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Troubleshooting Guide – Linear Polyethylene Problem Possible Cause Suggested Remedy 1. Long-Term Part Part over-cured during molding • Decrease oven temperature or heating cycle. Failure Photodegradation of part caused by ultraviolet light from sun or internal lighting (fluorescent) • Use a UV stabilized resin in application. Stress-cracking due to multiaxial stresses in part; may have been accelerated by chemical environment and temperature. • Use a stress-crack resistant polyethylene grade. • Add suitable U.V. stabilizer and/or pigment. • A fine, well dispersed carbon black with UV stabilizer affords the best protection. • Do not store an environmental stress-crack solution in a container molded from a poor environmental stress-crack grade of polyethylene for a long period of time or at elevated temperatures. 7PDF Image | Troubleshooting your rotomolding operation
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