CFR›Title 46›Chapter I›Part 151›Subpart 151.56 ContainsSection 151.56-1CorpusDaily eCFRDisplayed edition2026-09-25Last updated2026-09-25 Subpart 151.56—Prohibited Materials of Construction Sections 151.56-1 § 151.56-1 Prohibited materials. Previous 151.55 Subpart 151.55—Special Requirements for Materials of Construction Next 151.58 Subpart 151.58—Required Materials of Construction