cas.org

We have assigned "ID numbers" (with 6 leading zeros or nines, e.g., 000000-xx-x , 888888-xx-x) or 999999-xx-x) for blends and chemicals that do not have CAS numbers. 

The EC Number, formerly known as the EINECS number is a unique 7-digit number (format: xxx-xxx-x) assigned to chemicals registered with the European Chemicals Agency (ECHA).

Synonyms are alternative names that represent the same chemical substance.

SVHC is a substance (identified by the European Chemicals Agency) that may have serious and often irreversible effects on human health and the environment. SVHC are defined in Article 57 of Regulation (EC) No 1907/2006 (“the REACH Regulation”) and include substances which are:
1.  Carcinogenic, Mutagenic or toxic to Reproduction (CMR), meeting the criteria for classification in category 1 or 2 in accordance with Directive 67/548/EEC or in category 1a or 1b in accordance with EC No 1272/2008This directive was recently replaced by the new EU regulation (EC) No 1272/2008.
2.  Persistent, Bioaccumulative and Toxic (PBT) or very Persistent and very Bioaccumulative (vPvB) according to the criteria in Annex XIII of the REACH Regulation, or
3.  Identified, on a case-by-case basis, from scientific evidence as causing probable serious effects to human health or the environment of an equivalent level of concern as those above (e.g. endocrine disrupters).