In-House Lab Capabilities: From Rheometers to Tensile Testing Machines
Problem Statement
Rubber components in EV battery cooling systems require precise material characterization. Off-the-shelf compounds often fail due to inconsistent cure kinetics or poor compression set resistance under thermal cycling (150°C to -40°C).
Material Science Analysis
Standard EPDM grades degrade in glycol-based coolants due to insufficient crosslink density. RubberQ’s in-house compounded HNBR (36% acrylonitrile content) resists swelling (<5% volume change) via optimized peroxide curing systems. The lab verifies this through:
- MDR rheometry (ASTM D5289) to track scorch time (ts2) and cure rate
- FTIR spectroscopy to confirm fluorine content in FKM batches
- DSC analysis for Tg and thermal stability thresholds
Technical Specs
- Shore A Hardness: 70±5 (ISO 7619-1)
- Tensile Strength: ≥18 MPa (ASTM D412)
- Elongation at Break: 250-300%
- Temperature Range: -50°C to +175°C continuous
- Compression Set (22h @ 150°C): ≤15% (ASTM D395 Method B)
| Parameter | HNBR (RubberQ Custom) | Standard EPDM | Generic FKM |
|---|---|---|---|
| Glycol Resistance (70°C x 168h) | ΔV +3.2% | ΔV +22% | ΔV +8.5% |
| Tear Strength (kN/m) | 45 | 28 | 38 |
| Compression Set @ 175°C | 18% | 45% | 25% |
| Cost Index | 1.8x | 1.0x | 2.5x |
Standard Compliance
RubberQ’s IATF 16949-certified lab enforces:
- Daily torque rheometer calibration per ISO 9001
- ASTM D2000 material lot traceability
- ISO 3601-1 leak testing for seal validation
For custom material compound development or IATF 16949 documentation, consult RubberQ’s engineering department.
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