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Office of Environmental Health & Safety

Material Safety Data Sheets
Technical Information: Guide Quick Reference Sheet


Number Title	Title Acronym	Origin	Definition	Number Format
Chemical Abstract Services Number	CAS Number or CASN	USA	Unique identification number given to a chemical.	XXXXX-XX-X
European Inventory of Existing Commercial Chemical Substances Number	EINECS	European	European chemical substances inventory reference number	XXX-XXX-X
European Community Number	EC	European	index number	XXX-XXX-XX-X
International Chemical Safety Cards Number	ICSC	International	The number of the ICS card for a particular substance.	XXXX
Registry of Toxic Effects of Chemical Substances Number	RTECS	USA	Published by the National Institute of Occupational Health and Safety (NIOSH) and is a great source of toxicological information	AAxxxxxxx
United Nations Number	UN	International	United Nations Identification Number	XXXX
Other Important Reference Numbers
Superfund Amendments and Reauthorization Act (SARA) 313	SARA 313	USA	The United States Environmental Protection Agency establishes this number, which refers to a specific chemical category.	NXXX
Annex I Index Number		European	Represents the atomic number of the most characteristic property of the substance.	XXX-XXX-XX-X