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Everlite®
Everlite is available in two types of polyurethane foam: polyether-based or polyester-based. The difference is whether the polyol, the main raw material, is ether (single-bonded) or ester (double bonded).
Although they are similar soft polyurethane foams, there are significant differences between them in terms of their properties, and each should be used in the right application.
| General ether form. | General ester forms. | |||
|---|---|---|---|---|
| General physical properties | Density（kg/cm3） | 16～50 | 26～100 | |
| 25% hardness（N） | 20～500 | 100～300 | ||
| Growth (%) | 80～300 | 150～500 | ||
| Tensile strength (KPa) | 50～200 | 50～300 | ||
| Cracking strength（N/cm2） | 3～12 | 7～17 | ||
| Compression residual strain（％） | 2～10 | 3～7 | ||
| Cyclic compression residual strain（％） | 1～6 | 3～7 | ||
| Hysteresis loss（％） | 25～40 | 35～50 | ||
| Thermal conductivity（Kcal/mh℃） | Circa 0.030 (lighter density is better) | Circa 0.030 (lighter density is better) | ||
| Electrical resistance（Ω/cm） | 1012～14 | 1012～14 | ||
| Durability | heat-resisting property（℃） | highest | Circa 90℃ | Circa 100℃ |
| regular | Circa 70℃ | Circa 70～80℃ | ||
| Water and moisture resistance | Great stability and resistance to deterioration. | Tends to deteriorate particularly quickly at high temperatures and humidity, and in alkaline and acidic conditions. | ||
| Oil resistance | Swelling and reduced strength. | Less swelling and less strength loss. | ||
| Recovery occurs when oils are removed | ||||
| Weather resistance | Good for indoor use, but gradually deteriorates outdoors. | Slightly better than ether-based | ||
| Soundproofing | Good | Good | ||
| Thermoformability | Good | Good. Generally superior to ether-based systems. |
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| Flame laminability (thermal bonding) | Material for frame lamination is good | Good | ||
| Cell | Uniformity | Normally | Good. Generally better than ether-based systems. |
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| Size | Generally, it is difficult to vary the size of the cell. | Various cell sizes are easy to create. | ||
| Colourability (when foaming) | Easy | Easy. Vivid colours. | ||
| Punchability | Good | In some cases, the edges stick together when punching. | ||
| Products with improved punching properties are good. | ||||
| Abrasion resistance | Good | Good. Generally superior to ether-based systems. |
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| Examples of compatible applications | Cushioning, clothing, packaging and sound-absorbing materials | Cleaner materials, speaker edge materials, sound absorbers, thermal insulation and other industrial materials. | ||