Recorded March 5th, 2014
Presented by UL
UL Safety Standard 746B has historically been used to evaluate heat resistance of plastics at elevated temperatures. This standard is a trusted source for establishing high-temperature ratings for plastics. And because an evaluation can take months to determine a rating, choosing a plastic already rated for high temperatures can make a significant positive impact on product development timelines.
But what happens when a known formulation is changed to adjust to supplier conditions or any other design specific reason, and a long-term thermal aging test is considered necessary to validate the already established rating? This can be an unexpected surprise in the development cycle of the molded plastic part. A better understanding of the compound’s chemistry and its effect on heat resistance, a review of short-term analytical test results, and a validation of high temperature performance at specific times can help in designing faster alternate test methods to validate the performance of a modified compound formulation with an already established high-temperature rating.
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