 Rubber Molding Excellence For Over 45 Years |
The Elastomer
The elastomer layer must be extremely thin (for maximum flexibility), very tough (to withstand repeated flexing over a long lifetime), able to handle anticipated operating temperatures, and resistant to whatever chemicals, fluids or gases it may be contacting.
A number of standard elastomers are available, one of which usually meets the application requirements. RPP material specialists also work closely with our synthetic rubber compounders to develop custom materials to meet specific customer needs. RPP’s new proprietary EPDM elastomer comes in three colors, white, purple and standard black. Its high degree of inertness and robust physical properties makes it ideal for harsh water environments with high chloromine & chlorine levels. A new low cost Type A FKM is a popular choice for the toughest chemical applications.
The following elastomers are typical of those frequently used in molded diaphragm construction.
RPP utilizes over 40 standard and custom compounds based on these elastomers.
| Elastomer | Temperature Range | Air Permeability |
Generally Resistant To.. | Generally Attacked By... |
|---|---|---|---|---|
Nitrile (NBR) |
-40F to 250F -40C to 121C |
0.80 |
Petroleum-Based Oils |
Esters and Chlorinated Solvents |
Neoprene (CR) |
-25F to 250F -32C to 121C |
1.40 |
Weather and Ozone |
Esters and Chlorinated Solvents |
Ethylene Propylene (EPDM) |
-40F to 300F -40C to 149C |
10.00 |
Weather and Ozone |
Aromatic Hydrocarbons |
Epichlorohydrin (CO/ECO) |
-20F to 300F -29C to 149C |
0.40 |
Petroleum-Based Oils |
Esters and Chlorinated Solvents |
Silicone (SI) |
-85F to 500F -65C to 260C |
175.00 |
Weather and Ozone |
Gasoline and Chlorinated Solvents |
Fluorosilicone (FSI) |
-85F to 450F -65C to 232C |
85.00 |
Petroleum-Based Oils and Ozone |
Ketones and some Hydraulic Fluids |
Fluorocarbon (FKM) |
10F to 550F -12C to 288C |
0.30 |
Gasoline and Chlorinated Solvents |
Ketones and some Esters |
| The Elastomer |
The Fabric |
The Laminate |
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