What is PF CC 204?
PF CC 204 (Hgw 2083.5 to DIN 7735, to EN 60893) belongs to the family of fabric-based laminates (industrial laminates): fabric webs are impregnated with a thermoset resin and pressed under heat and pressure into sheets, round bars or tubes. In PF CC 204, the reinforcing material is a fine cotton fabric, and the binding resin is a phenol-formaldehyde resin. The finer fabric lies denser and more evenly than a standard fabric, giving the material higher tensile strength combined with reduced water absorption. Unlike thermoplastics, the cured thermoset does not melt but remains dimensionally stable, hard and mechanically resilient. Its colour is typically brown.
Within the fabric-laminate family to DIN 7735 / EN 60893, PF CC 204 is the fine-fabric-based development of PF CC 202: compared with the standard cotton fabric grade, PF CC 204 achieves significantly higher tensile strength (130 instead of 100 MPa typical) and lower water absorption, at comparable electrical insulation performance and limiting temperature. For applications with particularly high mechanical tensile loading or increased moisture requirements, PF CC 204 is the targeted choice within the cotton fabric series.
Typical applications are components with particularly high mechanical tensile loading, applications with increased moisture requirements, high-voltage-resistant insulating and partition parts in switchgear construction, as well as insulating parts in transformer and motor manufacturing under high mechanical stress.
Technical Data
| Property | Value | Test Standard |
|---|---|---|
| General Properties | ||
| Density | 1.3-1.4 (typically 1.36) g/cm³ | – |
| Water Absorption (5 mm thickness) | 130 (DIN 7735: 110) mg | DIN 53495 |
| Colour | brown | – |
| Mechanical Properties | ||
| Flexural Strength | 170 (DIN 7735: 130) MPa | DIN 53452 |
| Impact Strength | 40 (DIN 7735: 30) kJ/m² | DIN 53453 |
| Notched Impact Strength | 20 (DIN 7735: 15) kJ/m² | DIN 53453 |
| Tensile Strength | 130 (DIN 7735: 80) MPa | DIN 53455 |
| Compressive Strength | 190 (DIN 7735: 150) MPa | DIN 53454 |
| Cleavage Strength | 4000 (DIN 7735: 2500) N | DIN 53463 |
| Modulus of Elasticity | 8 · 10³ (DIN 7735: 7 · 10³) MPa | DIN 53452 |
| Thermal Properties | ||
| Limiting Temperature | 110 °C | VDE 0304 |
| Thermal Conductivity | 0.2 W/(m·K) | DIN 52612 |
| Coefficient of Linear Expansion | 20-40 · 10⁻⁶/K | VDE 0304 |
| Thermal Class | E | VDE 0534 |
| Resistance to Glowing | 2b | DIN 53452 |
| Electrical Properties | ||
| Insulation Resistance | 5 · 10⁷ (DIN 7735: 10⁷) Ω | DIN 53482 |
| Electric Strength ∥ / ⊥ | 30 / 15 (DIN 7735: 25 / 5) kV | DIN 53483 |
| Permittivity | 5 | DIN 53483 |
| Comparative Tracking Index CTI | 100-160 | IEC 112 |
PF CC 204 in detail
1What is PF CC 204?+
PF CC 204 (Hgw 2083.5 to DIN 7735, to EN 60893) is a fine-cotton-fabric-reinforced phenolic laminate. Compared with the standard cotton fabric grade, the finer fabric reinforcement provides higher tensile strength and reduced water absorption at comparable electrical insulation performance.
2How is PF CC 204 machined at Liedtke?+
We machine precision parts from PF CC 204 sheets, round bars or tubes. Sawing, milling, drilling and turning can be carried out cleanly and accurately with sharp, carbide-tipped tools. We ensure adequate dust extraction during machining, as resin and fabric dust is generated.
3When should I choose PF CC 204?+
PF CC 204 is especially suitable for the following applications:
- Components with particularly high mechanical tensile loading
- Applications with increased moisture requirements (reduced water absorption)
- High-voltage-resistant insulating and partition parts in switchgear construction
- Insulating parts in transformer and motor manufacturing under high mechanical stress
4What determines the price of a PF CC 204 part?+
Due to its fine fabric reinforcement, PF CC 204 is priced above the standard cotton fabric grade PF CC 202. The component price is determined mainly by sheet thickness or rod diameter, dimensions, material utilisation (offcuts), machining effort and batch size. We are happy to provide binding prices on request based on your drawing.
5When is PF CC 204 not the right choice?+
PF CC 204 is not declared suitable for direct food contact. For economical standard applications without increased tensile-strength or moisture requirements, PF CC 202 is sufficient, and a simpler phenolic paper laminate suffices where there is no high-voltage requirement. The material is not suitable for continuous use above approximately 110 °C or permanently wet environments.
6Advantages and disadvantages of PF CC 204+
An honest assessment – and how the disadvantages can be mitigated in practice:
- Advantage: High tensile strength
- Advantage: Reduced water absorption compared with standard cotton fabric
- Advantage: High-voltage resistant
- Advantage: Thermoset, dimensionally stable
- Disadvantage: Not declared suitable for direct food contact
- Disadvantage: More expensive than the standard cotton fabric grade PF CC 202
- Disadvantage: Continuous use limited to approx. 110 °C
- Disadvantage: Fabric reinforcement still absorbs some moisture, though reduced
Typical Properties
- Fine-cotton-fabric-reinforced phenolic laminate
- High tensile strength
- Reduced water absorption
- High-voltage resistant
- Good electrical insulation
- Thermoset laminate (dimensionally stable)
Typical Industries
- High-voltage switchgear engineering
- Electrical engineering and insulation technology
- Transformer and motor manufacturing
- Mechanical engineering
- Jig, fixture and tool making
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