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MSHA - Title 30 CFR
30 CFR § 14.5

Test samples.

    Upon request by MSHA, the applicant must submit 3 precut, unrolled, flat conveyor belt samples for flame testing. Each sample must be 60 ± 1/4 inches long (152.4 ± 0.6 cm) by 9 ± 1/8 inches (22.9 ± 0.3 cm) wide.