Seal manufacturer C. Otto Gehrckens has unveiled a new product range for the premium segment, the COG VarioPur series.
Constructed from three ‘high-performance’ materials based on thermoplastic polyurethanes, the VarioPur series has abrasion and extrusion resistance at least five times higher than traditional material NBR, according to COG, and a Shore A value of 90.
“Furthermore, the three TPU materials impress with excellent gas tightness and a high level of tolerance to a wide range of gases – from oxygen and nitrogen to all of the synthetic hydrocarbons. They exhibit no brittleness as a result of exposure to ozone or oxygen. The product's profile is rounded off by low swelling in mineral oil, hydraulic media and lubricating greases, generally good chemical resistance, and superb dynamic behaviour (blow-by behaviour).”, COG says.
The VarioPur 195 boasts low temperature flexibility down to -50 °C. Meanwhile, the VarioPur 395 has good stability in aqueous media, including oil-water emulsions (HFA), water-oil emulsions (HFB) and aqueous polyglycol solutions (HFC). It also displays competitive levels of resistance to other critical media, including biologically degradable oils (HEES and HETG), inflammable liquids, triglycerides and synthetic esters of hydraulic oils or water-free media.
The COG VarioPUR TPUs are used in applications in mobile and industrial hydraulics, gas processing technology and gas spring technology, pneumatics, valve technology, the chemical industry and foodstuffs/pharmaceutical processing technologies. They are available to order immediately, according to the manufacturer.