Craftech Industries® Top Elastomeric Materials Guide Craftech Industries®, 2014 8 Dock Street, Hudson, NY 12534 Website: www.craftechind.com Blog: info.craftechind.com/blog E-mail: [email protected] Phone: 518-828-5001 or 800-833-5130 Fax: 518-828-9468 Craftech Industries® Top Elastomeric Materials Guide 4 Elastomer Material Descriptions 6 Elastomer Mechanical Properties 7 Elastomer Chemical Resistance Data Elastomer Material Descriptions ELASTOMER TYPE DESCRIPTION STRENGTH(S) LIMITATION(S) VITON® A fluoroelastomer utilized when Performs well in high Relatively high cost both high temperature and temperatures and in the material with limited chemical resistance are required. presence of acids when the hardness range. Poor proper grade is selected. resistance to ketones, Very good weathering and low molecular weight ozone resistant properties. esters, alcohols and nitro- containing compounds. SILICONE Used in applications where Excellent high temperature Poor resistance to solvents, high temperature performance resistance. Excellent oils, concentrated acids, is required. Due to its purity weather, UV, and ozone and steam. Tensile strength when processed, Silicone is often resistance. and tear resistance are both used in food processing and poor. pharmaceutical fields. Used for industrial applications because of its long service life. BUNA-N Used in applications where Very good resistance to oils, Poor resistance to UV, gasoline, oil, and greases may solvents, and fuels. ozone and weathering. be present. This material is also Does not perform well with known under other generic names ketones and chlorinated such as Nitrile, Buna or NBR. hydrocarbons. EPDM An elastomer that is a popular Very good resistance to Poor resistance to oils (ethylene propylene choice for outdoor applications ozone, UV, and sunlight. and solvents, aromatic diene monomer) where weather and water Performs well in higher hydrocarbons, and resistance is crucial. Also known temperatures and where petroleum products. as M-Class synthetic rubber. steam, brake fluid, and/or weak acids may be present. NEOPRENE A popular elastomer considered Performs well in moderate Poor resistance to strong by many as a “General Purpose” exposure to ozone, UV, acids, strong solvents, rubber. Often misused as a generic weather. Provides good esters, and ketones. Does term for “rubber.” resistance to oils, greases, not perform well with and weaker solvents as well. chlorinated, aromatic, or nitro-hydrocarbons. FLUOROSILICONE This elastomer is utilized as a Excellent high temperature Poor resistance to brake substitute for silicone when higher resistance. Excellent fluids and ketones. levels of chemical resistance are resistance to moderate Moderate physical required. or oxidizing chemicals, properties. ozone, aromatic chlorinated solvents and bases. 4 © 2014 Craftech Industries® www.craftechind.com (800) 833-5130 ELASTOMER TYPE DESCRIPTION STRENGTH(S) LIMITATION(S) SBR One of the first synthetic rubbers Very good abrasion Poor resistance to oils, (styrene-butadiene and the most widely used in the resistance, similar to natural fuels, solvents, and rubber) past. Was known for its low cost rubber. It boasts a relatively hydraulic fluids. Fair in the marketplace. low cost. resistance to weathering, similar to natural rubber. SYNTHETIC The synthetic version of natural Very similar to natural Same limitations as Natural POLYISOPRENE rubber. Also known as “Synthetic rubber. Free of allergenic Rubber. (See Below) Natural.” It contains no rubber proteins of natural rubber tree latex. (latex free). NATURAL/GUM An elastomer made from rubber High elongation and Deteriorates when exposed RUBBER tree latex. resilience with high to oils, fuels, solvents and tensile strength. Excellent hydraulic fluids. Poor abrasion resistance and resistance to sunlight and low compression set. Good ozone. Not recommended flexing qualities at low for outdoor applications. temperature. Poor high temperature resistance. Please Note: The information presented above is for general guideline purposes only. Craftech Industries, Inc. does not guarantee its completeness or accuracy, nor assumes any responsibility for its use. www.craftechind.com (800) 833-5130 © 2014 Craftech Industries® 5 Elastomeric Mechanical Properties Data SILICONE FLUOROSILICONE EPDM NEOPRENE BUNA-N/NITRILE FKM/VITON® ASTM PVMQ / VMQ FVMQ Fluoro- Ethylene CR Chloroprene NBR-Nitrile buta- Fluoro- Designation Polydimethyl- substituted silenes propylene diene rubber elastomer siloxane diene Properties Specific Gravity .95-1.2 1.2-1.4 .86-1.1 1.2-1.4 1.0-1.2 1.98 Useful Durometer 30-90 40-80 40 -90 30-95 40-95 50-90 Range Tensile Strength 700-1200 900-1500 1800-2500 2500-4000 1000-3500 1000-3000 (psi) Elongation @ Break 900 400 600 600 650 300 (%) Low Temperature -100 -70 -50 -40 -35 - 30 Limit (approx. °F, 5:1 Stiffening) High Temperature + 350 + 325 + 250 + 200 + 200 + 450 Limit (°F, Continuous) High Temperature + 600 + 500 + 325 + 300 + 300 + 500 Limit (°F, Intermittent) Tear Resistance C-B D C B B B Abrasion Resistance B D B A A B Compression Set B-A C-B B-A B B B-A (CS) Creep C-A B C-B B B B-A Ozone Resistance A A A A C A Weather Resistance B B A B NR B Gas Impermeability NR NR D C B A Flame Resistance NR C NR C NR A Electrical A C B D D C Resistance Dielectric Constant 3.1 6.5 2.5 6.7 15-20 8.8-10.7 Dielectric Strength 500-1000 380 500-1400 400-600 230-280 400-600 (V/mil) A = Excellent B = Good C = Fair D = Use with caution NR = Not Recommended 6 © 2014 Craftech Industries® www.craftechind.com (800) 833-5130 Elastomeric Chemical Resistance Data CHEMICAL SILICONE FLUOROSILICONE EPDM NEOPRENE BUNA-N VITON® INTERACTION Acetone C D A C D D Ammonia Gas A A A A A D (cold) Ammonia Gas A D B B D D (hot) Benzene D A D D D A Carbon D A D D C A Tetrachloride Chlorine (Aq.) D B C C D B Chloroform D B D D D A Diesel Oil D A D C A A Fluorine D No Rating D D D B Gasoline, D A D C B A Unleaded Hydrochloric C B A B C A Acid (cold) 37% Hydrochloric D D C D D B Acid (hot) 37% Hydrofluoric Acid D D C D D A (Conc) Cold Hydrofluoric Acid D D D D D D (Conc) Hot Hydrofluoric Acid D No Rating C D D D - Anhydrous Hydrogen B B B D D B Peroxide (90%) Lubricating Oil D A D B A A (Petroleum) Lye (Sodium B A A B B B Hydroxide) A - No attack, possibly slight absorbtion. Negligible effect on mechanical properties. B - Slight attack by absorption. Some swelling and a small reduction in mechanical properties likely. C - Moderate attack of appreciable absorbtion. Material will have limited life. D - Material will decompose or dissolve in a short period of time. www.craftechind.com (800) 833-5130 © 2014 Craftech Industries® 7 CHEMICAL SILICONE FLUOROSILICONE EPDM NEOPRENE BUNA-N VITON® INTERACTION Methyl Ethyl D D A C D D Ketone Methylene D B C D D B Chloride Mineral Oil B A C B A A Nitric Acid D D D D D B (Conc.) Nitric Acid B B B B D A (Dilute) Nitric Acid - Red D D D D D C Fuming Phenol (Aq.) D B B C D A Sea Water A A A B A A Sodium Hypochlorite B B B A B A (Aq.) (Chlorox) Styrene D C D D D B (Monomer) Sulphuric Acid D C B B C A (Dilute) Sulphuric Acid D D C D D A (Conc.) Sulphuric Acid D D D D D A (20% Oleum) Toluene D B D D D B Transformer Oil B A D B A A Trichlorethylene D B D D D A Turpentine D B D D A A Xyelene D A D D D A A - No attack, possibly slight absorbtion. Negligible effect on mechanical properties. B - Slight attack by absorption. Some swelling and a small reduction in mechanical properties likely. C - Moderate attack of appreciable absorbtion. Material will have limited life. D - Material will decompose or dissolve in a short period of time. 8 © 2014 Craftech Industries® www.craftechind.com (800) 833-5130 8 Dock Street, Hudson, NY 12534 Website: www.craftechind.com Blog: info.craftechind.com/blog E-mail: [email protected] Phone: 518-828-5001 or 800-833-5130 Fax: 518-828-9468.