Polyurethane Molding/

Urethane Bumpers

Urethane bumpers are protective parts that function to absorb shock or to impede contact. Since they are formed from urethane, which is elastomer containing urethane carbamate links, this type of bumper has many advantages over conventional elastomers and plastic materials. Some examples of these benefits include high abrasion and impact resistance nose abatement properties, high load bearing capacities and a broad hardness range.

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Gallagher Corporation
Gurnee, IL
800-373-8793
Since they opened their doors in 1965, Gallagher Corporation has been a multifaceted engineering, molding and machining operation. They are able to help customers improve their products durability. To gain increase wear life, better cut or tear resistance, more impact resistance or superior fatigue life, use Gallagher molded components, such as urethane bumpers.
 
American Urethane, Inc.
Odenton, MD
800-394-7883
For urethane bumpers and other parts, be sure to contact American Urethane. They provide customers with superior service and quality products. The materials used by this company are finding new applications in many industries because the parts provide longer service life compared to plastics and rubber, as well as lower noise abatement compared to metals.
 
Unicast Inc.
Easton, PA
800-275-0818
Unicast Inc. has been a family owned and operated company since 1984. This full service shop and plant is able to create the product you need, such as urethane bumpers. They offer products for a wide range of industries including corrugated, envelope, military, mining, newspaper, packaging, recreational products, textile and more. Call today to request a quote.
 
FallLine Corporation
Reno, NV
800-325-5463
Since FallLine began in 1981, they have been providing specialized products, including urethane bumpers, to numerous industries for retail and industrial applications. By employing a team of dedicated, experienced chemists, engineers and sales personnel, they are able to assist all customers in the development of their project from inception to completion.
 
Weaver Industries, Inc.
Denver, PA
717-336-7507
For over 55 years, this family owned and operated business has been known for its reputation for integrity and quality. They owe this to the way base their company off family values and passing those values to customers through their people and pride in our work. For all products, including urethane bumpers, turn to Weaver Industries for quality you can trust.
 
Western Roller Corporation
Bend, OR
800-541-2317
At Western Roller Corporation, they have the knowledge and experience to help you match the right product to your application. With solutions to your specific needs, they offer custom items to make sure every requirement can be met. For urethane bumpers and all other products, be sure to contact Western Roller today so they can locate the perfect solution for you.
 
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Urethane Bumpers

Hard urethanes (90A-95A) are best-suited for bumpers as they work best in impact applications. There are two main types of urethanes used to mold bumpers: ester-based urethanes and ether-based urethanes. Ester-based urethanes are characteristically softer, while ether-based urethanes are harder and have a tender, but brittle feel to them. In addition, ester urethanes offer excellent compression recovery, while ether urethanes have better UV resistance. Urethane bumpers are most often utilized in the automotive industry, but are also used in industries such as: electronics and appliance, for non-skid applications; industrial manufacturing, to guard, stop and align both machinery and work pieces; construction, for cabinet doors and additional building fixtures; and commercial, for products such as cutting boards and picture frames.

As a thermosetting elastomer, urethane is cured through heat and once it is cured, there is no way to alter the shape, unlike thermosoftening plastics that can be re-heated and re-shaped. In order to shape urethane, there are several different processes that could be used; however, molding is generally the process most often used. In order to begin the molding process, a mold must first be made in the desired shape. To create the mold, a master mold must be created through coating the pattern in a silicone-based liquid rubber. Once the liquid-coating hardens, the pattern is removed and a void, or empty cavity, is left behind that can be used to shape urethane into the bumper pattern. The most common molding process used to form urethane bumpers is reaction injection molding (RIM). To begin this process, urethane is mixed with a polyisocyanate component and then injected using a low-pressure pneumatic gun into fill holes that were drilled into the mold. Next, the mold is placed into a pressurized pot that serves to compress air bubbles that may have developed and become trapped during the injection process. Finally, after a certain amount of time has passed to allow for curing, the mold is removed from the pot and opened so that the newly formed urethane bumper can be removed.