Environmental Health and Safety

MSDS Glossary

Decomposition
Breakdown of a material or substance by heat, chemical reaction, electrolysis, decay, or other processes into parts, elements, or simpler compounds.
Density
The mass (weight) per unit volume of a substance. Usually given in pounds per gallon or grams per milliliter. See also Specific Gravity.
Depressant
A substance that reduces a bodily functional activity or an instinctive desire, such as appetite.
Dermal
Relating to skin.
Dermal Toxicity
Adverse effects resulting from skin exposure to a substance.
Dike
A barrier constructed to control or confine hazardous substances and prevent them from entering sewers, ditches, streams, or other flowing waters.
DOT
U.S. Department of Transportation regulates transportation of chemicals and other substances.
Dry Chemical
A powdered fire-extinguishing agent usually composed of sodium bicarbonate, potassium bicarbonate, etc.

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