Thanks to their high elasticity and their very good resistance to wear and abrasion, elastomers made of rubber are generally superbly suited to seals. But they also have disadvantages: Due to their limited Shore hardness (a maximum of 90 SH A), they are not suited to applications at all levels of pressure. Dynamic applications are only achievable with the use of lubricants. Freudenberg Sealing Technologies polyurethane materials offer an alternative in cases where rubber elastomers cannot be used or where highly specialized elastomers are out of the question for cost-related reasons.
History
Dr. Otto Bayer" width="200" height="227"> Dr. Otto Bayer
In 1937, a research group at I.G. Farben led by Dr. Otto Bayer (1902–1982) produced polyurethane (PU) synthetically for the first time, and the material made its triumphant march around the world. The industrial production of PU began in 1940. The first foam material based on PU was developed between 1952 and 1954. Many additional developments based on PU followed over the course of decades. As early as 1960, the production of PU foam material came to 45,000 tons. Global demand has greatly increased since then. At present, more than 12 million tons are processed annually. Today it is difficult to imagine our everyday lives without polyurethanes. They are actually one of the most multifaceted categories of plastic. We encounter them as soft polyester foams, as thermal insulating materials, in the soles of our shoes and in the steering wheels of our cars. Polyurethanes above all owe their wide distribution to two special attributes: They can be produced by mixing liquid feed materials. This can even be done in small processing operations. And since innumerable feed materials are available, it is possible to manufacture made-to-order materials in consistencies ranging from soft to hard or from foamed to compact, for a broad range of applications.
There’s a new generation of polyurethane on the market, courtesy of our friends at the German company Freudenberg Sealing Technologies.
It’s called 94 AU 30000 polyurethane, and it achieves much better results than other materials on the market due to its improved characteristics. It gives seals a high resistance to even hot water and lets them last longer than other seal solutions.
Among 94 AU 30000 polyurethane’s values to customers:
High extrusion stability allows operating pressures up to 50 MPa/7250 psi.
High tear resistance boosts operating life and resistance to wear.
Stability in temperatures from -31 degrees F to 250 degrees F/ -35 degrees C to 120 degrees C.
Outstanding with mineral and biodegradable hydraulic fluids.
If you’re interested in learning more about Freudenberg polyurethane materials, and about 94 AU 30000 polyurethane, download
