To meet market expectations, we have supplemented our assortment with products that, along with Viton®/FPM/FKM gaskets, will allow for comprehensive support of the most demanding investments. In our offer, you will find gaskets from many available materials, for a wide spectrum of consumers:
Below, you will find a brief characterization of the most popular materials used for production of technical gaskets:
EPDM (ethylene propylene diene monomer rubber)
EPDM rubber is a copolymer of ethylene, propylene and a small amount of diene. Products made from EPDM mix have high chemical resistance, and with the right stabilization, good resistance against atmospheric factors and ozone. They can be used as electrical insulators. Vulcanizates based on EPDM rubber have good properties against the action of high temperatures up to +130°C and elasticity at low temperatures, as low as -40°C.
NBR (acrylonitrile butadiene rubber)
Acrylonitrile butadiene rubber (NBR) is a product of free-radical copolymerization of butadiene with acrylonitrile (18-40%) in an aqueous emulsion. It is commonly referred to as “oil-resistant rubber”. Its vulcanizates are more resistant to the action of gasolines and oils the more acrylonitrile they contain. Gaskets based on NBR have high elasticity, ultimate tensile strength and low deformation under persistent compression. Their standard temperature resistance ranges from: -30°C to +100°C. Special varieties achieve resistances from -55°C to 130°C.
SBR (butadiene-styrene rubber)
Butadiene-styrene rubber (SBR) is a copolymer of butadiene and styrene. Vulcanizates from this rubber have similar elastic properties to natural rubber (NR). However they exhibit increased resistance to the action of atmospheric factors, including ozone, water and high temperature.
SBR vulcanized products are resistant to the action of many non-polar solvents and diluted acids and bases. In motor fuels, oils and fats, they undergo relatively large swelling. In comparison to natural rubber, this swelling is slightly smaller. SBR-based vulcanizates are resistant to alcohols, weak acids and non-organic bases. Butadiene-styrene rubber exhibits average resistance to the action of ozone and atmospheric factors. It ages relatively quickly under the influence of sunlight. SBR is not resistant to the action of mineral lubricants and oils as well as gasoline and hydrocarbons.
The standard temperature resistance ranges from -20°C to +70°C.
Silicone/VMQ (silicone rubber)
Silicone rubber (VMQ) is fabricated through polymerization of chlorosilanes, e.g. methylchlorosilanes. Its molecules consist of a non-organic main chain of Si-O structure with organic side chains. The variety of silicone rubber most commonly encountered in the technical gaskets industry is a system where additional vinyl groups are added to the molecule – this configuration’s acronym is VMQ. Vinyl substituents improve the level of cross-linking and behavior under the action of deforming pressure, as well as tear strength. In general, silicone rubber vulcanizates are distinguished by high resistance to temperature, to the action of oxygen, ozone and UV radiation, as well as by satisfactory insulating properties. With respect to other elastomers, at room temperature, they are characterized by greater vapor permeability and are non-flammable. Silicone gaskets are not recommended for dynamic work, as they exhibit low ultimate tensile and tear strength as well as low resistance to abrasion.
The standard temperature resistance ranges from: -30°C to +200°C, with special modifications up to +230°C.
Teflon/PTFE is a plastic produced by the free-radical reaction of tetrafluoroethylene polymerization in the presence of peroxidic initiators. This material is distinguished by high resistance to the action of most chemical compounds and solvents. It is also characterized by excellent electrical insulation, regardless of ambient temperature and moisture. Among polymers, PTFE has very good resistance to aging, UV radiation and atmospheric factors, including ozone.
Teflon can be modified. To improve its mechanical properties, PTFE can be strengthened with additives such as glass or carbon fiber, graphite or bronze.
Depending on the degree of modification, Teflon can be applied within a very wide range of temperatures (from -200°C to +260°C).
Very low friction coefficient.
No possibility of gluing.
You will find more information about the resistance of individual materials in the table of resistances, which can be downloaded here.