MSHA - Code of Federal Regulations - 30 CFR 7.25
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MSHA - Title 30 CFR
30 CFR § 7.25
Critical characteristics.


A sample of each batch or lot of brattice cloth and ventilation tubing shall be flame tested or a sample of each batch or lot of the materials that contribute to the flame-resistance characteristic shall be inspected or tested to ensure that the finished product will meet the flame-resistance test.