SUPER PRO POLYURETHANE BUSHINGS
SuperPro is a polyurethane elastomer based material and is a class of "Thermosetting" synthetic polymer that involves the reaction of various types of isocyanate resin with curing agents to give an extremely durable material with the best features of rubbber and plastic.
SuperPro polyurethane product range is fully backed by a professional research & evelopment program based on many years of hands on experience in the suspension industry.
The Polyurethane that is specifically blended for the SuperPro product has mechanical properties that make is extremely successful in its application. The properties of extreme resistance to abrasion, low compression set, high tear strenth and a resistance to oils and solvents make it ideal fo automotive applications. These properties lead to a resilient product that is highly versatile in its applications.
The double helix is used on the inside of the bushing. This design is primarily used on shackle bushings providing a region for grease to travel along. This allows the boundary layer of grease to form between the inside diameter of the bushing and the outside diameter of the tube. The double helix is extremely successful in greasable shackles as the grease can travel from the centre of the bushing, along the helix and out to the grease grooves in the head of the bushing.
When polyurethane is used to replace rubber in many suspension applications, it often has to accommodate large variances in tolerances.
Rubber is not a precision component and will compress or distort readily to allow fitment, which in turn creates binding of the bushings. This is one of the main reasons why SuperPro polyurethane is superior to rubber bushings, as they have a free pivoting point and not a torsion pivot like rubber. SuperPro had to develop a method of achieving the correct pre-loads while still accommodating a range of variances in sizes. Bullet grooves allow the bushings to flex and accept a much wider range of sizes while still maintaining free pivoting of the bushings.
The crush tubing is an integral component of the suspension bushing system and is necessary for free pivoting. The crush tubes are made to precision tolerances to ensure that the precise fits are maintained. All SuperPro tubes are made of STEEL & ZINC plated for corrosion protection and appearance. In some applications SuperPro incorporates end knurls and hardened tubes to provide positive location. As required SuperPro provides presion machined steel SHELLS to allow the installer to quickly and easily replace worn components.
This is used on inside diameters of bushings to enable unrestricted pivoting of the poloyurethane bushing around the crush tube. The knurling has two inherent design advantages. The knurling reduces the surface area of polyurethane in contact with the crush tube. This reduction in surface area results in less frictional forces being developed. The SuperPro knurl bore keeps the lubricating grease intact for the life of the bushing, and eliminates the necessity for periodic re-greasing.