1、Elastomer Classification
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Elastomers are divided into groups as per ISO 1629 or ASTM.We can offer you a large number of materials within each group.
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| Group | Chemical Term | Trade Name | ISO 1629 | ASTM? Abbreviations |
| M | Polyacrylate Rubber | Hytemp, Noxtite, Nipol AR | ACM | ACM |
| Ethylene Propylene Diene Rubber | Keltan, Vistalon, Buna EP | EPDM | EPDM, EP, EPT, EPR | |
| Fluorocarbon Rubber | Fluorel, Tecnoflon, Viton | FKM | FKM | |
| O | Epichlorohydrin | Gechron, Hydrin | ECO | ECO/CO |
| R | Chloroprene Rubber | Baypren, Neoprene | CR | CR |
| Butyl Rubber | Esso Butyl | IIR | IIR | |
| Nitrile Rubber (Acrylonitrile-Butadiene Rubber) | Krynac, Buna-N, Nipol N, Breon | NBR | NBR | |
| Natural Rubber | ? | NR | NR | |
| Styrene-Butadiene Rubber | Buna S, Europrene, Polysar S | SBR | SBR | |
| Hydrogenated Acrylonitrile-Butadiene Rubber | Therban, Zetpol | HNBR | HNBR | |
| O | Fluorosilicone Rubber | Silastic | FVMQ | FVMQ |
| Silicone Rubber | Elastoseal, Silastic, Silopren | VMQ | VMQ, PMQ, PVMQ | |
| U | Polyester Urethane, Polyether Urethane | Zurcon, Adiprene, Vulcollan, Desmopan | AU, EU | AU, EU |
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2、Some introduction to rubber
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Chloroprene Rubber (CR)? ???? ? ? ? ?-40°~100℃? ? ? ?Special Compound? ?-55°~125°C
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? -40°~212°F? ? ? ?Special Compound? ?-67°~257°F??
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| General Information ASTM D2000 SAE J 200 Codes? ? ? ? ? ?BC, BE Relative Cost? ? ? ? ? ? ? ? ?Low Primary Uses Refrigeration industry applications General purpose seals, hose and wire Performs Well in... Refrigerants - Freon? Ammonia Water and water solvents at low temperatures Silicone grease and oils Ozone, aging & weathering |
Description CR, one of the first synthetic rubbers for seals, is often called Neoprene. It’s a chloroprene (chlorobutadiene) homopolymer, unique for moderate petroleum/weather (ozone, UV, O?) resistance. As a general elastomer, it has low compression set, good resilience/abrasion, and flex-crack resistance. Application Advantages Moderate petroleum/weather, good ozone/UV/O?, excellent Freon?/ammonia resistance Limitations In O-rings, Neoprene is mostly replaced by Nitrile: Nitrile is economically competitive, performs better in most situations, and has moderate water resistance. |
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| Epichlorohydrin (CO, ECO, GECO)?? ? ? ? ? ?°C: -40°~125°C; Special Compound: -40°~135°C ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? °F: -40°~257°F; Special Compound: -40°~257°F |
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| General Information ASTM D2000 SAE J 200 Codes: CH Relative Cost: Medium Primary Uses Automotive: Fuel pump diaphragms, hoses, motor mounts, boots, seals General industrial use Medical: Oxygen mask hoses Performs Well in... Mineral oil and grease LPG, fuels Silicone oil and grease Ozone and weathering |
Description Epichlorohydrin is available in three types: the homopolymer (CO), the copolymer (ECO), and the terpolymer (GECO). Application Advantages Resistant to ozone, weathering and oils Good heat resistance Very low permeability to gas Limitations Compounds from this polymer can exhibit a corrosive nature and can be difficult to process in manufacturing. Compression set is only "fair" at elevated temperatures (120° to 135°C, 250° to 275°F). |
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3、How to select rubber materials.
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When selecting rubber materials for sealing, there are a number of important selection criteria to be considered:
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1
The service conditions to be considered include
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1) Fluid to be sealed?
2) Temperature range?
3) Pressure range?
4) Motion - either static or dynamic.
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2
The design requirements to be considered include
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1) Component geometry/description, like O - ring, gasket, diaphragm, etc.?
2) The effect of chemical/fluid media on the seal.?
3) Desired service life. Find out the reason and which material was used for a failed seal.?
4) Lubrication level and assembly methods, including lubricants, installed stretch, etc.?
5) Critical dimensions and tolerances, including groove dimensions and machining tolerances.
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3
The inspection requirements to be considered include
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1) Defining inspection criteria.?
2) Determining the need for lot sampling.?
3) Setting acceptable quality levels (AQLs).?
4) Indicating the critical sealing surface.
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4
The selection of material specification
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1) Define material specifications, such as the American ASTM, German DIN, Japanese JIS, Chinese GB.?
2) Discuss with your supplier to specify sealing materials.?
3) Choose suppliers with stable quality and delivery.
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5
Select suitable rather than high - cost and impractical rubber materials.?
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Natural or synthetic rubber has key properties: springs back when pressed, resists bending/squeezing, and blocks gas/liquid well. Each type has unique traits; experts mix it specifically for engineering needs. Curing turns soft, moldable rubber into hard, shaped, form-holding rubber. Crosslinking gives it strength and stretch for good sealing. |
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