Cellular rubber
Cellular rubber (also cellular rubber ) is a closed-cell, foam-shaped elastomer , which is used, among other things, for sealing, soft storage, insulating, isolating, decapping and sound deadening. With regard to its pore structure, it differs from the other types of pore rubber , the foam rubber with largely closed pores and the open-pore sponge rubber .
Properties and areas of application
Cellular rubber is a closed-cell or closed-cell elastomer which is produced or foamed in block form (e.g. 2000 × 1000 × 50 mm) and can then be further processed. The cells of this foam are not connected to each other, so the material is watertight and airtight. Cellular rubber does not absorb moisture even without further treatment such as coating or the like. A typical aging consequence in cellular rubber is material shrinkage. This is a product of the product and is unavoidable, but different degrees depending on the type of cellular rubber.
Cellular rubber is produced and delivered in exceptional cases from a thickness of 0.8 mm, but generally from 2.0 mm in the form of sheets, as sheet goods, customer-specific cuts, strips or punched parts. In practice, cellular rubber is often provided with a self-adhesive layer on one side. The adhesive coating serves as an assembly aid. Cellular rubber is mostly used as sealing material, insulation, spacers, vibration protection or as a craft material.
The elastomers provide the basic structure for the rubber compounds , the final properties of the product are determined by other additives such as fillers, plasticizers , anti-aging agents, crosslinking chemicals and others.
There are four main groups of cellular rubber mixtures or elastomers:
- Natural rubber (abbreviation NR) is suitable for normal technical purposes without particularly high requirements in terms of temperature, aging , resistance, etc. Natural rubber has an average density of approx. 130–160 kg / m³
- EPDM (outdated also called APTK) is for outdoor purposes and is therefore very resistant to aging, ozone, light, weather, temperature, etc. The EPDM quality also has good light crack resistance. The gross densities are approx. 145 kg / m³
- Chloroprene rubber (abbreviation CR) isgoodfor high requirements in terms of temperature, flammability, resistance to oil, acids, alkalis and grease, as well as weathering, aging and ozone . The gross density is on average approx. 160–170 kg / m³
- Nitrile rubber (abbreviation NBR) is an oil-resistant and partially petrol-resistant, also very good weather- and ozone-resistant, but flammable quality. The gross density is approx. 160–200 kg / m³
Individual evidence
- ↑ Entry on pore rubber. In: Römpp Online . Georg Thieme Verlag, accessed on January 7, 2016.