Tuffclad Moly Bearing material
'Cobas bearing material'
cobas bearing material is a special material compounded from an advanced engineering thermoplastic with a combination of properties specially formulated for low friction, long life bearing applications. It combines a load bearing capacity greater than that of white metal with self lubricating properties better than those of nylon, while giving up to 10 times longer service than phosphor bronze. Developed and proven in many industrial applications over three decades,
cobas bearing material has become the preferred material
when high loads must be carried with small clearances, under dirty and unlubricated conditions. It is also most effective in moist, immersed and corrosive applications. This is because cobas bearing material has high dimensional stability and does not swell in water, in contrast to nylon 6 and 66 which absorbs up to 9% water by weight with consequent expansion and softening. Not only do cobas bearing material bushes generally last much longer, but the life of the mating pins and shafts is often greatly extended.
cobas bearing material, is a high performance replacement for traditional materials in anti friction and wear applications the initial cost is moderate. It is readily available in a wide range
of sizes, and is easily machined to fine tolerances into finished parts on standard metal working equipment.
a special service for the production of custom components is available.
The main advantages which combine to make an outstanding bearing material are: High load bearing strength and has a very low creep rates under design loadings of 30MPa and has a much higher load capacity than nylon, being unaffected by water absorption.Dimensional stability The thermal expansion is only 2,5 times that of bronze, while nylon and HDPE are 5 to 10 times greater respectively. does not swell when exposed to water or humid conditions, while nylon can expand by up to 3% linearly when immersed.
therefore requires only slightly more clearance than the corresponding metal parts and no allowance needs
to be made for moisture changes. Low friction shows outstanding dynamic frictional properties, with friction
losses of about half those of bronze or nylon. This allows for higher combinations of loads and speeds.The greasing of bushes on assembly further decreases friction, allowing higher speeds to be used and generally improving performance.
Water is also an excellent lubricant for bushes, making the material highly suitable for immersed conditions.
cobas bearing material HILUBE offers even further reduced friction (down by 50%), making it an ideal material for unlubricated applications.