# Mr. Mark Villarino — Hazardous Materials Safety Interpretation - **operation:** document - **citation:** 99-0097 - **title:** Mr. Mark Villarino — Hazardous Materials Safety Interpretation - **source type:** guidance - **agency:** Pipeline and Hazardous Materials Safety Administration - **status:** guidance - **official:** true - **published on:** 1999-05-25 - **effective on:** Not available - **summary:** 99-0097 concerning 172.101. - **machine formats:** - **json:** https://regulus.evalyn.ai/document/phmsa-interpretation-99-0097.json - **markdown:** https://regulus.evalyn.ai/document/phmsa-interpretation-99-0097.md - **app url:** https://regulus.evalyn.ai/document/phmsa-interpretation-99-0097 - **source url:** https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/1999/990097.pdf **body:** <<>> of Transportation U.S. Department 400 Seventh Street, S.W. Washington, D.C. 20590 Research and Special Programs Administration MAY 25 1999 Mr. Mark Villarino Reference No. 99-0097 Hazard Communication Specialist 14422 South San Pedro Street Gardena, CA 90248 Dear Mr. Villarino: This is in response to your letter of April 13, 1999, regarding the basis of solution percentages under the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180). Specifically, you ask whether the concentration of sulfuric acid is based on weight/weight, volume/volume, or weight/volume. The percentages of the sulfuric acid entries in the hazardous materials table are based on the weight of the solute to the weight of the solvent. I hope this answers your inquiry. If we can be of further assistance, please contact us Sincerely, Hill Delmer te. Billings Chief, Standards Development Office of Hazardous Materials Standards 172.10/(s). 990097. /22 <<>> *.. БРЕСТАЧМ® Georse 8172.101 (S) Sulferic feid. 99-0097 April 13, 1999 FAX: 202-366-3012 Edward T. Mazzullo Director of the Office of Hazardous Material Standards Research and Special Programs Administration Department of Transportation Dear Mr. Mazzullo, I called the information center at 1-800-467-4922 to clarify what the percent for the limits of the Sulfuric acid entry was based on (weight/weight, volume/volume, or weight/volume). The regulations do not address this. I was transferred to Mr. George Cushmac who was very helpful and confirmed that the regs do not address this issue but through his checking, he believes the percentage to be based on a weight-to-weight ratio (weight of solvent to weight of solute). He also suggested that 1 write you to request confirmation in writing from you in this matter. I now ask that you please provide written confirmation of Mr. Cushmac's statement that solution percentages in the Hazardous Materials Table are based on a weight to weight ratio. Thank you for your time and I will be expecting a prompt response. Sincerely, Made Victims Mark Villarino Hazard Communication Specialist SO SDRE Spectrum Quality Products, Inc. S Corporate Headquarters: Hast Coust Piant 14422 South San Pedro Street 755 Jerscy Avenue Gardena, California 90248 New Brunsivick, Vew Jersey 08901 (310) 516-8000 - Fax: (310) 516-9843 732) 214-1300 • Fax: (732) 220-6553 - **truncated:** false - **body characters:** 2365