ACS is committed to helping combat the global COVID-19 pandemic with initiatives and free resources. Learn More

Glossary of Abbreviations and Acronyms

ACGIH American Conference of Governmental Industrial Hygienists
ATFSEG A Task Force for Safety Education Guidelines
ANSI American National Standards Institute
CAS Chemical Abstracts Service
CDC Centers for Disease Control and Prevention
CHP Chemical Hygiene Plan
EPA Environmental Protection Agency
FHSA Federal Hazardous Substances Act
GFCI Ground fault circuit interrupter
GHS Globally Harmonized System
IDLH Immediate danger to life or health
LD50 Lethal dose, 50%
M Molarity (concentration in moles per liter)
MSDS Material Safety Data Sheet
NFPA National Fire Protection Association
NIOSH National Institute for Occupational Safety and Health
OSHA Occupational Safety and Health Administration
PEL Permissible exposure limit
PPE Personal protective equipment
RAMP Recognize the hazards; assess the risks of the hazards; minimize the risks of the hazards; prepare for emergencies from uncontrolled hazards
SDS Safety Data Sheet
TLV Threshold limit value
TWA Time-weighted average
UNECE United Nations Economic Commission for Europe

Get Involved with Chemical Safety Initiatives

Engage with other members of the chemical safety community. Membership provides networking opportunities, access to career advancement tools, meeting discounts, and more.

Join the DivisionJoin ACSView All Benefits


Connect with Us

Email Safety Team