Precision Urethane & Machine, Inc.

Flexible Solutions Through Polymeric Innovation

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Urethane Products can be found in almost every industry world wide. Global utilization of polyurethane products is possible due to polyurethanes mechanical properties and the means in which they can be manipulated thru the use of different curatives and additives. This creates a number of unique opportunities to address application specific problems while maintaining performance characteristics unequaled in any other material.

Molded Urethane Products span a very broad hardness range and impart a vast array of mechanical properties which make them well suited for many applications. Hardness is the primary unit of measure for polyurethane products and is measured on two separate scales. The Shore A scale is used for softer durometers and the Shore D scale for harder durometers (hardnesses). Examples of Cast Polyurethane Products rang from sponge like drain covers which are 20 Shore A, 90 Shore A Conveyors rollers to bowling balls which are 80 Shore D.

The Manufacturing Process:

Molded Urethane Products typically contain 2-4 components consisting of a resin base, 1-2 curatives, and a colorant such as a pigment or dye. Most manufacturers use meter-mix and dispense machines to mix the components into a homogenous liquid which can then be introduced into a heated mold to create the finished product. Typical methods used by Precision Urethane to mold Urethane Products include:

• Compression Molding:

  Liquid polyurethane is poured into an open mold and placed in a heated compression press and pressure is applied to extrude the material into all areas of the mold.

• Open Cast Molding:

  Liquid polyurethane is poured into an open mold which is placed in an oven or on a heated table.

• Spin Casting:

  Liquid polyurethane is poured into an open mold which is spinning. This process is designed to remove any air entrapped in the pouring process.

• Low Pressure Injection Molding:

  Liquid Polyurethane is injected into a closed mold which is fastened together with bleed gates designed to allow the air to bleed out of the mold in the injection process.

• Physical Properties of Cast Polyurethane Products:

  The performance criteria of polyurethane products is measured using data obtained from tests designed to isolate an individual characteristic of the finished material. These tests are typically run according to an established set of standards provided by an accredited organization such as the American Society for Testing and Materials (ASTM) who define the procedure in detail (www.astm.org). There are many different tests and procedures which can be performed on polyurethane materials. The primary function of these procedures is to establish a set of predictable performance properties which can be used to design a product which will meet a predetermined set of performance requirements. Precision Urethane has developed a significant base of polyurethane material data which we use to determine the correct material for application conditions.

  If you have questions or require additional information please call us. We will be happy to provide a flexible solution.

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