MSHA - Code of Federal Regulations - 30 CFR 75.1101-18
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MSHA - Title 30 CFR
30 CFR § 75.1101-18
Dry powder requirements.


Each dry powder chemical system shall contain the following minimum amounts of multipurpose dry powder: 
                -----------------------+--------------------
                        Belt           | Dry powder, pounds
                -----------------------+--------------------
                 Fire resistant........|       125
                 Non-fire resistant....|       250
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