Overview
HGW 2572-F4 (acc. to DIN 7735, SI GC 202 acc. to EN 60893) is a glass-fabric-reinforced silicone-resin laminate, technically identical to HGW 2572. The designation "-F4" is a US-market labelling variant of this material and not an independently verified, standalone NEMA standard designation. Glass-fabric layers are impregnated with silicone resin and pressed under heat and pressure into sheets or round bars. Compared with phenolic and epoxy resin, silicone resin offers exceptionally high thermal resistance; the colour is characteristically white.
While epoxy-resin glass laminate (HGW 2372.1) reaches its thermal limit around 130 °C and cotton-fabric laminate around 110-120 °C, HGW 2572-F4 withstands continuous temperatures of up to 180 °C – combined with very high tracking resistance (CTI 600). This is made possible by the silicone-resin matrix, important wherever electrical insulating parts are exposed to high temperature combined with contamination or moisture. As a trade-off, the basic mechanical values are somewhat lower than those of HGW 2372.1.
Typical applications include slot insulation in electric motors and generators, insulating parts in transformer and coil construction, components in heating and thermal engineering, and high-temperature insulating parts in aerospace and rail technology. The material is also used in jig, fixture and tool making wherever high continuous temperature and electrical insulation performance are both required.
Technical Data
| Property | Value | Test Standard |
|---|---|---|
| Mechanical Properties | ||
| Flexural strength | 240 (DIN 7735: 125) MPa | DIN 53452 |
| Impact strength | 95 (DIN 7735: 40) kJ/m² | DIN 53453 |
| Notched impact strength | 60 (DIN 7735: 25) kJ/m² | DIN 53453 |
| Tensile strength | 164 (DIN 7735: 90) MPa | DIN 53455 |
| Compressive strength | 120 (DIN 7735: 50) MPa | DIN 53454 |
| Modulus of elasticity | 19 · 10³ (DIN 7735: 13 · 10³) MPa | DIN 53452 |
| Electrical Properties | ||
| Electric strength ∥ | 30 (DIN 7735: 20) kV | DIN 53481 |
| Dielectric constant | 5 (DIN 7735: 5) | DIN 53483 |
| Comparative tracking index (CTI) | 600 (DIN 7735: 440) | IEC 60112 |
| Thermal Properties | ||
| Limiting temperature | 180 °C | VDE 0304, T.21 |
| Thermal conductivity | 0.3 W/(m·K) | DIN 52612 |
| General Properties | ||
| Density | 1.7 (DIN 7735: 1.6-1.7) g/cm³ | DIN 53479 |
| Water absorption (5 mm thickness) | 13 (DIN 7735: 50) mg | DIN 53495 |
| Colour | white | – |
Frequently Asked Questions about HGW 2572-F4
1What is HGW 2572-F4?+
HGW 2572-F4 (acc. to DIN 7735, SI GC 202 acc. to EN 60893) is a glass-fabric-reinforced silicone-resin laminate, technically identical to HGW 2572. The designation -F4 is a US-market labelling variant of this material and not an independently verified, standalone NEMA standard designation. The material achieves a continuous-use temperature of up to 180 °C combined with very high tracking resistance (CTI 600).
2How does Liedtke machine HGW 2572-F4?+
We machine HGW 2572-F4 into precision parts from sheets and round bars. Sawing, milling, drilling and turning produce clean, dimensionally accurate results with sharp, carbide-tipped or diamond-coated tools. We ensure adequate dust extraction during machining, as resin and glass fibre dust is generated.
3What determines the price of an HGW 2572-F4 part?+
Due to its silicone-resin matrix, HGW 2572-F4 is the premium material among the fabric laminates in Liedtke's range. Component price is mainly determined by sheet thickness, dimensions, material utilisation (offcuts), machining effort and batch size. We are happy to provide binding prices on request based on your drawing.
4When is HGW 2572-F4 not the right choice?+
HGW 2572-F4 is not declared for direct food contact. For applications without particular temperature requirements, an epoxy or cotton-fabric laminate is more economical, and HGW 2372.1 is superior where very high mechanical strength is required. As a thermoset, the material also cannot be reshaped or welded.
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