Las Vegas, Nevada -- Simrit's new NOK U641 and NOK UH05 urethane seal materials have been developed specifically to meet the sealing challenges of today's cylinder makers, and the company claims they are proven to help engineers extend seal life in numerous applications.
When used properly, these materials provide 8000 to more than 10 000 hours of running time in the field without failure, the company said.
"Industry challenges, such as temperature, hydrolysis resistance and bio-friendly fluid compatibility, will consistently drive the need for more robust sealing solutions," said Joel Johnson, vice president of technology, Simrit, in a 24 March company release.
"As a materials and sealing innovator, Simrit anticipated these upcoming changes and developed next-generation materials for issues that our customers are now encountering. This forward-thinking allows us to serve our customers' current problems with established and proven solutions," Johnson added.
For customers currently using Disogrin 9250, NOK U641 urethane is an alternative 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 increase the life target of a system significantly, substituting a NOK A505 NBR (ntirile rubber) rod seal (with proper back-up) and a U641 buffer can double the life of this system, the company said.
NOK UH05 urethane is a hydrolysis/glycol resistant solution for 120°C systems with standard and biodegradable hydraulic oils. In particular, seals made of NOK UH05 (40°C to 120°C temperature range) have been successful in hydraulic cylinders exposed to extremely harsh conditions.
Simrit notes that it is rare for a material to have both this high of a temperature range in the industry (allowing for use in a Columbian coal mine), and also one of the lowest temperature capabilities (allowing for use in Antarctic applications).
Traditionally, a seal maker would require two different packages for each application, but Simrit says that, 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."
Simrit is part of the Freudenberg and NOK Group companies, which have total annual sales of more than $7000 million.