Item 1325
OTHER: Mechanical -
Bearing - Elastomeric - Elastomer
What is an elastomeric compound?
An elastomer is any type of polymer that has rubber-like properties. An elastomeric compound, consisting of a base polymer and other ingredients, is a material that is designed to meet specific functional requirements. The following ingredients "make up the recipe":
• Polymers the basic gum-like component of a compound, provide certain chemical and mechanical properties in the final product.
• Fillers are reinforcing agents that enhance chemical and mechanical properties.
• Vulcanization agents cross-link the polymer.
• Accelerators modify the rate of vulcanization.
• Activators initiate vulcanization.
• Plasticizers soften or improve processing.
• Processing aids ease handling during mixing, extrusion, calendering or molding.
• Age-resistors reduce or retard aging.
• Misc. ingredients such as blowing agents, pigments, retarders, and odorants have specific purposes but are not necessarily required.
Elastomer Reference Chart
The following guide includes typical polymers currently used in the formulation of compounds for Vernay’s major product categories. Listed are the common name, ASTM designation and corresponding VL (Vernay Laboratories) compound number. Our compounding and processing capabilities are not limited to the elastomers listed here.
Nitrile, NBR (VL000 to –100 Compounds)
Hardness, Shore A 40-100
Service Temperature -40ºC to 130ºC
Very good oil resistance
Good to excellent abrasion resistance
Good to excellent water resistance
Low permeability to gases
Butyl, IIR (VL200 Compounds)
Hardness, Shore A 30-100
Service Temperature -50ºC to 150ºC
Very low permeability to gases (particularly air)
Good to excellent ozone resistance
Good to excellent resistance to oxidation
Good resistance to inorganic chemicals,
Acids and alkalies
Good weather resistance
Styrene-butadiene, SBR (VL300 Compounds)
Hardness, Shore A 35-90
Service Temperature -50ºC to 125ºC
General purpose compound
Very good abrasion resistance
Good water resistance
Good resilience
Polyurethane, AU/EU (VL400 Compounds)
Hardness, Shore A 40-100
Service Temperature -30ºC to 120ºC
Excellent abrasion resistance
Very good physical properties
Good tear resistance
Good weather and ozone resistance
Polyacrylate, Acrylic, ACM/AEM/ANM (VL500 Compounds)
Hardness, Shore A 40-90
Service Temperature -30ºC to 170ºC
Very good oil resistance
Good to excellent ozone and weather resistance
Broad hydrocarbon fluid resistance
Polyisoprene - Natural, NR (VL600 Compounds)
Hardness, Shore A 30-100
Service Temperature -60ºC to 100ºC
General purpose compound
Low hysteresis (low heat build-up)
Excellent resilience
Very good abrasion resistance
Very good water and tear resistance
Polyisoprene - Synthetic, IR (VL600 Compounds)
Hardness, Shore A 35-95
Service Temperature -55ºC to 100ºC
General purpose compound
Low hysteresis (low heat build-up)
Excellent resilience
Very good abrasion resistance
Very good water and tear resistance
Chloroprene, CR (VL800 Compounds)
Hardness, Shore A 30-100
Service Temperature -50ºC to 100ºC
Excellent resistance to ozone
Excellent abrasion resistance
Very good resistance to weathering
Good resistance to oils, acids and alkalies
Silicone, PVMQ, MQ, VMQ (VL1000 Compounds)
Hardness, Shore A 15-90
Service Temperature -80ºC to 260ºC
Excellent ozone resistance
Excellent resistance to oxidation
Very good water resistance
Fluorosilicone, FVMQ (VL1400 Compounds)
Hardness, Shore A 30-90
Service Temperature -60ºC to 225ºC
Excellent ozone resistance
Excellent resistance to oxidation
Very good oil resistance
Good to very good fuel resistance
Good water resistance
Fluorocarbon, FKM (VL1500 Compounds)
Hardness, Shore A 55-95
Service Temperature -30ºC to 260ºC
Excellent resistance to fuels
Excellent resistance to oils, ozone and oxygen
Excellent abrasion resistance
Ethylene Propylene, EPDM (VL1700 Compounds)
Hardness, Shore A 30-100
Service Temperature -60ºC to 155ºC
Excellent resistance to ozone and water
Excellent resistance to oxygenated solvents
Good to excellent resistance to acids and alkalies
Epichlorohydrin, CO/ECO (VL1900 Compounds)
Hardness, Shore A 30-95
Service Temperature -30ºC to 135ºC
Excellent weather resistance
Very good oil resistance
Good to very good fuel resistance
Low permeability to gases
Hydrogenated Nitrile, HNBR (VL2700 Compounds)
Hardness, Shore A 50-100
Service Temperature -40ºC to 150ºC
Good resistance to oxidation
Good ozone resistance
Good water and oil resistance
Note:
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Elastomeric Material:
Rotorway refers to the elastomeric as 'rubber'.
Lord refers to natural rubber. It then talks about its SPE II (perhaps SPET II) to improve the fatigue life by 2:1 and the low temperature stiffening.
ELASTOMERIC MATERIALS
You can select from a broad choice of materials that will provide the compound best suited to your product application.
Some examples are:
Materials:
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Elastomers: ~ Resilient Materials |
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thermosetting resins |
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rubber |
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latex rubber |
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Teflon?? (used in bridge construction) |
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Fabrica (used in bridge construction) |
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Polyurethane?? |
Elastomers:
Use of Latex: by GR
I don't have any specific data on latex but have used it on a product I manufactured long ago. Latex absorbs any oils or even glycerin you put on it so it has to be left dry. Any oils of any kind make it swell. Latex is the only rubber with 750% stretch so it makes it ideal for elastomeric bearings. There are a few other rubbers that might work but latex is in a class all by itself in the stretch department.
The only real problem left is going to be finding the right glue system.
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Last Revised: April 10, 2011