Jini Polymech Engineering :> Mfgs. of Polyurethane Elastomers & Integral Skinned Foam Products

Polyurethane Elastomers
Advantages of Polyurethane
Polyurethane Pads/Mats: Polyurethane pads and mats are used mainly where there is stripping, forming, embossing applications it also helps in making utensils, in this material thinning is less comparatively to conventional forming. Following are the applications where polyurethane rods,sheets,bushes used
	Strippers bushes for moulds and dies Metal forming dies (as cast) Shock absorbers Scraper blades Abrasion resistant linings Piercing Embossing Bulging Drawing
Polyurethane Bushes and Springs: Polyurethane is new wonder material, which has superior properties, and plays a vital role in today’s industrial scenario, which combines strength of plastic and elastic of rubber..Wire springs have tendency to break under high pressure and permanent set in short time .P.U can sustain very high loads and higher hardness than rubber. Unlike rubber it does not take part in weathering or chemical actions under normal condition.	Technical Info of Springs/Bushes
They are internationally famous for for their abrasion resistance, high resilience, and excellent resistance to oil and grease.Because of these exceptional properties P.U bushes are being increasingly used in sheet metal dies, where steel springs is known to break under high pressure and set in short time while conventional rubber bushes can not sustain high loads quickly in oil.Life expectancy of polyurethane is very high polyurethane springs and pads are ideally suited for presstools, jigs, fixtures, conveyors, machine tools etc.where the action of stripping, forming, dampening, cushioning, resting and rolling are involved ,for optimum results and longer life selection of appropriate grades and sizes as per application is important
Polyurethane Hammers: Polyurethane hammer has prolific advantages then the conventional rubber,nylon hammer The head is desigened for greater impact without rebounce It is superior single piece structure steel fully covered by polyurethane, It is scratch proof ,dent free working protects workpieces Sparks dont arise due to polyurethane coating Longer life span and hence cost effective. Applications: Die and Mould making Automobile Industry Electronic Industry Aircraft Industry Various assembly lines ,bearing fitting,garages,etc.
Advantages of Polyurethane Elastomers
Abrasion Resistant Parts made of polyurethane will often outwear other materials such as rubber,plastics, metals by a margin of 5 to 50/one when severe abrasion is a factor. It has been proven to be vastly superior to rubber plastics and metal in many applications. Oil and Solvent Resistant Polyurethane has excellent resistance to oils, solvents, fats, greases and gasoline. Load Bearing Capacity Polyurethane has a higher load-bearing capacity than any conventional rubber. Because of this characteristic, it is an ideal material for load wheels, heavy duty couplings, metal-forming pads, shock pads, expansion joints and machine mounts. Tear resistant Tear-strength ranges between 500-100 Ibs./linear inch, which is far superior to rubbers. As a result,Polyurethane is often used as drive belts, diaphragms, roll covers, cutting pads, gaskets and chute liners. Weather resistant Polyurethane has outstanding resistance to oxygen, ozone, sunlight and general weather conditions. Impact Resistant Plastic materials tend to become brittle as they become harder polyurethane retain their elasticity. They resist breakage even in the hardest formulations. This toughness makes polyurethane ideal for parts subject to high impact or repeated pounding. Excellent noise abatement properties The hard polyurethane grade are now being used as gears in products where engineers desire sound reduction. The soft polyurethane are used to replace rubbers for improved sound/vibration dampening. Elasticity Under repeated flexing, polyurethane resist cracking as well as most other elastomers. However, since cracking in any elastomer can be reduced by making the part thinner, polyurethane offer an important advantage: they can be used in very thin sections because of their inherent strength and toughness. Resilience Unlike rubbers, polyurethane don't have to be made soft to make them resilient. In fact, polyurethane can be as resilient as much softer materials. For shock absorbing applications, polyurethane can be formulated with rebound values as low as 10% to 25%. For quicker recovery, or where high-frequency vibrations are a factor, rebound values of up to 40% to 70% can be formulated. Flex-Life Most formulations offer extremely high flex-life and can be expected to outlast other elastomer materials where this feature is an important requirement. Dust boots, bellows, diaphragms, belts, couplings and similar products are made from polyurethane for this reason. Electrical Properties Polyurethane has excellent electrical insulating properties and is used successfully in many moulded wire and cable hardness assemblies. Polyurethane...bondable to nearly anything! During the molding process or after processing, polyurethane can be bonded to a wide range of materials. Bond strengths on metal, wood, and plastic substrates are often stronger than the Polyurethane itself, and are usually several times stronger than a similar rubber-to-substrate bond. Heat and cold resistant Continuous use above 225°F is not recommended nor is Polyurethane recommended in hot water over 175°F. At low temperatures, polyurethane will remain flexible down to -90°F. A gradual stiffening will occur at 0°F, but will not become pronounced until much lower temperatures are obtained. Polyurethane is fully machinable Operations like Turning, Facing, Drilling, Grinding can be successfully carried with less heat generation and power .
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