Leather substrate
Leather substrate means a nonputrescible leather surface intended for the application of finishing chemicals and materials. The leather substrate may be a continuous piece of material such as side leather or may be a combination of smaller leather pieces and leather fibers, which when joined together, form an integral composite leather material.
Source
40 CFR § 63.5460
Scoping language
Terms used in this subpart are defined in the Clean Air Act, 63.2, and in this section as follows: