New product range of high-performance TPU seals

The independent seal manufacturer C. Otto Gehrckens presents the new COG VarioPur seal range based on thermoplastic polyurethanes (TPU/AU).

Both the abrasion and the extrusion resistance are at least five times higher than those of the traditional material NBR, which has a Shore A value of 90.

Furthermore, the three TPU materials provide high gas tightness and a high level of tolerance to a wide range of gases from oxygen and nitrogen to all synthetic hydrocarbons.

The seals exhibit no brittleness as a result of exposure to ozone or oxygen and they feature low swelling in mineral oil, hydraulic media, and lubricating greases, generally good chemical resistance, and high dynamic behaviour (blow-by behaviour).

In addition to the high-performance universal TPU material, COG VarioPur 195, COG introduces two special TPU sealing materials.

As well as the complex properties of a high-performance TPU compound, COG VarioPur 295 additionally provides good low temperature flexibility right down to -50°C.

COG VarioPur 395 is hydrolysis resistant, which is a quality that simply does not exist in this form in other TPU materials.

The special TPU is highly stable in aqueous media, including oil-water emulsions (HFA), water-oil emulsions (HFB), and aqueous polyglycol solutions (HFC).

It also exhibits resistance to other critical media, including biologically degradable oils (HEES and HETG), hardly 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.