RUBRINGS / MATERIAL SELECTION
Six materials.
Different responsibilities.
A practical starting point for choosing an O-ring material.
Choose around the operating conditions.
Begin with the fluid, temperature, pressure and movement. Use these to shortlist a material family, then verify the actual compound.
| Material | Often considered for | Check carefully |
|---|---|---|
| NBR | Oils & hydraulics | Check fuel formulation, operating temperature and ozone exposure. |
| HNBR | Heat & mechanical duty | Verify the exact fluid, compound grade and operating temperature. |
| FKM | Heat & chemicals | Check the exact chemical, concentration and low-temperature requirements. |
| EPDM | Water & weather | Generally unsuitable for petroleum oils and fuels. |
| VMQ | Static & temperature | Evaluate tear strength, abrasion and any required contact approvals. |
| CR | Weather & general sealing | Confirm fluid compatibility and any refrigerant or lubricant pairing. |
Ask for the compound datasheet
Polymer names describe families. Formulation and curing affect performance. Specify a compound code where possible and confirm the test conditions behind any quoted temperature range.
Approvals must match the application
Food contact, drinking water and medical uses require relevant documentation for the specific compound and intended use. Material colour or the word “silicone” is not evidence of approval.
Validate before release
Check dimensional fit, material identity, traceability and required inspection records. Evaluate a sample in representative conditions before approving a critical application.
Background references: Parker O-Ring Handbook and Trelleborg material and standards overview. All guidance here is general; it is not a Rubrings supply specification.
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