Material Geometry
Constant cross section profiles originate through forcing raw elastomer compounds through a hardened steel die under high pressure. These seal extrusions maintain uniform dimensions along their entire length during the continuous vulcanization cycle. The process relies upon precise control of feed rates and temperature gradients to avoid voids or surface blemishes.
Dimensional Tolerance
Thermal expansion during curing creates non-linear shrinkage which complicates final sizing for critical gaskets. Operators monitor the output diameter against a calibrated gauge to detect deviations from the design specification. Differences between the cold tooling shape and the finished rubber profile define the shrinkage factor for a given compound batch.
Mechanical Constraint
Compression set testing determines how well the final product retains its elastic memory under sustained load. Standard procedures require holding the part at a set deflection for a specific interval before measuring the residual height change. Deviations from the baseline indicate improper cross linking or insufficient cure time within the production line.
Field Performance
Environmental interaction at the interface causes gradual material degradation which alters the effective seal contact stress over time. Exposure to ozone and fluctuating temperatures accelerates permanent deformation within the polymer matrix. High quality parts exhibit predictable decay rates that allow engineers to establish reliable replacement schedules for industrial assemblies.
