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Which Bearing Retainer Is Right For You?


PHENOLIC - EuroBearings 

Phenolic Laminates for dental bearing applications are made by applying heat and pressure to convolute wound layers of linen cloth impregnated with synthetic thermosetting resins. When heat and pressure are applied to the layers, a chemical reaction (polymerization) transforms the separate layers into a single laminated material with a "e;set"e; shape that cannot be softened again. The new "e;L"e; and "e;LE"e; phenolics are used for retainer cages in high-humidity environments such as those found in steam autoclaves. Thephenolic retainer is submerged in a warm bath of synthetic ester and PAO lubricants.  After several hours the retainers are drained and dried.  During high speed operation, heat build up causes the lubricant to move from a solid to a liquid state. This keeps the rolling elements lubricated in environments where lubricant is scarce.  This type of retainer is used widely in Europe and referred to most commonly as "e;EuroBearings"e;. Their ability to retain and "e;wick up"e; lubricant  makes them especially desirable. Color varies from light brown to brown

POLYIMIDES
 
Polyimide, also known as PI, has been mass-produced since 1955. It is a general class of thermoplastic or thermoset polycondensate. It is an especially hard plastic with high
impact and dielectric strength, high heat resistance (260°C continuous, up to 480°C intermittent), and a low coefficient of thermal expansion. Ease of machining and low cost of production make this type of retainer an excellent choice for disposable handpieces. Most commonly found and produced in Asia . Colors available are clear, yellow translucent, brown and gold.

TORLON®

BEARING GRADE
Torlon® 4301 (Bearing Grade) PAI is primarily used for wear and friction parts. It offers a very low expansion rate, low coefficient of friction and exhibits little or no slip-stick in use. Torlon® 4301's flexural modulus of 1,000,000 psi is higher than most other advanced engineering plastics. This grade excels in severe service wear applications such as non-lubricated bearings and in high temprature environments.  DentalPartsHaus uses only machined Torlon® from rod stock and not a moulded form which suffers from weakness in thin sections and is prone to stress fractures. Torlon® is most commonly found in North America.

 

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