# Fluoro-Seal International — Hazardous Materials Safety Interpretation **Citation:** 07-0047 **Type / status:** guidance / guidance **Agency:** Pipeline and Hazardous Materials Safety Administration **Effective:** Not stated **Published:** 2007-03-26 07-0047 response to Fluoro-Seal International concerning 172.101, 172.102, 173.166. ## Document text <<>> U.S. Department of Transportation Washington, D.C. 20590 400 Seventh Street, S.W. Pipeline and Hazardous Materials Safety Administration MAR 26 2007 Mr. Paul J. Crook Ref. No. 07-0047 Safety & Environmental Manager Fluoro-Seal International Houston, Texas 77084 16360 Park Ten Place, Suite 325 Dear Mr. Crook: This responds to your February 20, 2007 letter requesting clarification on Special Provision 3 in §172.102 of the Hazardous Materials Regulations (HMR; 49 CFR Parts fluoride, anhydrous, UN 1052", is Hazard Zone B or Hazard Zone C. 171-180). Specifically, you ask whether the appropriate hazard zone for "Hydrogen As your letter indicates, the entry for "hydrogen fluoride, anhydrous, UN 1052" is assigned "Special Provision 3" in column 7 of the Hazardous Materials Table (HMT) in §172.101 of the HMR. Special Provision 3 indicates that the material is poisonous by inhalation in Hazard Zone C. Special Provision 3 also references §173.116(a) - Class 2, Assignment of Hazard Zone. Section 173.116(a) states that the hazard zone for a Division 2.3 material is assigned in Column 7 of the §172.101 table. The criteria specified in §173.116(a) for assignment of hazard zones are to be used when the §172.101 table provides more than one hazard zone for a Division 2.3 material, or indicates that the hazard zone must be determined on the basis of the grouping criteria for of the HMT; thus, Hazard Zone C is the correct hazard zone designation for this material. Division 2.3. The hazard zone for hydrogen fluoride, anhydrous is assigned in Column 7 I hope this answers you inquiry. Sincerely, Chief, Standards Development Office of Hazardous Materials Standards 172.101 172:102SP3 070047 173.166(9) <<>> Boothe $172.101 fluorn-seal s ricability Fluoro-Seal An ISO 9001 Certified Company Tuesday, February 20, 2007 Office of Hazmat Standards Edward Muzzullo, 400 Jih St. SW US DOT/PHMSA-DHM10 Washington, D.C. 20590 Subject: Letter of interpretation request for shipping Hydrogen Fluoride Dear Mr. Muzzullo, I am writing to get an official letter of interpretation on shipping Hydrogen Fluoride (anhydrous). figure one shows that materials in packing group 1 can be either hazard zone A or hazard According to 172.101, Hydrogen Fluoride (UN 1052) is packing group 1. 173.133, This section states "This material is poisonous by inhalation in hazard zone C". This The special provision 3 under column 7 of 172.101 refers to 172.102, special provision 3. seems to contradict 173.133 figure one. This special provision also refers to 173.116(a) which is a table showing that Hydrogen Fluoride would be in Hazard Zone B. Can you please clarify under which hazard zone hydrogen fluoride should be stipped. Please feel free to contact me if you have any questions on any of the above, or if I can be of further assistance by phone at (281) 578 1440, fax at (281) 578 3159 or by email at pcrook@fsicorp.com Sincerely, FLUORO-SEAL INTERNATIONAL, L.P. Pawl s. Crook Paul J. Crook Safety & Environmental Manager ALIENTOWN. PA ATLANTA, GA BUFFALO.NY Fluoro-Seal • 16360 Park Ten Place • Suite 325 • Houston, Texas 77084 • 281-578-1440 • Fax 281-578-3159 WEST CHICAGO. IL COLUMBUS OH HOMERVILLE GA HOUSTON. TN KANSAS C TY. MO ST. LOUIS. MO YUMA, AZ ## Provenance - Official: Yes - Source: - Source ID: `phmsa` - SHA-256: `2c61476b2c1acf6cab3b66b775360915b27fc594984f6c5af55dd58890d52fe4` - Retrieved: 2026-08-20T00:59:31.977Z - Exported: 2026-08-23T13:52:03.755Z - Document slug: `phmsa-interpretation-07-0047` ### Source metadata ```json { "materialSubtype": "interpretation", "interpretationArea": "hazardous_materials", "representation": "full_text_from_official_pdf", "companies": [ "Fluoro-Seal International" ], "individuals": [ "Mr. Paul J. Crook" ], "refIds": [ "07-0047" ], "catalogDates": [ "2007-03-26" ], "catalogParts": [ 172, 173 ], "catalogRowCount": 3, "sourceRecordUrls": [ "https://www.phmsa.dot.gov/node/46566" ], "linkedAttachmentUrls": [], "unavailableResponseUrls": [], "duplicateRepresentationUrls": [], "citedSections": [ "172.101", "172.102", "173.166", "173.166(9)", "173.116(a)", "173.133" ], "catalogPageUrls": [ "https://www.phmsa.dot.gov/regulations/title49/section/172101", "https://www.phmsa.dot.gov/regulations/title49/section/172102", "https://www.phmsa.dot.gov/regulations/title49/section/173166" ], "pdfUrls": [ "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2007/070047.pdf" ], "representations": [ { "viewUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2007/070047.pdf", "detailUrl": null, "detailHtmlPath": null, "pdfUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2007/070047.pdf", "pdfArtifactPath": "data/sources/phmsa-interpretations/07-0047-a77b3e4966.pdf", "pdfArtifactSha256": "9b87bb106703f06748e3a7f1639126ad76e4f7c797ef1efb69c25fb36e4cd3a0", "extractedTextPath": "data/sources/phmsa-interpretations/07-0047-a77b3e4966.v2.txt", "extractedTextSha256": "29d307a98cd0c23c215af2bab1d53aa8b1fe6b4069747a68eacd8e3c92595841", "pageCount": 2, "extractionVersion": 2 } ], "caveat": "Interpretations apply regulations to the facts presented and do not create independently enforceable requirements.", "jurisdiction": "US" } ```