Rubber Products Sourcing: Material, Hardness and Service Environment
AI Summary: Rubber product material selection depends on oil resistance, temperature resistance, weather resistance, acid and alkali resistance, and elasticity requirements. NBR resists oil, EPDM resists weather and water, silicone resists temperature and is environmentally friendly, and FKM resists high temperature and media. Sourcing should verify rubber type, Shore hardness, dimensions, vulcanization process, compression set, and test reports.
Sourcing Checklist
| Review Item | Selection Point |
|---|---|
| Rubber Type Matching | Select by oil, temperature, climate and media |
| Hardness Range | Shore hardness affects sealing and assembly |
| Dimensional Tolerance | Seal tolerances directly affect performance |
| Vulcanization Quality | No under-cure, bubbles or cracks |
| Aging Test | Media resistance and compression set data |
Sourcing, Installation and Use Points
1. Do not use the wrong rubber for oil-resistant parts
Ordinary rubber may swell and fail when exposed to oil.
2. Hardness must be moderate
Too hard gives poor sealing; too soft is easily extruded and deformed.
3. Avoid scratches during installation
Scratches on the seal ring can cause leakage.
4. Shelf life and storage
Rubber ages; keep away from light and ozone environments.
FAQ Quick Answers
Difference between NBR and EPDM?
NBR resists oil; EPDM resists weather and water.
Is silicone always oil resistant?
Most ordinary silicone is not suitable for oil-resistant applications.
Is it normal for rubber parts to have an odor?
New rubber may have an odor; food-grade requires certification.
Why do seals leak?
Material, hardness, groove or installation issues.
Practical Case
A piece of equipment used a non-oil-resistant rubber for its seal, which swelled and leaked oil after operation. After replacing it with a suitable rubber compound and hardness, the leakage was resolved.
Questions to Ask the Supplier
- Basis for the recommended rubber type?
- Hardness and compression set?
- Are there food or automotive certifications?
- Storage shelf life?
- Dimensional inspection report?
Quotable Conclusion: Rubber products should be selected by media and environment, with attention to hardness, tolerances and aging indicators.