Lecture 16

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Rubber Basics : Fluoroelastomers• Many of the desirable properties of flouropolymers– Low solvent effects• Excellent for chemical and petroleum handling applications– High thermal stability• Good for gaskets and seals
Rubber Polymer type : Fluorocarbon Rubber2.3.9 Fluorocarbon rubber FKM (FPM)In the United States fluorocarbon rubber is well known by its trade name of VitonBased on vinylidene fluoride and hexafluoro-propylene• Like silicone rubber, FKM has excellent high temperature resistance with an uppercontinuous heat aging temperature limit of 205 deg C.• FKM is usually serviceable at temperatures down to -20 deg C in dynamic applications,while for static use the temperature can be lower.• A primary variable in FKM grades is the level of fluorine in the elastomer molecule,FKMs being fluorohydrocarbons . Terpolymers tend to have a higher fluorine contentthan copolymers excellent resistance to oxidation, ozone, fuels and petroleum oils andare resistant to most mineral acids at high concentrations.• Although FKM has good resistance to many chemicals, excessive swelling occurs insome polar solvents such as low molecular weight ethers, esters and ketones.• Chemicals such as alkalis and amines should be used with caution, with standardfluorocarbon grades,.• FKM has a tendency to self extinguish when a flame is removed• Applications for FKM include automotive fuel hose liners and seals and flue ductexpansion joints, where high temperatures and acidic exhaust is present.• The relative cost of FKM is high, more than any of the elastomers mentioned so far,also a high specific gravity (around 1.8) means less cured product (volume) per unitweight
Page 4 and 5: Rubber - Effect of Vulcanizing
Page 6 and 7: Rubber Polymer Type : Natural Rubbe
Page 9 and 10: Rubber Polymer type : Nitrile Rubbe
Page 11 and 12: Rubber Polymer type : EPDM Rubber2.
Page 13: Rubber Basics : FluoroelastomersHHF
Page 17 and 18: Rubber Polymer type : Silicone Rubb
Page 19 and 20: Rubber Polymer type : Trade Names
Page 21 and 22: SAE J200 Rubber Classification
Page 23 and 24: SAE J200 Rubber Classification
Page 25 and 26: Typical Rubber Compound Ingredients
Page 27 and 28: Rubber Compounding Ingredients : Cr
Page 29 and 30: Rubber Compounding Ingredients : Ac
Page 31 and 32: Rubber Compounding Ingredients : Fi
Page 33 and 34: Rubber Product : TiresBuilding the
Page 35 and 36: Rubber Belts for Conveyors and Pull
Page 37: Rubber Product : Compression Mouldi

Lecture 16

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