Busak+Shamban announces development of a new range of proprietary Fluorocarbon elastomers (FKM) based materials for aerospace sealing.
Known as Turel® LTFE, the material will genuinely provide certainty of sealing at temperatures as low as -40°C.
The launch of Turel® LTFE materials extends the company's range of FKM materials (offering outstanding heat and fluid resistance) to the increasing number of applications requiring these seals, but with a flexibility in a cryogenic environment. Two Turel® LTFE grades meet these requirements and are available at 75 and 90 IRHD hardnesses, both offering exceptional characteristics to meet demanding aerospace sealing requirements, including:
Resistance to Low Temperatures
An area in which the new materials show their obvious advantage. Laboratory testing has shown that, whichever standard test method is used, Turel® LTFE materials are 10°C better than the next best low temperature FKM material and at least 20°C better than "standard" FKM material.
Stress and Strain Properties in Tension
Tests show that the stress and strain properties of the new materials are similar to those of other FKM materials. This includes elongation at break, an indication that seal assembly will not be problematic.
Resistance to Heat
Tests at +200°C show Turel® LTFE materials offer slightly improved resistance to property changes than other Busak+Shamban FKM’s, though all are excellent.
Resistance to Fluids
Immersion tests indicate that the new materials are resistant to a wider spectrum of aircraft fluids than other materials. This includes an acceptable resistance to Skydrol 500B.
Resistance to Compression Set (ISO 815)
Due to the curing method required for Turel® LTFE, the materials exhibit slightly poorer resistance to compression set than other FKM’s. However, it still has excellent resistance to compression set at 200°C.
Extensive trials have demonstrated, with the appropriate choice of moulding conditions, manufacture of components under production conditions can be achieved. To date, various sizes of O-Rings and rectangular section rings have been successfully produced, tested and provided to the industry.