Freudenberg Sealing Technologies: PU material for hydraulic seals
According to Freudenberg Sealing Technologies, the environmental demands placed on the hydraulic systems in large, heavy equipment can be extreme. Pressure, abrasive fluids, extreme temperatures and dirt can all impact the reliability and performance of the seals used to protect their mechanics. Fortunately for manufacturers producing construction, agricultural and mining machinery – among other, heavy-duty industrial applications – Freudenberg Sealing Technologies’ proprietary 94 AU30000 polyurethane provides an optimal solution – a fact that sealing distributors confirm through increasing sales of this material, said the company.
The success distributors have witnessed with the seals is attributed to several key benefits. Sealing solutions made from the AU30000 material are not only resistant to water and synthetic hydraulic fluids but can handle major temperature and pressure fluctuations better than any other existing polyurethane on the market, said the company. They also offer very high extrusion resistance, allowing them to last longer under more challenging applications than other solutions on the market, said Freudenberg.
Distributors operating within the Sealing Solutions Group – a group of five companies spread across seven locations in Canada that serves as one of the largest distributors of hydraulic seals, pneumatic seals, shaft seals, self-lubricating bearings and other related components – offer a variety of AU30000 components to their customers and have reported a pattern of consistent performance and increased interest.
“The AU30000 material really outclasses others in terms of friction and pressure resistance and overall mechanical properties,” said Robert Weber, a technical director for Sealing Solutions Group. “And with our machining capabilities, we can create custom parts that our customers require using AU30000 billet supply, resulting in specialised seals and components that feature all the benefits of the material. It’s a standout product that really gives us a competitive edge.”
According to Freudenberg, AU 30000 performance benefits are numerous: Seals and other components made from this bright blue polyurethane are said to have benchmark capabilities in areas like compression set, tear strength, hydrolysis and extrusion resistance. They can be used to seal systems operating in very hot and cold environments ranging from –40 °F (–40 °C) to 248 °F (120 °C). They are resistant to mineral oils, biodegradable hydraulic fluids and water. They also offer a substantially longer service life, saving customers downtime and maintenance costs, especially in fluid-based applications where hot water and steam are present, said the company. In addition to overall performance, seals made from AU 30000 can also reduce the number of needed parts in certain applications, resulting in easier installation and less downtime.
“Any time you can reduce a two-piece configuration to a one-piece without losing any performance, it’s obviously a benefit,” said Weber. “One example is that when using a rod seal made from AU 30000, you no longer need an anti-extrusion ring with it due to its excellent performance under pressure.”