Custom Compound Development: How RubberQ Approaches Non-Standard Requests
Problem Statement
EPDM seals in EV battery cooling systems degrade after 500 hours at 150°C due to glycol-based coolant permeation. Standard EPDM compounds exhibit 40% compression set and 15% volume swell under these conditions.
Material Science Analysis
Glycol permeation causes polymer chain scission in EPDM’s diene backbone. RubberQ’s HNBR compound uses 36% acrylonitrile content and peroxide curing to:
- Reduce glycol absorption by 62% versus standard EPDM
- Maintain crosslink density above 4.5×10-4 mol/cm3 at 150°C
- Prevent backbone degradation through saturated hydrocarbon structure
Technical Specifications
| Parameter | HNBR-X7 (RubberQ) | Standard EPDM | FKM (GFLT) |
|---|---|---|---|
| Shore A Hardness | 75 ±3 | 70 ±5 | 75 ±2 |
| Tensile Strength (MPa) | 22.4 | 16.8 | 18.5 |
| Elongation at Break (%) | 310 | 350 | 200 |
| Continuous Service Temp (°C) | -40 to +175 | -50 to +150 | -20 to +200 |
| Compression Set (70h/150°C, %) | 18 | 40 | 12 |
| Glycol Volume Swell (168h/150°C, %) | 5.2 | 15.1 | 3.8 |
Standard Compliance
RubberQ’s IATF 16949 system ensures:
- Batch-to-batch viscosity variation <5% (ASTM D1646)
- Metal bond strength >3.5 MPa (ASTM D429 Method B)
- Cleanliness Class A per ISO 16232 for all molded parts
For custom material compound development or IATF 16949 documentation, consult RubberQ’s engineering department.
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