Custom NBR/EPDM Blend for Multi-Fluid Sealing Application
Challenge · Solution · Result
Hydraulic system OEM needed a single gasket compound that resisted both petroleum-based hydraulic oil (requiring NBR) and water-glycol coolant (requiring EPDM) — contradictory chemistry requirements.
Developed proprietary NBR/EPDM blend with compatibilizer additive package. Screened 8 formulations via fluid immersion matrix test. Final compound achieved balanced resistance across both media.
Volume swell: <8% in petroleum oil AND <12% in water-glycol after 1000h immersion. Shore A change <5 points in both fluids. Design lifetime 5 years validated per SAE J200.
Engineering Insights
DFM Analysis & Process Optimization
DFM Analysis: Compound mixing homogeneity verified via SEM cross-section — confirmed uniform phase distribution eliminating hot spots of pure NBR or EPDM domains.
Our engineers work from your CAD drawings before any tooling begins — identifying potential failure modes, proposing material alternatives, and validating gate/cooling layouts digitally. This eliminates costly mold revision cycles.
Empirical Test Data
Physical test results from production samples — available with every shipment on request.
| Test Fluid | Volume Swell Target | Achieved |
|---|---|---|
| Petroleum Hydraulic Oil | < 10% | 7.2% |
| Water-Glycol Coolant | < 15% | 11.8% |
| Shore A Change (1000h) | < 8 points | 4 points |
| Service Life Target | 5 years | SAE J200 Validated |
Get an Engineering Quote Within 24 Hours
Share your drawings, quantity and material requirements. Our team performs a complimentary DFM review before quoting.
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