CFR›Title 40›Chapter I›Part 355›Subpart A ContainsSections 355.1–355.3CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 Subpart A—General Information Sections 355.1 § 355.1 What is the purpose of this part? 355.2 § 355.2 Who do “you,” “I,” and “your” refer to in this part? 355.3 § 355.3 Which section contains the definitions of the key words used in this part? Next Appendix A to Part 355 Appendix A to Part 355—The List of Extremely Hazardous Substances and Their Threshold Planning Quantities