04/01/2011

www.gupta-verlag.de/polyurethanes

Simrit develops PU materials to meet sealing challenges

For customers currently using the Disogrin 9250 material, the NOK U641 urethane is an alternative solution that is hydrolysis/glycol resistant and increases the long term operating temperature of the system to 110 °C with standard and biodegradable hydraulic oils. It can be run in the same tooling as Disogrin 9250 and has been a proven solution for more than a half decade. For those looking to significantly increase the life target of a system, substituting a NOK A505 NBR rod seal (with proper back-up) and a U641 buffer can double the life of this system.NOK UH05 urethane is a hydrolysis/glycol resistant solution for 120 °C systems with standard and biodegradable hydraulic oils. In particular, NOK UH05 (40 - 120 °C temperature range) seals have been successful in hydraulic cylinders exposed to harsh conditions.According to Simrit, it is rare for a material to not only have this high of a temperature range in the industry (allowing for use in a Columbian coal mine), but also one of the lowest temperature capabilities (allowing for use in Antarctic applications). Traditionally, a manufacturer would require two different sealing packages for each application. Using a NOK UH05 (buffer) in combination with NOK G928 HNBR rod seal (with proper back-up) can double the life of a system at 120 °C, while providing exceptional low temperature capabilities, says the company.Simrit is part of the Freudenberg and NOK Group Companies, which have total annual sales of more than USD 7 billion.

www.gupta-verlag.de/polyurethanes