Sponge rubber materials
Expanded rubber is the technically correct term for closed cell sponge rubber. The cells are like individual balloons, holding gas and not allowing moisture to pass through as long as the cell wall has not burst. The raw compound is mixed on the same type of equipment used to mix solid rubber compounds but with a chemical blowing agent added.
Sponge rubber is effective for providing resistance to gasoline, sunlight, ozone and oxidation and has superb air tight and water tight properties. This versatile rubber is the world’s first ever synthetic oil resistant elastomer. Sponge rubber sheet is commonly used in marine and automotive environments, as well as construction and electronics industries, for weather strips, glazing seals and closure seals as well as being ussed for shock and noise absorbers and deadening. Its properties also make it suitable for requirements including thermal insulation on items such as garage door seals.
Sponge rubber has good resistance to oils, whereas resistance to petrol and other hydrocarbons is more moderate. Depending on the grade of material, sponge rubber can withstand temperatures of as low as -40˚C and as high as 110˚C.
Characteristics of Sponge Rubber Sheet:
- Closed cell structure making it impermeable to air and water and therefore an ideal material for sealing against air and/or water
- Outstanding aging properties and will not go brittle over time
- Very durable and relatively cheap
- Flexible material
- Good UV, ozone, sunlight and oxidation resilience.
- Flame retardant
- Good resistance to oil and many petroleum derivatives and chemicals
- Has a good working temperature range
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