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Abrasion: the surface loss of material due to frictional forces


Blister: a raised spot in the surface, or a separation between layers, usually forming void or air- filled space in the profile


Cell: a single small cavity surrounded partially of completely by walls


Cellular Rubber: rubber products containing many cells or small hollow receptacles dispersed throughout the mass


Closed Cell: a cell totally enclosed by its walls and hence not interconnecting with other cells


Compression Deflection: PSI to compress lab slab a specified percentage of overall height, normally 25%


Compression Set: the amount by which a rubber specimen fails to return to its original shape after release of compressive load


Crazing: A surface effect on rubber articles characterized by many minute cracks


Cross Section: A seal as viewed if cut at right angles to the molding line, showing internal structure


Durometer: (a) an instrument for measuring the hardness of a rubber; measures the resistance of permanent indentation into the surface of the rubber; (b) numerical scale of rubber hardness


Memory: the tendency of a material to return to original shape after deformation


Ozone Cracking: the surface cracks, checks or crazing caused by exposure to an atmosphere containing ozone


Rebound: a measure of the resilience, usually as a percentage of vertical return of a body, which has fallen and bounced


Skin: a relatively dense layer at the surface of a cellular material


Substrate: a material upon the surface of which an adhesive is applied for any purpose such as bonding or coating


Weathering: the surface deterioration of a rubber during outdoor exposure

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P.O. Box 2919

South Bend, IN 46680-2919






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