Abrasion resistance: The two types of abrasion are sliding and impingement. Sliding is the rubbing of 2 parallel surfaces against each other. Impingement is the force of a material hitting the surface of the urethane.
Compression Set: Compression set is measure by the percentage of deflection that does not return to its original shape. One method of testing is to compress the urethane for a given period of time. Another method is to deflect the urethane for a given number of cycles. The percentage of deflection is the change in the original height.
Durometer (Hardness): The hardness of the final product. A gauge used to measure hardness of urethane. Most common scales used for urethanes are Shore A and Shore D scale.
Modulus: Stiffness of a urethane as measured by the force required to stretch a strip of material a given length.
Open Cast: Gravity-filling a mold by pouring material into an open cavity tool or mold.
Pattern: The part or copy of the part used to make a tool from soft tooling.
Rebound: Measured by an impact resilience test. Rebound is the percentage of return a urethane has when dropped from a given height.
RIM: Reaction Injection Molding - filling a closed tool under low pressure.
Tear resistance: A measure of the resistance of elastomer to tear and gouging. Two types of tear tests are Split tear and Die C.
Tensile Strength: The force per unit of the original cross-sectional area, which is applied at the time of the rupture of a specimen.
Tooling: Custom-made pieces used to form the final product. Tooling can be made from a variety of materials. Tooling may also be known as a mold.
