CFR›Title 30›Chapter I›Part 57›Subpart E›Subject Group General Requirements—Surface and Underground ContainsSections 57.6900–57.6905CorpusDaily eCFRDisplayed edition2026-06-25Last updated2026-06-25 Sections 57.6900 § 57.6900 Damaged or deteriorated explosive material. 57.6901 § 57.6901 Black powder. 57.6902 § 57.6902 Excessive temperatures. 57.6903 § 57.6903 Burning explosive material. 57.6904 § 57.6904 Smoking and open flames. 57.6905 § 57.6905 Protection of explosive material. Previous Extraneous Electricity—Surface and Underground Extraneous Electricity—Surface and Underground Next General Requirements—Underground Only General Requirements—Underground Only