What is PEEK CM natural?
PEEK CM natural is an unfilled polyetheretherketone compression moulded (CM) into sheets. The compression-moulded premium material is characterised by a very low level of residual stress and a tensile modulus that is higher than that of extruded PEEK – for components with maximum dimensional stability.
Technical data
| Property | Value | Test method |
|---|---|---|
| General Properties | ||
| Density | 1.31 g/cm³ | DIN EN ISO 1183-1 |
| Water absorption | 0.2 % | DIN EN ISO 62 |
| Flammability (Thickness 3 mm / 6 mm) | V0/V0 | UL 94 |
| Mechanical Properties | ||
| Yield stress | 70 MPa | DIN EN ISO 527 |
| Elongation at break | 2 % | DIN EN ISO 527 |
| Tensile modulus of elasticity | 4,100 MPa | DIN EN ISO 527 |
| Ball indentation hardness | 250 MPa | DIN EN ISO 2039-1 |
| Shore hardness | 88 scale D | DIN EN ISO 868 |
| Thermal Properties | ||
| Melting temperature | 343 °C | ISO 11357-3 |
| Thermal conductivity | 0.25 W/(m·K) | DIN 52612-1 |
| Thermal capacity | 1.34 kJ/(kg·K) | DIN 52612 |
| Coefficient of linear thermal expansion | 50 ·10⁻⁶/K | DIN 53752 |
| Service temperature, long term | -60 to 250 °C | Average |
| Service temperature, short term (max.) | 310 °C | Average |
| Heat deflection temperature | 152 °C | DIN EN ISO 75, method A, HDT |
PEEK CM natural vs. PEEK natural compared directly
| Property | PEEK CM natural | PEEK natural |
|---|---|---|
| Density | 1.31 g/cm³ | 1.31 g/cm³ |
| Yield stress | 70 MPa | 110 MPa |
| Elongation at break | 2 % | 20 % |
| Tensile modulus of elasticity | 4,100 MPa | 4000 MPa |
| Shore hardness | 88 scale D | 88 scale D |
| Heat deflection temperature | 152 °C | 152 °C |
| Service temperature, long term | -60 to 250 °C | -60 to 250 °C |
PEEK CM natural in detail
1What is PEEK CM natural?+
PEEK CM natural is an unfilled polyetheretherketone compression moulded (CM) into sheets. The compression-moulded premium material is characterised by a very low level of residual stress and a tensile modulus that is higher than that of extruded PEEK – for components with maximum dimensional stability. Compression moulding produces an isotropic, low-stress structure, so that even large-area, thin-walled or heavily milled components can be produced with low distortion. The material combines high stiffness and hardness with very good resistance to chemicals, hydrolysis and radiation, and is flame retardant (UL 94 V0) with low smoke density.
2How does Liedtke machine PEEK CM natural?+
PEEK CM natural can be machined using all conventional cutting methods; because of the high hardness, carbide tools with sharp cutting edges are recommended. Good cooling via chip removal remains important to avoid heat build-up and residual stresses in the part. For tight tolerances and thick-walled parts, we recommend intermediate annealing to relieve machining stresses; thanks to the low moisture absorption, no conditioning is required. The compression-moulded sheets are particularly suitable for large-area and delicate machining with low distortion.
3When should I choose PEEK CM natural?+
PEEK CM natural is used wherever extreme dimensional stability and heat deflection temperature are required – for example in aerospace, the semiconductor industry, mechanical engineering and medical technology:
- Precision and structural parts for aerospace
- Wafer handling and process components
- Large-area, low-distortion functional parts
4What determines the price of a PEEK CM natural part?+
PEEK CM natural is calculated individually based on drawing or sample. The part price is determined mainly by the semi-finished form and dimensions, material utilisation and offcuts, machining effort and batch size. We are happy to provide binding prices on request.
5When is PEEK CM natural not the right choice?+
The limits of the material are equally important:
- Lower elongation at break and toughness than extruded PEEK
- High material cost compared to engineering plastics
- Not resistant to concentrated sulphuric acid and some halogenated hydrocarbons
6Advantages and disadvantages of PEEK CM natural+
An honest assessment:
- Advantage: Maximum dimensional stability, very low residual stress
- Advantage: Increased tensile modulus compared to extruded PEEK
- Advantage: Continuous service from -60 to 250 °C, flame retardant
- Advantage: Very good resistance to chemicals, hydrolysis and radiation
- Disadvantage: Lower elongation at break and toughness than extruded PEEK
- Disadvantage: High material cost compared to engineering plastics
- Disadvantage: Not resistant to concentrated sulphuric acid and some halogenated hydrocarbons
Typical properties
- Modified compound with adapted toughness profile
- Very high heat deflection temperature
- Maximum dimensional stability
Typical industries
- Aerospace
- Semiconductor Industry
- Mechanical Engineering
- Medical Technology
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