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| ACM: Polyacrylate |
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| Polyacrylate is a copolymer (ethyl acrylate) with exceptional resistance to petroleum fuels and oils. The automotive industry uses polyacrylate O-rings as seals in automatic transmissions and power steering designs. Resistant to flex cracking, polyacrylate also resists damage from oxygen, sunlight, and ozone. Though it is marginally more resistant to hot air than nitrile, polyacrylate falls short in strength and compression set resistance, as well as in resistance to water and low temperatures. Commonly used in transmissions and power steering units and applications where flex cracking is important. |
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Advantages:
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Good heat resistance, transmission fluid resistance |
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Disadvantages:
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Susceptible to oxygenated fluids, low temperature limitations, compression set and water resistance |
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Material
Code
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Hardness
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Lower
Temperature
Limit (ºF)
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Upper
Temperature
Limit (ºF)
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Comments
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Specifications Met
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Shore A
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7078
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80 +/-5
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-40
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230
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Friction reducers added.
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Return to top
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| AU: Polyester Urethane (Urethane) |
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| Polyurethane is the toughest, most extrusion-resistant and most abrasion-resistant of all elastomeric sealing materials. Polyurethane is also very resistant to explosive decompression and has excellent properties over a wide temperature range. Polyurethane O-rings are used in a wide variety of products, including quick-disconnect hydraulic fittings, hydraulic cylinders and valves, pneumatic tools, CO2 firearms, or for any application requiring extreme abrasion or extrusion resistance. Used on skate board wheels, molded gears, o-rings, etc. |
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Advantages:
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Excellent strength, abrasion and ozone resistance |
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Disadvantages:
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Poor aromatic fluid resistance, no brake fluids |
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Material
Code
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Hardness
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Lower
Temperature
Limit (ºF)
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Upper
Temperature
Limit (ºF)
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Comments
|
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Specifications Met
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Shore A
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7149
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50 +/-5
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-30
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160
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General purpose
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7150
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70 +/-5
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-30
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160
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General purpose
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7148
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80 +/-5
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-30
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160
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General purpose
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Return to top
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| CR: Polychloroprene (Neoprene) |
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| Chloroprene exhibits medium heat and oil resistance, excellent weather resistance, with a degree of flame resistance. It has a moderately broad range of service temperatures, good dynamic load bearing and strength properties. It was originally developed as an oil resistant substitute for natural rubber. Commonly used on CV joint type boots and bridge mounting pads. |
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Advantages:
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Toughness, moderate oil resistance, flame resistance, adhesion, outstanding resistance to damage caused by flexing and twisting |
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Disadvantages:
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Moderate ozone resistance, limited flexibility at low temperatures |
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Material
Code
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Hardness
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Lower
Temperature
Limit (ºF)
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Upper
Temperature
Limit (ºF)
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Comments
|
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Specifications Met
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Shore A
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7143
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35 +/-5
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-30
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180
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General purpose
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7142
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50 +/-5
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-30
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180
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General purpose
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7145
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55 +/-5
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-40
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180
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General purpose, commonly used for tie rod boots
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7139
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60 +/-5
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-30
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180
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General purpose, commonly used for inflatable seals
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7147
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65 +/-5
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-35
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180
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General purpose
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7146
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70 +/-5
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-35
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180
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UL recognized for swimming pool pumps, filters & chlorinators(includes hot tubs & spas) up to 60ºC
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UL1081
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7138
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70 +/-5
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-35
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180
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UL recognized for swimming pool pumps, filters & chlorinators (includes hot tubs & spas) up to 60ºC
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UL1081
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7151
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80 +/-5
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-30
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180
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General purpose, recommended for freon applications
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Return to top
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| EPDM: Ethylene Proplyene Diene Terpolymer |
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| EPDM is ideal for outdoor applications because of its excellent resistance to ozone, oxidants and severe weather conditions. Other outstanding characteristics of EPDM include heat resistance and dielectric qualities. EPDM offers many of the advantages of Chloroprene, at a lower cost. EPDM has excellent weather resistance but very poor resistance to petroleum oils. They have high tear, high tensile strength and excellent dynamic and low temp properties. Commonly used as roofing, radiator gaskets and hoses, brake components and pond liners. |
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Advantages:
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Low temperature properties, ozone resistance, water resistance, electrical properties |
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Disadvantages:
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Fuel and oil resistance, abrasion resistance |
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Material
Code
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Hardness
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Lower
Temperature
Limit (ºF)
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Upper
Temperature
Limit (ºF)
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Comments
|
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Specifications Met
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Shore A
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7161
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50 +/-5
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-45
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250
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General purpose
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7172
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55 +/-5
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-40
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250
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NSF-61
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7175
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60 +/-5
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-40
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250
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General purpose
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7173
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65 +/-5
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-40
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250
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NSF-61
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7176
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70 +/-5
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-50
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250
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General purpose
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7180
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70 +/-5
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-40
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250
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FDA 21CFR177.2600 & 21CFR182.5991, USP Class 6
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7158
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75 +/-5
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-40
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250
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FDA 21CFR177.2600 & 21CFR182.5991
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7181
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80 +/-5
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-50
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250
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Approved for atomic energy applications
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NAS 1613 (o-rings), MIL-G-22050, GRADE 2 (sealing strips)
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7182
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80 +/-5
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-50
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250
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General purpose
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7157
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85 +/-5
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-40
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250
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Friction reducers added
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Return to top
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| FFKM: Perfluoro-elastomer (Kalrez®) |
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| FFKM offers superior chemical compatibility coupled with outstanding steam resistance. It’s resistant to almost every chemical compound, including fuels, ketones, esters, alkalines, alcohols, aldehydes and both organic and inorganic acids. They feature both the chemical resistance of Teflon® and the high temperature stability of a fluoroelastomer like Viton®. Resistant to over 1,600 solvents, chemicals, and plasmas, they exhibit minimal swell and can function in almost any chemical or petrochemical situation. Most commonly seen in oilfield exploration and refining industries as well as chemical processing and pharmaceutical mixing. |
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Kalrez® is a registered trademark of DuPont.
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Advantages:
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These are extreme elastomers that will perform in extreme conditions |
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Disadvantages:
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High cost |
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Material
Code
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Hardness
|
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Lower
Temperature
Limit (ºF)
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Upper
Temperature
Limit (ºF)
|
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Comments
|
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Specifications Met
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Shore A
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7193
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85 +/-10
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-4
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550
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High temperature applications
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Return to top
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| FKM: Fluorocarbon (Viton®) |
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| Fluorocarbon elastomers make excellent general-purpose seals due to their exceptional resistance to chemicals, oil, and temperature extremes. They usually have good compression set resistance, low gas permeability and resistance to ozone and sunlight. FKM compounds are commonly used in the automotive, appliance, fluid power and chemical processing industries; high temp oil seals, fuel filters and diaphragms. |
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Viton® is a registered trademark of DuPont.
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Advantages:
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Great heat resistance, excellent permeation to fuels, inertness to many chemicals |
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Disadvantages:
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High cost, not very good low temp. flexibility |
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Material
Code
|
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Hardness
|
|
Lower
Temperature
Limit (ºF)
|
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Upper
Temperature
Limit (ºF)
|
|
Comments
|
|
Specifications Met
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Shore A
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7005
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65 +/-5
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-15
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400
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General purpose
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7002
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70 +/-5
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-20
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400
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FDA 21CFR177.2600 & 21CFR182.5991
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7001
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75 +/-5
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-40
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400
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Friction reducers added
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7003
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75 +/-5
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-20
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400
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Approved for atomic energy applications
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MIL-R-83248 Type 1, Class 1
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7024
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75 +/-5
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-10
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400
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Recommended for high speed aircraft applications
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Government S188
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7028
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75 +/-5
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-65
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400
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Good low temperature capabilities
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MIL-S-45005
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7023
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75 +/-5
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-15
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400
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UL-778 max 56ºC rise, NSF-61max use temperature 23ºC max
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7018
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80 +/-5
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-15
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400
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UL157 (LPG, etc.), UL430 (disposers to 105ºC), UL778 (water pumps to 105ºC), UL1081 (swimming pool pumps, etc.), FDA code 21CFR177.2600, 21CFR182.5991, 21CFR184.1205, 3A-Sanitary Class I
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7019
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80 +/-5
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-20
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400
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MIL-R-83248 Type 1, Class 1
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7030
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80 +/-5
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-20
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400
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General purpose
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7033
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85 +/-5
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-15
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400
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Friction reducers added
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7035
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85 +/-5
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-15
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400
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General purpose
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7031
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85 +/-5
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-20
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400
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UL157 Gasoline, gasoline/alcohol blends (ethanol & methanol) up to 20%, diesel fuel, kerosene, naptha, lubrication oils, fuel oils at ambient temperatures, fuel oil #6 up to 250ºF
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7015
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90 +/-5
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-20
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400
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Recommended for aerospace applications
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MIL-R-83248 Type 1, Class 2
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Return to top
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| FXM: Tetrafluoroethylene Propylene (Aflas®) |
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| This family of elastomers is a cousin to the fluorocarbons (FKM’s). They provide a unique combination of chemical, heat and electrical resistance. Chemically, they resist acids and bases, as well as steam, amine-based corrosion inhibitors, hydraulic fluids, alcohol and petroleum fluids. They are also resistant to ozone and weather. It retains its remarkable chemical resistance even in high temperatures, and tests have shown that electrical resistance actually improves with heat exposure. Commonly used in sour gas oilfield applications as well as base resistant applications. |
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Aflas® is a registered trademark of the Asahi Glass Co., Ltd.
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Advantages:
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Physical properties do well at high temperatures, chemical resistance |
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Disadvantages:
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Not a good low temperature material |
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Material
Code
|
|
Hardness
|
|
Lower
Temperature
Limit (ºF)
|
|
Upper
Temperature
Limit (ºF)
|
|
Comments
|
|
Specifications Met
|
|
|
Shore A
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7008
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75 +/-5
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-20
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400
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General purpose
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7021
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85 +/-5
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-20
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400
|
|
General purpose
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Return to top
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| HNBR: Hydrogenated Acrylonitrile |
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| Compounded HNBR yields high tensile properties, low compression set, good low temperature properties, heat resistance, excellent ozone resistance, good resistance to aggressive oils, resistance to crude oil in the presence of hydrogen sulfide and amines and resistance to alkaline and oxidizing media. HNBR is used in fuel parts due to its increased resistance to sour gasoline and ozone and oil line parts thanks to its resistance to elevated temperatures, oil additives and copper-containing metal sludge. HNBR is also used in automotive air conditioning systems. It’s commonly used in a variety of automotive (oil, fuel, and ac) and oilfield applications. |
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Advantages:
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Good fuel and petroleum resistance, heat, and inertness to many chemicals |
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Disadvantages:
|
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Higher cost that NBR |
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Material
Code
|
|
Hardness
|
|
Lower
Temperature
Limit (ºF)
|
|
Upper
Temperature
Limit (ºF)
|
|
Comments
|
|
Specifications Met
|
|
|
Shore A
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7107
|
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65 +/-5
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-20
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300
|
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General purpose
|
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7106
|
|
70 +/-5
|
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-20
|
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300
|
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General purpose
|
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7108
|
|
75 +/-5
|
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-15
|
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