What is HGW 2088?
HGW 2088 (Hgw 2088 acc. to DIN 7735 / PF CC 42 acc. to EN 60893) is the round-bar-specialised grade of the cotton-fabric-laminate family. Unlike the sheet grades HGW 2082 and HGW 2083, HGW 2088 is manufactured by winding: a phenolic-resin-impregnated cotton fabric is wound around a mandrel and then cured.
This winding process is specifically designed for round bars and avoids the anisotropic layer structures that can occur in round bars machined from sheet stock - the result is a more uniform component across the cross-section. The mechanical values are somewhat lower than those of sheet stock, as the wound construction serves different load directions; at 120 °C, the limiting temperature is somewhat higher than for the sheet grades.
Typical applications include sliding bushings and bearing elements, spacers and shafts in mechanical engineering, and insulating round parts in low-voltage electrical engineering. For flat components such as insulating panels, the sheet grades HGW 2082 and HGW 2083 are the more suitable choice.
Technical Data
| Property | Value | Test Standard |
|---|---|---|
| General Properties | ||
| Density | 1.3 g/cm³ (range 1.2-1.4) | DIN 53479 |
| Water absorption (mass fraction) | ≤ 2.4 % | ISO 62 |
| Colour | brown | – |
| Mechanical Properties | ||
| Flexural strength | 100 MPa (DIN 7735 minimum 90 MPa) | DIN 53452 |
| Impact strength | 15 kJ/m² (typical value) | DIN 53453 |
| Notched impact strength | 8 kJ/m² (typical value) | DIN 53453 |
| Tensile strength | 50 MPa (typical value) | DIN 53455 |
| Compressive strength (parallel) | 80 MPa (DIN 7735: 80 MPa) | DIN 53454 |
| Modulus of elasticity | 7000 MPa (typical value) | DIN 53452 |
| Thermal Properties | ||
| Limiting temperature | 120 °C | VDE 0304, T.21 |
| Thermal conductivity | 0.2 W/(m·K) (typical value) | DIN 52612 |
| Thermal class | E | VDE 0534 |
| Electrical Properties | ||
| Electric strength ∥ / ⊥ | 10 / 4.8 kV | DIN 53481 |
| Dielectric constant | 5 (typical value) | DIN 53483 |
| Comparative tracking index CTI | 100 (typical value) | IEC 60112 |
HGW 2088 in detail
1What is HGW 2088?+
HGW 2088 is a wound cotton-fabric laminate with phenolic resin per DIN 7735 / EN 60893 (PF CC 42), specifically designed for the manufacture of round bars. The winding process produces uniform properties across the entire bar cross-section.
2How does Liedtke machine HGW 2088?+
We machine HGW 2088 mainly by turning, but milling and drilling also produce clean, dimensionally accurate results with sharp, carbide-tipped tools. We ensure adequate dust extraction during machining.
3When should I choose HGW 2088?+
HGW 2088 pays off whenever a rotationally symmetric component made from economical fabric laminate is required – for example:
- Sliding bushings and bearing elements
- Spacers and shafts in mechanical engineering
- Insulating round parts in electrical engineering (low voltage)
- Drive technology components with rotationally symmetric geometry
- General mechanical round parts with moderate load
4What determines the price of an HGW 2088 part?+
The component price is determined mainly by bar diameter, length, machining effort and batch size. HGW 2088 is an economical round-bar fabric laminate. We are happy to provide binding prices on request based on your drawing.
5When is HGW 2088 not the right choice?+
HGW 2088 is not declared for direct food contact. For flat components such as insulating panels, the sheet grades HGW 2082 and HGW 2083 are better suited, and the material reaches its limits with high tracking-resistance requirements or continuous use above approximately 120 °C.
6Advantages and disadvantages of HGW 2088+
An honest assessment – and how the disadvantages can be mitigated in practice:
- Advantage: Winding process specifically optimised for round bars
- Advantage: Uniform properties across the cross-section
- Advantage: Economical standard material
- Advantage: Good machinability (especially turning)
- Advantage: Somewhat higher limiting temperature than sheet stock (120 °C)
- Disadvantage: Not declared for direct food contact
- Disadvantage: Lower flexural strength than the sheet grades
- Disadvantage: Only for round-bar geometries, not for sheets
- Disadvantage: Moderate tracking resistance (CTI ~100)
- Disadvantage: Not all properties publicly documented in the same depth as for sheet stock
- Practical tip: HGW 2088 is the right choice for round bars, sliding bushings and shafts made from economical fabric laminate. For flat components such as insulating panels, the sheet grades HGW 2082 and HGW 2083 are the more suitable choice.
Typical Properties
- Wound laminate for round bars
- Uniform properties across cross-section
- Good electrical insulating properties
- Thermoset, dimensionally stable
- Good machinability
- Colour brown
Typical Industries
- Electrical and insulation engineering
- Mechanical and plant engineering
- Drive technology
- Jig and tool making
- Switchgear and equipment manufacturing
- General round-part manufacturing
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