PPAP Level 3: Why Documentation is as Important as the Part Itself
Problem Statement: Compression Set Failure in High-Temperature Seals
Automotive turbocharger seals require stable performance at 200°C and 15 bar pressure. Standard NBR compounds degrade rapidly, losing >40% sealing force after 500 thermal cycles due to polymer chain scission.
Material Science Analysis
FKM outperforms NBR and EPDM in this application due to:
- Fluorine-carbon bonds (68% fluorine content) resist thermal oxidation
- Crosslink density maintains compression set below 20% at 200°C
- ASTM D2000 M6HK 814 A25 B25 E25 F25 classification
Technical Specifications
| Parameter | FKM (Recommended) | NBR (Alternative 1) | EPDM (Alternative 2) |
|---|---|---|---|
| Shore A Hardness | 75 ±5 | 70 ±5 | 65 ±5 |
| Tensile Strength (MPa) | 18.5 | 14.2 | 9.8 |
| Elongation at Break (%) | 220 | 350 | 400 |
| Compression Set (%, 22h @ 200°C) | 18 | 65 | 45 |
| Continuous Use Temp (°C) | -20 to +230 | -30 to +120 | -50 to +150 |
Standard Compliance
RubberQ’s IATF 16949 system ensures:
- Full PPAP Level 3 documentation (Process Flow, PFMEA, Control Plans)
- ISO 16232 cleanliness reports for all molded parts
- ASTM D429 adhesion testing for bonded components
- Lot traceability down to raw material batch numbers
For custom material compound development or IATF 16949 documentation, consult RubberQ’s engineering department.
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