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Today's Terms
Backnailing
Definition:
In roofing, the practice of blind nailing (in addition to hot- mopping) all the plies to a substrate to prevent slippage on slopes of 1-1/2 inch or more for steep asphalt, 1/2 inch or more for coal-tar pitch and dead-level asphalt.
Acetone
Definition:
A water-white volatile, highly flammable solvent with ether-like odor; made by destructive distillation of hardwood, fermentation of butyl alcohol, and from petroleum sources; used extensively in making paint removers; dimethyl ketone; s
Acute Exposure
Definition:
A single exposure to a toxic substance, which results in severe biological harm or death. Acute exposures are usually characterized as lasting no longer than a day, as compared to longer, continuing exposure over a period of time.
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