When selecting high-temperature coatings, focus on performance specifications, not price. Here are 12 critical features that determine real-world durability.
1. Temperature Rating (Continuous Service, Not Maximum)
Specify continuous service temperature, not headline maximum. Safe operating temperature is typically 500–1,000°F below maximum rating.
2. Thermal Cycling Test Data
Demand ASTM D2305 or equivalent thermal cycling test results (minimum 500 cycles). Most failures occur under thermal cycling, not static high temperature.
3. Adhesion Specification (ASTM D4541)
Minimum adhesive pull-strength >1.0 MPa. Adhesion retention after thermal cycling >80%. Poor adhesion guarantees peeling.
4. Environmental Resistance
Oil resistance, coolant resistance, salt-fog performance per ASTM standards. Generic claims without test data are unreliable.
5. Coefficient of Thermal Expansion (CTE)
CTE 30–45 ppm/°C optimal. Higher CTE (50–70 ppm/°C) creates differential expansion stress; lower CTE increases cost unnecessarily.
6. Moisture Absorption
<0.5% moisture absorption (ASTM D570). High moisture absorption enables under-coating corrosion.
7. Cure Protocol (Room Temperature and Heat-Accelerated Options)
Specify which cure method works for your schedule. Room-temperature cure develops better properties; heat-accelerated cure faster but potentially inferior.
8. Dielectric Strength (If High-Voltage Application)
15 kV/mm at 23°C, >10 kV/mm at operating temperature. Critical for electrical safety.
9. Elastomer Content (For Cycling Applications)
8–12% elastomer for vibration and thermal cycling tolerance. Rigid coatings crack under cycling.
10. Pre-Treatment Compatibility
Verify primer or conversion coating compatibility. Generic coatings may not work with all pre-treatments.
11. Field Validation Data
Request references from similar applications. Field-proven performance trumps lab data.
12. Technical Support and Documentation
Complete data sheets with test results, SDS, processing guides, and responsive technical support.
Buying Decision Framework
- Specify performance requirements (temperature, cycling, environment)
- Request complete technical data (not sales brochures)
- Verify thermal cycling and adhesion test data
- Confirm cost vs. durability (cheap coatings fail prematurely)
- Prototype and validate before full production commitment
Don’t buy based on price alone. Lower-cost coatings fail prematurely, costing far more in rework and warranty.
Incure provides complete technical specifications for all coatings, with published test data validating performance claims.
Email Us to receive technical specifications and buying guidance for high-temperature coatings.
Visit www.incurelab.com for more information.