30 CFR § 14.8
Applicants granted an approval or an extension of approval under
this Part must:
(a) In order to assure that the finished conveyor belt will meet
the flame-resistance test--
(1) Flame test a sample of each batch, lot, or slab of conveyor
(2) Flame test or inspect a sample of each batch or lot of the
materials that contribute to the flame-resistance characteristic.
(b) Calibrate instruments used for the inspection and testing in
paragraph (a) of this section according to the instrument
manufacturer's specifications. Instruments must be calibrated using
standards set by the National Institute of Standards and Technology,
U.S. Department of Commerce or other nationally or internationally
recognized standards. The instruments used must be accurate to at least
one significant figure beyond the desired accuracy.
(c) Control production so that the conveyor belt is manufactured in
accordance with the approval document. If a third party is assembling
or manufacturing all or part of an approved belt, the approval holder
shall assure that the product is manufactured as approved.
(d) Immediately notify the MSHA Approval and Certification Center
of any information that a conveyor belt has been distributed that does
not meet the specifications of the approval. This notification must
include a description of the nature and extent of the problem, the
locations where the conveyor belt has been distributed, and the
approval holder's plans for corrective action.