Thermal Expansion: Dimensional Control and Accuracy
Thermal Stability and Precision: A Challenge for Technical Systems
Industrial environments subject to temperature variations demand stable, precise materials. Low thermal expansion is essential to guarantee dimensional stability, assembly reliability and component life.
Why is the Coefficient of Thermal Expansion critical?
The CTE (Coefficient of Thermal Expansion), expressed in µm/m-°C, determines how a material expands under heat. A high CTE can cause :
- Deformation and loss of tolerance
- Cracks, excessive play or unwanted tightening
- Contact or sealing defects
Low CTE HPPs are ideal for technical assemblies exposed to heat.
DEMGY selection: Low CTE HPP polymers
Fiber-reinforced grades (GF/CF) greatly reduce expansion.
Standard plastics & metals: where are the limits?
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Applications sensitive to thermal expansion
Aerospace
- Structural components, connectors, insulators
- Vespel® SCP-5000: functional from -200 to +300°C
Precision mechanics
- Guide rings, polymer bearings
- Torlon® 4203: rigid, precise, stable
Electronics & connectors
- Circuit supports, housings
- PEEK GF30 / PPS GF40 : thermal compatibility with substrates
Automotive & mobility
- Engine and gearbox components
- Thermal resistance + stability = long-term reliability
DEMGY expertise for your thermal needs
Targeted material advice
- Selection based on CTE, temperature, required rigidity
- Recommended reinforcements (carbon, glass, mineral)
Controlled processing
- Heat-compensated machining & injection
- High-stability additive manufacturing
Dimensional validation
- Cyclic temperature testing
- Shrinkage control, internal voltage
Conclusion
Controlling thermal expansion is an essential lever for the functional performance, geometric precision and reliability of technical parts. Thanks to their low CTE and structural stability when hot, the HPPs selected by DEMGY meet the most demanding requirements.
Associated products