1. Scope 1.1 This specification covers all standard types of wool and part-wool felt in the form of rolls and sheets that are suitable for mechanical use. Certain special-purpose felts are also covered. 1.2 This specification is not applicable to felt-like products that utilize weaving, knitting, stitching, or bonding such as papermakers felt. 1.3 Trade practice in the felt industry deals in pounds, yards, and inches, therefore the values stated in inch-pound units are to be regarded as standard. The values in SI units are provided as information only. 1.3.1 The specification referenced in 2.2 use only inch-pound units.