Den Plus Inc. — Hazardous Materials Safety Interpretation

Page 1of Transportation U.S. Department Washington, D.C. 400 Seventh Street, S.W. 20590 Research and Special Programs Administration JUN 1 2001 Dr. Shuojia Dong 4235 Beaconsfield DenPlus Inc. Ref. No. 01-0124 CANADA, Montréal, Québec H4A 2H4 Dear Dr. Dong: This is in response to your letter dated May 8, 2001, requesting clarification on the use of the limited quantity exceptions in the Hazardous You state you are shipping packages of dental acrylic monomer Materials Regulations (HMR; 49 CFR Parts 171-180).. under the description "Methyl methacrylate monomer, inhibited, 3, UN1247, PG II." understanding of the limited quantity provision (S 173.150) Specifically, you request confirmation of your Table (§ 172.101). specified for this entry in column 8A of the Hazardous Materials You are correct in your understanding of the limited quantity $ 173.150. exceptions for Class 3 (flammable liquids) as provided in in inner packagings not over 1.0 I net capacity each, packed in strong outer packagings. Class 3 materials in S 173.150 authorize exceptions from labeling The limited quantity provisions for specification packaging requirements when packaged in combination (except when transported by air), placarding, and from must conform to general packaging requirements in Part 173, packagings according to provisions in § 173.150 (b). Each package Subpart B, and may not exceed 30 kg gross weight. a non-bulk packaging Each person who offers for transportation a hazardous material in shipping name and identification number for the material as shown shall mark the package with the proper in the Hazardous Materials Table (S 172.301(a)). $ 172.312 (c), package orientation markings are not required on Under packages containing flammable liquids in inner packagings of 1.0 when L or less prepared in accordance with § 173.150 (b) or (c), except offered or intended for transportation by aircraft. 173.150 010124#

Page 2requirements of Part 172, Subpart C. The shipping paper you provided is not in accordance with the a hazardous material on the shipping paper must include the The shipping description of proper shipping name, hazard class, identification number, and packing group prescribed for the material in the Hazardous Materials Table, with no additional information interspersed inhibited, 3, UN1247, PG II." (§ 112.202) • For example: "Methyl methacrylate monomer, gross mass, capacity, or as otherwise appropriate), including the The total quantity (by net or unit of measurement, of the hazardous material covered by the description must be shown either before or after the basic description.. The description for a material offered for transportation as "limited quantity," as authorized by the HMR, the basic description (§ 172.203(b)). The required shipping must include the words "Limited Quantity" or "Itd Oty" following description on a shipping paper and all copies thereof used for transportation purposes, must be legible and printed in English ($ 172.201 (a) (2)) . I hope this satisfies your request. Sincerely, Transportation Regulations Specialist Office of Hazardous Materials Standards#

Page 3MCInture 3173.150 DENPLUS Packaging 01-0124 Mr. Edward T. Mazzullo Director, Office of Hazardous Materials Standards U.S. DOT/RSPA (DHM-10) 400 7th Street S.W. Washington, D.C. 20590-0001 May 8th, 2001 Dear Mr. Mazzullo, requirements of CFR49. Could you please let us know if our following shipping procedure to/within US conforms to the Hazard Material Description: Material: Dental acrylic monomer UN number: Shipping name: 1247 Methylmethacrylate monomer inhibited Hazard Class: 3 Packaging group: II Packaging exception: 173.150 Packaging Description: Inner packaging (Hazard): I L (maximum) in metal can ;c.- wrapped in PE bag and further protected with PE bubble sheet. Outer packaging 1: Fiberboard box withstand 65 lb. gross weight contains: Cushioned with PS loose fill. 1 inner packaging (hazard) and 5 16 PMMA (non hazard) Gross weight =4.5 kg Total hazard material: IL Outer packaging 2: Fiberboard box withstand 65 Ib. gross weight contains maximum 4 outer packaging 1. Cushioned with PS loose fill. Gross weight = 18 kg Total Hazard material: 4 x 1L DENPLUS inc., 4235 Beaconsfield, Montréal, Québec, Canada, H4A 24 (514) 488-7156 • 1-888-344-4424 • Fax: (514) 484-9866#

Page 4: Labeling and Shipping Documents Labeling: see attached page 1. Shipping documents: packing slip (see sample on page 2). Exceptional situations: Could we apply the article 173.150 to the following situations: 1) Outer packaging: Fiberboard box withstand gross weight 65 lb. contains up to 16 x inner packaging 1. Total hazard material = 16 x 1L= 16 L Gross weight = 18 kg 2) On pallet: Up to 64 x Outer packaging 1 Total hazard material = 64 x 1L ( kg) Gross weight = 300 kg I would appreciate very much your earlier assistance. Thank you for your attention. Best Regards, A done Shuojia Dong, Ph. D Phone: 450-646-1330 Fax: 450-646-1350 e-mail: shuojia@denplus.com#

Page 5attached page 1 DENPLUS Outer packaging labelings Methyl sethacrylate wownsw Miltiescrylata die anétbyle monenere indibites (lizatteel quasily) stahidsé (qaantié lmitée) INTERNATIONAL COMPLIANGE CENTRE L421X8 L305 DENPLus inc., 4235 Beaconsfield, Montréal, Québec, Canada, H4A 2H4 (514) 488-7156 • 1-888-344-4424 • Fax: (514) 484-9866#