# Arkema – Health Environment and Safety — Hazardous Materials Safety Interpretation **Citation:** 22-0052 **Type / status:** guidance / guidance **Agency:** Pipeline and Hazardous Materials Safety Administration **Effective:** Not stated **Published:** 2023-04-03 22-0052 response to Arkema – Health Environment and Safety concerning 172.101, 173.225. ## Document text <<>> U.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration April 3, 2023 1200 New Jersey Avenue, SE Washington, DC 20590 Mr. Steve Schulte, CHMM, CPP Hazardous Materials/Dangerous Goods Consultant Arkema – Health Environment and Safety 9001st Ave King of Prussia, PA 19406 Reference No. 22-0052 Dear Mr. Schulte: This letter is in response to your May 16, 2022, email requesting clarification of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) applicable to organic peroxides. In your email, you present a scenario where tert-Butyl hydroperoxide is transported as “UN3103, Organic peroxide type C, liquid, 5.2” which is listed in the Hazardous Materials Table (HMT; § 172.101) as a Division 5.2 material with no subsidiary hazard. However, you note that Note 13 in Column 8 of the Organic Peroxide Table found in § 173.225 indicates that tert-Butyl hydroperoxide requires an additional Class 8 (corrosive) label, in addition to the Division 5.2 label. You ask whether your understanding is correct that a shipment of “UN3103” comprised of tert-Butyl hydroperoxide requires both a Division 5.2 label and a subsidiary Class 8 label. You are correct that the HMT does not list “UN3103, Organic peroxide type C, liquid, 5.2” with a Class 8 subsidiary hazard. However, as noted in your email, the Organic Peroxide Table in § 173.225 requires tert-Butyl hydroperoxide to have a subsidiary Class 8 (corrosive) label. I hope this information is helpful. Please contact us if we can be of further assistance. Sincerely, T. Glenn Foster Chief, Regulatory Review and Reinvention Branch Standards and Rulemaking Division <<>> Andrews 22-0052 Standards and Rulemaking Division Pipeline and Hazardous Materials Safety Administration Attn: PHH-10 U. S. Department of Transportation East Building 1200 New Jersey Avenue, SE. Washington, D.C. 20590-0001 RE: Request Letter of Interpretation regarding subsidiary risks Organic Peroxides 49 CFR 173.225 Dear Madam / Sir: Request a letter of interpretation regarding the addition of subsidiary risk labels for Organic Peroxides listed in Column (8) Notes of 49 CFR 173.225 Table to Paragraph ( c ): Organic Peroxide Table My understanding is that Organic Peroxides with the number 13 in column 8, Notes of the Table to Paragraph ( c ) indicates that the material requires an additional class 8 corrosive label along with the Division 5.2 label required in the Hazardous Materials Table 49 CFR 172.101. As an example a shipment of tert-Butyl Hydroperoxide which is UN 3103 would require the Division 5.2 and class 8 label according to the table in 173.225 even though UN3103 does not list the addition of class 8 label in the Hazmat Table in 172.101. Is my understanding correct? Sincerely, Steve Schulte Steve Schulte, CHMM, CPP Arkema – Health Environment and Safety Hazardous Materials/Dangerous Goods Consultant SCHULTE-EXT Steve <<>> From: INFOCNTR (PHMSA) To: Dodd, Alice (PHMSA) Cc: Hazmat Interps Subject: FW: Clarification Letter of Interpretation Note 13 Organic Peroxide Table 49 CFR 173.225 Date: Tuesday, May 24, 2022 11:47:56 AM Attachments: Clarification Organic Peroxide Table Note 13 49 CFR 173.225.docx Hi Alice, Please see the attached interpretation request. Should you need anything, do not hesitate to reach out. Regards, -Breanna From: SCHULTE-EXT Steve Sent: Monday, May 16, 2022 9:34 AM To: INFOCNTR (PHMSA) Cc: KURTZ Christina Subject: Clarification Letter of Interpretation Note 13 Organic Peroxide Table 49 CFR 173.225 CAUTION: This email originated from outside of the Department of Transportation (DOT). Do not click on links or open attachments unless you recognize the sender and know the content is safe. Dear Madam / Sir: Please find my request for a letter of interpretation attached. Regards, Steve Schulte, CHMM, CPP Arkema – Health Environment and Safety Hazardous Materials/Dangerous Goods Consultant Cell: 651-245-8951 Ce courriel, pièces jointes incluses, peut contenir des informations confidentielles et/ou couvertes par le secret professionnel et/ou propriété du Groupe Arkema ou de tiers. Il ne peut être utilisé que dans le cadre de son objet. Si vous n'en êtes pas le destinataire, merci d’en informer l’expéditeur par retour et de supprimer ce courriel sans le lire, le copier ni le distribuer. Merci. This e-mail, attachments included, may contain information that is confidential and/or privileged and/or proprietary to the Arkema Group or third party. It may only be used for its intended purpose. If you are not the intended recipient, please advise the sender by return and delete this e-mail <<>> without reading, copying nor distributing it. Thank you. ## Provenance - Official: Yes - Source: - Source ID: `phmsa` - SHA-256: `90b3afc425c465e85f7cf743617ca42bfd0b619e9eb6a3666edec36c9b083c7f` - Retrieved: 2026-08-20T00:59:31.977Z - Exported: 2026-08-22T19:15:29.976Z - Document slug: `phmsa-interpretation-22-0052` ### Source metadata ```json { "materialSubtype": "interpretation", "interpretationArea": "hazardous_materials", "representation": "full_text_from_official_pdf", "companies": [ "Arkema – Health Environment and Safety" ], "individuals": [ "Steve Schulte" ], "refIds": [ "22-0052" ], "catalogDates": [ "2023-04-03" ], "catalogParts": [ 172, 173 ], "catalogRowCount": 2, "sourceRecordUrls": [ "https://www.phmsa.dot.gov/node/73546" ], "linkedAttachmentUrls": [], "unavailableResponseUrls": [], "duplicateRepresentationUrls": [], "citedSections": [ "172.101", "173.225" ], "catalogPageUrls": [ "https://www.phmsa.dot.gov/regulations/title49/section/172101", "https://www.phmsa.dot.gov/regulations/title49/section/173225" ], "pdfUrls": [ "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/docs/standards-rulemaking/hazmat/interpretations/77256/220052.pdf" ], "representations": [ { "viewUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/docs/standards-rulemaking/hazmat/interpretations/77256/220052.pdf", "detailUrl": null, "detailHtmlPath": null, "pdfUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/docs/standards-rulemaking/hazmat/interpretations/77256/220052.pdf", "pdfArtifactPath": "data/sources/phmsa-interpretations/22-0052-ed5756f569.pdf", "pdfArtifactSha256": "6160a744cc8c3b849987e3304405b45a8d90db50d439499803845dc8fba5fc48", "extractedTextPath": "data/sources/phmsa-interpretations/22-0052-ed5756f569.v2.txt", "extractedTextSha256": "7f9862c59ec8908146feac3c43c725825489e0821382bbb8ecc90d62924709e6", "pageCount": 4, "extractionVersion": 2 } ], "caveat": "Interpretations apply regulations to the facts presented and do not create independently enforceable requirements.", "jurisdiction": "US" } ```