Environmental Health and Safety

MSDS Glossary

Hand Protection
Specific type of gloves or other hand protection required to prevent harmful exposure to hazardous materials.
Hazardous Chemical
Any chemical whose presence or use is a physical hazard or health hazard.
Hazardous Warning
Words, pictures, or symbols, presented on a label to inform of the dangers of a chemical.
HCS
Hazard Communication Standard is an OSHA regulation issued under 29 CFR Part 1910.1200. Also known as HazCom or Right-to-Know.
Health Hazard
A chemical for which there is significant evidence, based on at least one study conducted in accordance with established scientific principles, that acute or chronic health effects may occur in exposed employees. The term "health hazard" includes chemicals that are carcinogens, toxic or highly toxic agents, reproductive toxins, irritants, corrosives, sensitizers, hepatotoxins, nephrotoxins, neurotoxins, agents that act on the hematopoietic system, and agents that damage the lungs, skin, eyes, or mucous membranes.
Highly Toxic
A chemical in any of the following categories:
  1. A chemical with a median lethal dose (LD50) of 50 milligrams or less per kilogram of body weight when administered orally to albino rats weighing between 200 and 300 grams each. (ORL-RAT LD50)
  2. A chemical with a median lethal dose (LD50) of 200 milligrams or less per kilogram of body weight when administered by continuous contact for 24 hours (or less if death occurs within 24 hours) with the bare skin of albino rabbits weighing between 2 and 3 kilograms each. (SKN-RBT LD50)
  3. A chemical that has a median lethal concentration (LC50) in air of 200 parts per million by volume or less of gas or vapor, or 2 milligrams per liter or less of mist, fume, or dust, when administered by continuous inhalation for 1 hour (or less if death occurs within 1 hour) to albino rats weighing between 200 and 300 grams each. (IHL-RAT LC50)
Hormones
Act as chemical messengers to body organs.

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