{"data":{"id":"us/49-cfr-appendix-d-to-part-180","jurisdiction":"us","citation":"49 CFR Appendix D to Part 180","heading":"Appendix D to Part 180—Hazardous Materials Corrosive to Tanks or Service Equipment","body":"This list contains materials identified either by proper shipping name in 49 CFR 172.101 or shipped under an “n.o.s.” shipping description that, under certain conditions, can corrode carbon steel tanks or service equipment at a rate that may reduce the design level of reliability and safety of the tank or equipment to an unsafe level before the next qualification. Materials identified on this list are considered corrosive to the tank or service equipment.\nWhile every effort was made to identify materials deemed corrosive to the tank or service equipment, owners and operators are cautioned that this list may not be inclusive. Tank car owners and operators are reminded of their duty to ensure that no in-service tank will deteriorate below the specified minimum thickness requirements in this subchapter. See § 180.509(f)(3). In addition, FRA states a tank car owner must designate an internal coating or lining appropriately based on its knowledge of the chemical and not rely simply on this list. Regarding future thickness tests, this list may also be modified based on an analysis of the test results by the car owner, the Department of Transportation, or the Association of American Railroads' Tank Car Committee.\nHazardous Materials Table Proper Shipping Names (See § 172.101)\nAcetic acid, glacial or Acetic acid solution\nAluminum chloride, solution\nArsenic acid, liquid\nArsenic acid, solid\nButyric acid\nFerric chloride, solution\nFertilizer ammoniating solution (Nitrogen fertilizer solution)\nFluoroboric acid\nFluorosilicic acid\nFormaldehyde, solutions, flammable\nFormaldehyde, solutions\nHydrobromic acid\nHydrochloric acid\nHydrochloric acid solution\nHydrofluoric acid and Sulfuric acid mixtures\nHydrofluoric acid\nHydrogen peroxide and peroxyacetic acid mixtures, stabilized\nHydrogen, peroxide, aqueous solutions\nHydrogen peroxide, stabilized or Hydrogen peroxide aqueous solutions, stabilized\nHypochlorite solutions\nNitric acid\nPhenyl phosphorus dichloride\nPhenyl phosphorus thiodichloride\nPhosphoric acid solution\nPhosphoric acid, solid\nPhosphorus trichloride (Phosphorus chloride)\nSodium chlorate\nSodium chlorate, aqueous solution\nSodium hydrosulfide\nSulfur, molten\nSulfuric acid\nSulfuric acid, fuming\nSulfuric acid, spent\nZinc chloride, anhydrous\nZinc chloride, solution\nMaterials Transported Under an “N.O.S.” Description\nBenzoic acid (Environmentally hazardous substance, liquid, n.o.s., (RQ 5,000 pounds)\nBisulphites, aqueous solution, n.o.s. (Ammonium bisulfide)\nBlack liquor (Corrosive liquids, n.o.s. (contains sulfuric acid))\nCalcium lignosulfonate (not regulated under this subchapter)\nHexanoic acid (Corrosive liquids, n.o.s. (contains hexanoic acid))\nLignin liquor (not regulated under this subchapter)\nLithium chloride (not regulated under this subchapter)\nSodium polyacrylate (not regulated under this subchapter)\nTitanium sulfate solution (Corrosive liquids, n.o.s. (contains sulfuric acid))\nWhite liquor (not regulated under this subchapter)","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER I—PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER C—HAZARDOUS MATERIALS REGULATIONS","PART 180—CONTINUING QUALIFICATION AND MAINTENANCE OF PACKAGINGS"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"bb4624dd7f3ef57492cc9ed75975f9100d0b6da2203d49c76a4d2699e468af59","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-appendix-c-to-part-180","next":"us/49-cfr-190.1"},"notice":"GroundRules: Original legal text. Not legal advice."}