{"operation":"document","citation":"13-0003","title":"Air Liquide USA LLC — Hazardous Materials Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"2013-03-08","effective_on":null,"summary":"13-0003 response to Air Liquide USA LLC concerning 172.202, 172.402.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-13-0003.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-13-0003.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-13-0003","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/docs/standards-rulemaking/hazmat/interpretations/74156/130003.pdf","body":"<<>>\n\nU.S. Department of Transportation\nPipeline and Hazardous Materials\nSafety Administration\n1200 New Jersey Avenue, SE\nWashington, DC 20590\nMAR 0 8 2013\nMr. Jerry W. Freeman\nDirector, Transportation Compliance\nAir Liquide USA LLC\n2700 Post Oak Boulevard, Suite 1800\nHouston, TX 77056\nReference No. 13-0003\nDear Mr. Freeman:\nThis is in response to your December 3, 2012 letter requesting clarification on the proper\nclassification and shipping description of\"Trisilylamine\" (CAS No. 13862-16-3) under\nthe Hazardous Materials Regulations (HMR; 49 CPR Parts 171-180). You state this\nchemical is a liquid developed for use in the semiconductor industry. You also state the\nmaterial was tested in conformance with the hazardous material classification criteria\nprescribed in the HMR and determined to meet the following four hazard classes in order\nof precedence:\n• Division 6.1 (poisonous), Packing Group (PG) I, Hazard Zone B;\n• Division 4.3 (dangerous when wet), PG I;\n• Class 8 (corrosive, dermal), PG I;\n• Class 3 (flammable liquid), PG II.\nYou ask if the proper shipping description \"UN 3491, Toxic by inhalation, liquid, water-\nreactive, flammable, n.o.s. (Trisilylamine), 6.1, (4.3, 3), PGI, Zone B\" is the most\nappropriate selection for shipping this material throughout the United States and\ninternationally.\nThe answer is yes. However, for transport within the United States in accordance with the\nHMR, § 172.402(a)(2) requires all hazardous materials with a Class 8, PG I, subsidiary\nhazard to be labeled with a subsidiary CORROSIVE hazard warning label in all modes of\ntransport. Therefore, the subsidiary hazard class must be entered in the proper shipping\ndescription as well (see § 172.202(a)(3)).\nI hope this satisfies your request.\nSincerely,\n---Y r#~~cd::----\nT. Glenn Foster\nChief, Regulatory Review and Reinvention Branch\nStandards and Rulemaking Division\n\n<<>>\n\nf.clmon so Y1\n.§172 ,Jo 1\n~ f73.2a.,\nDecember 3, 2012\nCertified Return- Receipt\nU.S. Department of Transportation\nStandards & Rulemaking Division- East Building\nPipeline Hazardous Materials Safety Administration\nAttn: Mr. Charles E. Betts (PHH-10)\n1200 New Jersey Avenue, SE\nWashington DC 20590-0001\n~/tlS~,:ficahoj/1\n13 -oog\nDear Mr. Betts,\nI am writing your office to request a formal letter of guidance and interpretation on the classification of Trisilylamine\n(TSA) [N(SiH 3h, CAS # 13862-16-3] that is processed by Air Liquide. TSA is a chemical substance developed for\napplications in the semiconductor industry, and has recent.y undergone a series of analytical and scientific tests to\ndetermine certain characteristics. These tests were conducted by various independent and specialized certified\ntesting agencies over the course ofthe last several months. The results of these tests have revealed that TSA exhibits\nthe following characteristics as defined by the classification criteria outlined in 49 CFR Subpart D of Part 173:\n• Hazard Class Division 6.1: Toxic by Inhalation (Inhalation Hazard Zone B), PG I\n• :· Hazarct'C:Iass··ofvi$icifi 4.3: 'Water Reactive, PG 1\n• 'Haz'ard Cic\\s\"s 8: Corrosive (Dermal), PG I\n• l-la.zard Class 3: Flammable Liquid, PG II\nBased on 49·CFR §173.2a, Precedence of Hazard Table, available and appropriate D.O.T. Basic Descriptions' found in\n49 CFR §172.101 (Hazardous Materials Table), Air Liquide has selected 'UN3491, Toxic by inhalation liquid, water-\nreactive, flammable n.o.s. (Trisilylamine)' for identifying TSA for shipments offered throughout the United States and\ninternational community,\nCorrespondence with the US DOT Hazardous Materials Information Center and other professional and technical\nleaders within our industry concur with our decision. However, this description excludes the corrosive characteristics\nof TS/\\. 1\\,;r Liqulde 2nd its partners are seeking regulatory guidance and interpretation from your office on the proper\n:::lassification of TSA based on the current regulations of Title 49 CFR (Revised as of October 1, 2012).\nAir Liquide is committed to the safe and compliant transportation of hazardous materials. Should you have any\nquestions or require fu.rther information, please do not hesitate to contact me directly at 713.624.8213 or by email at\njerry.freeman@airliquide.com\nRespectfully, ,_ , . · ·. · :0\nflnr )'{~i!-\"'\"'\"'-n\n,. \\. 'J:-:: -: \\.; ·. ' .:· ::• ' ·.· •:\n\"Jerri; w: Freeman ~ ::.·•.•.•):-~ · ~· :)~'-·\" ·\nDirector,.Tran~portation·cornpna·nce•\nAir Liquide USA iLG\nAIR UQUIDE USA LLC • 2700 Post Oak Boulevard, Suite 1800, Houston,TX 77056\nAir Liquide (usR-