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Handling Precautions for Viton™ and Related Chemicals

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Handling Precautions for Viton™ and Related Chemicals Handling Precautions for Viton™ and Related Fluoroelastomers Chemicals Technical Information Introduction As with many polymers, minute quantities of potentially This bulletin provides basic information necessary for irritating gases may diffuse from the raw elastomer on the safe handling of Viton™ fluoroelastomers as a class of storage, even at room temperature. All containers should materials and their associated chemicals and compounds. be opened and used in well-ventilated areas. Information on cleanup after accidental burning is also Good practice dictates that impervious gloves be worn included. when handling raw polymer or chemicals. In case of eye Individual polymers and chemicals, especially contact, immediately flush the eyes for at least 15 min ™ experimental and semi-commercial grades and with water. If bare skin is contacted by Viton , wash with ™ proprietary precompounds, may differ in their safe water. Pelletized types of Viton may accumulate a static handling requirements. These are covered by Safety Data charge during handling and pouring from a bag. If polymer Sheets (SDS), which you can obtain from your Chemours pellets are handled in the vicinity of flammable vapors, e.g., representative for all of our products. when making coatings or adhesives, efficient spark-proof ventilation should be provided. Equipment and personnel The current SDS, furnished with your first shipment should be grounded to avoid hazards from a possible static ™ of Viton , or when updated, should always be reviewed electricity discharge. Refer to the National Fire Protection ™ prior to experimental or production use of any Viton Association (NFPA) RP77 “Recommended Practice on fluoroelastomer, precompound, or associated chemical. Static Electricity” for guidelines in reducing the fire hazards Further copies are available upon request. associated with static electricity. As with the majority of polymer-based systems, the key to Disposal safe handling during processing is often the provision of adequate ventilation. Specific ventilation guidance is not In case reuse or recycling is not possible, incineration with given in this bulletin, but if needed, can be obtained from energy recovery is the preferred method of disposal. The industry heating and ventilation experts. incinerator must be equipped with an appropriate scrubber to remove hydrogen fluoride. Local regulations must be Workplace concentration limits for air contaminants followed. Disposal via landfill in accordance with local are governed by federal, state, and local regulations. regulations is another option. This bulletin, and associated SDS, can indicate the likely emissions and quantities from a unit of polymer or Accidental Burning compound; but, only the processor can assess conditions Necessary information for fire fighters and cleanup staff is in a specific plant or operation. given in the section entitled “Vulcanizates.” Raw Materials Curatives and Curing Agents Viton™ Fluoroelastomers Handling in Use Handling in Use The range of curatives and auxiliaries offered by Chemours differs markedly in chemical composition, depending upon Using recommended handling procedures, raw un- the nature of the vulcanization system. Table 1 summarizes precompounded Viton™ fluoroelastomers present no compositions, LD50 values, and hazard ratings according significant health hazards. to European Directive 67/548/EEC, as amended, and Viton™ Fluoroelastomers 2001/58/EC for mixtures. It is essential to consult the Suggested maximum use limits are 2 phr for VC-1 and current individual SDS for each product prior to first use; 4 phr for VC-3. but, certain basic principles for safe handling apply to all, Note: Additional information on Viton™ curing agents is i.e.: contained in Chemours bulletin, “Viton™ Curing Agents for • Contact with eyes, skin, and clothing should be avoided. Viton™ Fluoroelastomers.” Viton™ Curative No. 4 (VC-4) is Wear impervious gloves and a facemask when handling. a polyfunctional amine-based curative now sold only by Avoid breathing vapors. Use only with adequate the R.T. Vanderbilt Company and its agents. The supplier’s ventilation. SDS and product label information should be studied prior to use. • If skin contact occurs, flush the skin with water. In the event of eye contact, flush with water for at least Peroxide-Based Systems 15 min and obtain qualified medical attention. Wash Chemours supplies Viton™ Curative No. 7 (VC-7) contaminated clothing before reuse. and TMAIC (trimethallyl isocyanurate) for use as co- • In the event of accidental exposure to vulcanization agents in the peroxide vulcanization of G-type Viton™ vapors or combustion fumes, move to fresh air fluoroelastomer grades. VC-7 may be either a liquid or immediately. If the exposed person is not breathing, crystalline solid at ambient temperatures. TMAIC is a give artificial respiration. If the exposed person has granular solid that may form flammable dust-air mixtures. difficulty breathing, administer oxygen. Call a physician It should be kept away from heat, sparks, and flame and immediately. only used where equipment is grounded. Chemical Classes Additional information on TMAIC is contained in Chemours bulletin, “TMAIC, A Coagent for Peroxide-Cured Dihydroxyaromatic (Bisphenol) Systems Viton™.” Three of the commercial curatives offered in this group Note: Chemours does not supply peroxides. Suppliers, are Viton™ Curatives No. 20, 30, and 40. They are SDS, product labels, and other safe handling information masterbatches of chemicals in Viton™ fluoroelastomer. should be consulted prior to use. This reduces any potential hazards from exposure to dust in handling. The precautions for safe handling of raw Viton™ Processing Aids polymers and compounds also apply to these products. Three proprietary processing aids are available, A fourth curative, Viton™ Curative No. 50, is not a designated VPA (Viton™ Processing Aids) No. 1, No. 2, and masterbatch, but rather a 100% active curing agent. No. 3. Descriptions and (67/548/EEC classifications) of Exposure to dust may be irritating to nose and throat. these products are given in Table 2. All four curatives are skin irritants to guinea pigs, but Storage containers should be kept in a cool, dry place. do not cause sensitization. Additional information on Viton™ curatives is contained in Chemours bulletin, “Viton™ VPA No. 1 and No. 3 can cause irritation of eyes and Curative No. 50.” skin. Handling precautions are essentially the same as those for VC-1, VC-3, and TMAIC, including treatment Polyfunctional Amine Systems for accidental inhalation of dust or fumes and eye Viton™ Curative Nos. 1 (VC-1) and 3 (VC-3) may cause contamination. irritation of eyes and skin and may also form flammable VPA No. 2 has no toxicological hazards known to dust-air mixtures. They should be kept away from heat, Chemours. sparks, and flame and only used where equipment is grounded. These products present no special disposal problems. Dispose of them in accordance with federal, state, and If used in abnormally high concentrations, VC-1 and VC-3 local regulations for sulfur chemicals and waxes. can promote substantial heat buildup in compounds of Viton™ during injection, compression, or transfer molding Additional information may be found in individual SDS and or extrusion (see Appendix 1). Chemours bulletin, “Viton™ Processing Aids.” 2 Viton™ Fluoroelastomers Table 1. Viton™ Fluoroelastomer Curatives and Auxiliaries: Nature and Hazard Ratings Product Composition Active Ingredient Hazards1 Product Rating2 Dihydroxyaromatic (Bisphenol) Systems 33% benzyltriphenylphosphonium chloride, Viton™ Curative No. 20 LD50 = 43 T3 67% Viton™ polymer 50% 2,2-bis-4-hydroxyphenylperfluoropropane (bisphenol AF), LC50 = <1 Viton™ Curative No. 30 Xi, N 50% Viton™ polymer ALD = 3,400 33% 2,4-dihydroxybenzophenone, LD50 = 6,100 Viton™ Curative No. 40 Xi, N 67% Viton™ polymer LC50 = 4.6–10 Bisphenol AF ALD = 3,400 Viton™ Curative No. 50 Benzyltriphenylphosphonium- LD50 = 4,385 Xi, N Bisphenol AF salt LC50 = <1 Polyfunctional Amines Viton™ Curative No. 1 (VC-1) 100% hexamethylene diamine carbamate LD50 = 2,875 Xi Viton™ Curative No. 3 (VC-3) 100% N,N’-dicinnamylidene-1,6-hexanediamine ALD = 6.2 Xi Peroxide System Co-Agents Viton™ Curative No. 7 (VC-7) 100% triallyl isocyanurate LD50 = 700 Xn TMAIC (trimethallyl isocyanurate) 100% trimethallyl isocyanurate LD50 = 3,376 Xn 1Human Health: Oral Rat, LD50 mg/kg; Toxicity to Fish: LC50 (96 hr) mg/L; Inhalation: ALD (4 hr rat) mg/L 2According to 67/548/EEC as amended and 2001/58/EC for mixtures 3Xn = Harmful, Xi = Irritant, N = Environmental Hazard, T = Toxic Table 2. Chemours Process Aids: Nature and Hazard Ratings Active Ingredient Hazards Rating by 67/548/EEC, as Amended, Product Composition Human Health: Oral Rat, LD50 mg/kg and 2001/58/EC for Mixtures VPA No. 1 66% aromatic sulfur compound in hydrocarbon wax LD50 = 24,0001 Xi2 VPA No. 2 100% natural vegetable wax — — Approximately 74% aliphatic sulfur compound on an VPA No. 3 LD50 = 2,400 Xn inert silica carrier tetramethylene sulfone 1Dermal Mouse 2Xn = Harmful, Xi = Irritant Other Compounding Ingredients 50 µg/m3 of lead in air averaged over an 8-hr period. However, an action level of 25 µg/m3 of lead in air requires General special procedures. See the OSHA Regulation cited Compound ingredients for Viton™ from sources other previously. Before using lead compounds, local regulations than Chemours may pose hazards in handling and use. on use and disposal, including scrap compounds and Before use, suppliers’
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