Superior dimensional accuracy and precision

Compression molding

A UI craftsman carefully trims excess silicone from metal plates.

Compression molding generally involves a material, such as urethane, silicone or rubber, that’s added to an open mold. The mold is closed and placed under great heat and pressure. The pressures on the top plate force the casting material to fill all mold areas and dispel air. Heat and pressure are held until the material is cured.

Compression molding is ideal for applications where durometer is low and tolerances tight – and where the cost of injection molding is an issue. With over 20 years experience, we have the expertise to create fairly intricate parts using compression molding.

Achieve shapes not obtainable with open urethane casting

We pride ourselves on offering a wide variety of processes – compression molding is one possible way to solve your application challenge.

If you have a tough challenge that’s left you scratching your head, call us. We’ve probably already solved it – and if not, we’ll figure it out.

The benefits of compression molding include:

Product uniformity

Compression molding allows for part geometry and configurations not achieved by other casting methods.

Dimensional stability

Compression molding is ideal for applications with tight tolerances and low durometer.

Cost-effective process

With compression molding, secondary operations, such as grinding or finishing, are often not needed.

Material choice

Urethane Innovators is adept at compression molding a wide range of urethanes, rubbers, and silicones.

In the following images, you can see how we’ve used compression molding to bond silicone to metal plates supplied by the customer. These plates, used in the manufacturing process, allow the customer to seal food into plastic “fun pack” meals found in the grocery store.

Silicone is specifically used for this application due to its ability to withstand the high temperatures of the customer’s manufacturing process. Urethanes are used when higher abrasion resistance, impact resistance or a wider variety of hardness is required.


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