413 -70-60-50-40-30-20-10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 Allowable Temperature (°C) 2 Temperature Characteristics Urethane Rubber Heat Resistant Urethane Low Elasticity Rubber Silicon Rubber Fluororubber Nitrile Rubber Butyl Rubber Ethylene Rubber Chloroprene Rubber 2Comparison of Allowable Temperature Material Features Urethane Rubber Superior in mechanical strength and abrasion resistance to other rubbers. Especially excels in strength in repeat use and shock-absorbing properties. Can be used for applications such as Mechanical Stopper. Excellent in oil resistance but poor in chemical resistance. Ester Type is Hydrolytic. Do not use in humid and wet areas. Nitrile Rubber (NBR) Acrylic Nitrile Butadiene Rubber Economical general-purpose rubber excellent in oil resistance. Used for various applications such as O-rings and gaskets. Chloroprene Rubber (CR) Chloroprene Rubber Well-balanced synthetic rubber excellent in weather, heat, oil and chemical resistance. Non-staining chloroprene rubber which minimizes contamination from contacting materials is also available. Ethylene Rubber (EPDM) Excels in weather, low temperature and chemical resistance. Can be used for general-purpose applications such as gaskets and doorstops. Silicon Rubber (SI) Excels in heat resistance and electric property (insulation). Physiologically safe and can be used for medical, food-related and electronic devices which require heat resistance. Fluororubber (FPM) Expensive, but widely used with its excellent heat, oil, solvent and chemical resistance. Fluororubber is generally known as Teflon and Viton®. Has the highest resistance to ozone, heat, oil and chemicals in rubbers. Low Elasticity Rubber (Hanenaito®) Excels in shock and vibration resistance and absorbs energy without rebound. Physical property and durability are equal to general rubbers. Widely used as components for quiet and low-vibration products. Butyl Rubber (IIR) Isobutylene Isoprene Rubber Excellent in heat, cold and weather resistance, and good in water and chemical resistance. 2Comparison of Chemical Resistance ++= Very good, += Good, 0= Acceptable, --= Not Acceptable Gasoline Light Oil Water Strong Acid Strong Alkali Ether Keton ++ 0 -- -- -- -- ++ ++ + + -- -0 -- + ++ + ++ -- -0 -- -+ -- ++ + ++ + ++ -- ++ ++ ++ 0-+ ++ ++ ++ ++ -- -- -0 -- 0 0 0 + 0 -- 0-+ + 0 ++ -- -0 + Urethane Nitrile Chloroprene Ethylene Butyl Silicon Fluorine Low Elasticity Ether Type Ester Type Urethane Rubber Mechanical Strength Abrasion Resistance Weather Resistance Oil Resistance Chemical Resistance Fire Resistance Low Temp. Resistance Heat Resistance 5 0 Nitrile Rubber Mechanical Strength Abrasion Resistance Weather Resistance Oil Resistance Chemical Resistance Fire Resistance Low Temp. Resistance Heat Resistance 5 0 Chloroprene Rubber Mechanical Strength Abrasion Resistance Weather Resistance Oil Resistance Chemical Resistance Fire Resistance Low Temp. Resistance Heat Resistance 5 0 Ethylene Rubber Mechanical Strength Abrasion Resistance Weather Resistance Oil Resistance Chemical Resistance Fire Resistance Low Temp. Resistance Heat Resistance 5 0 Silicon Rubber Mechanical Strength Abrasion Resistance Weather Resistance Oil Resistance Chemical Resistance Fire Resistance Low Temp. Resistance Heat Resistance 5 0 Fluororubber Mechanical Strength Abrasion Resistance Weather Resistance Oil Resistance Chemical Resistance Fire Resistance Low Temp. Resistance Heat Resistance 5 0 Low Elasticity Rubber Mechanical Strength Abrasion Resistance Weather Resistance Oil Resistance Chemical Resistance Fire Resistance Low Temp. Resistance Heat Resistance 5 0 Butyl Rubber Mechanical Strength Abrasion Resistance Weather Resistance Oil Resistance Chemical Resistance Fire Resistance Low Temp. Resistance Heat Resistance 5 0 2Rubber Properties 10 20 30 40 50 60 70 80 90 Durometer A (Shore A) 20 30 40 50 60 70 80 90 Asker C SRIS 0101 C Type 2Hardness Images t Margin of Error: ±5 Hard Soft Shore A95 Golf Ball Shore A90 Baseball Shore A70 Softball Shore A50 Plastic Eraser Shore A30 Bicycle Tube Shore A15 Firm Gelatin 2Indication of Hardness Shore A Used to describe the hardness of Urethane and Rubbers. "Shore A 70" means hardness measured by using type-A Durometer in accordance with New JIS Standard K6253. ASKER C Used to describe the hardness of Sponges. "Asker C 25" means hardness measured by using a spring type hardness tester Asker C in accordance with SRIS 0101 (Standard by the Society of Rubber Industry, Japan). For those two above, larger value indicates harder material. Penetration Used to describe the hardness of gel materials. JIS K 2207 Standardized testing method. It indicates hardness by the penetrated length that a pin of specified weight penetrates in a sample perpendicularly. The value is one penetration for 1/10mm length. (Larger value indicates softer material.) Three hardness categories are used for MISUMI's Urethane, Rubbers and Sponges. t5ZQFT PG %VSPNFUFST BOE 0CKFDUT PG .FBTVSFNFOU Type D Soft Hard Type A Durometer: General Rubber Powder Puff Plastic Soft Rubber Sponge Types C, E Type F There are various types of durometer instrument as shown above to measure the hardness of a material, depending on the property of the measured material. For urethane and rubber, Type A (Asker Durometer Type A) compliant with JIS K 6253 is most commonly used. Hardness of materials softer than urethane and rubber is measured by Asker Type C or Type E. Shock absorbing gel is soft and super flexible material whose hardness is measured by Asker Type F. 2Ref.: Bending Test by Hardness Test Conditions: Standard Urethane, Thickness 5mm, Width 30mm, Length 40mm When pulled by push-pull gauge with the load 5N: Shore A50 Shore A30 Shore A15 Shore A95 Shore A90 Shore A70 Urethane, Rubbers and Sponges Rubber Properties
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