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Unformatted text preview: M Page 13 emergency and first aid procedures;
the date of preparation or, if revised, the date of the revision; and
the manufacturer’s name and address. An MSDS is divided into sections, which discuss the OSHA-required topics listed
above. Typical names of the sections: Product identification, Hazardous components,
Physical data, Health hazard information, Fire and explosion hazard data, Reactivity
data, Protective equipment to be used, Spill or leak procedures, Special information,
Other precautions, and Comments. The order of the sections and their content vary
with the manufacturer. Some manufacturers of hazardous chemicals use an MSDS format prescribed by the American National Standards Institute (ANSI), known as ANSI
Z400.1, which is a voluntary standard. Other manufacturers prefer different formats. Understanding an MSDS
As you attempt to read and understand an MSDS, you may find these comments
helpful. The terminology below is used in many MSDSs. Reading the descriptions can
help you understand MSDSs.
CAS registry number. The ACS Chemical Abstracts Service (CAS) assigns a unique
number to each known, discovered, or synthesized chemical, called the CAS registry
Ceiling limit. Some very hazardous chemicals are characterized by a ceiling limit in
addition to a permissible exposure limit (PEL) or threshold limit value (TLV) (see
below). The ceiling limit is a concentration in parts per million (ppm) or milligrams
per cubic meter (mg/m3) that must not be exceeded in a specified time period, typically 15 minutes.
Chemical name. Usually, the International Union of Pure and Applied Chemistry
(IUPAC) or CAS chemical name is given, but a trade or common name for the
chemical may be given instead (e.g., “ethylene glycol” is acceptable instead of the
IUPAC name, “1,2-ethanediol”).
Composition of mixtures. This includes all hazardous components present in concentrations greater than 1% and all carcinogens in concentrations greater than 0.1%.
Control measures. Lists types of protective clothing, gloves, and respiratory p...
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- Spring '07