30 CFR § 7.22
The following definitions apply in this subpart:
A curtain of jute, plastic, or similar material used
to control or direct ventilating air.
A unit of yarn size indicating the fineness of fiber of
material based on the number of grams in a length of 9,000 meters.
A sheet of flexible material applied to a scrim by pressure,
temperature, adhesion, or other method.
A substrate material of plastic or fabric laminated between or
coated with a film.
Rigid or flexible tubing used to convey