Relative temperature index

The Relative temperature index (RTI) is a characteristic parameter related to the thermal degradation of plastic materials.

The RTI is part of the thermal-aging program of the UL 746B standard from UL.[1]

During the process of the UL 746B program, the degradation of certain properties of the material like dielectric and mechanic strength, is investigated with regards to thermal-aging. The RTI is the temperature in degrees C, at which the properties have decreased to 50 percent of their initial value after a long-term exposure to this temperature.

Though the RTI is an index, it is given in Celsius units. The UL 746B standard distinguishes between three sub-categories of the RTI:

  • Electrical RTI which relates to electrical insulating performance.
  • Mechanical impact RTI which relates to mechanical performance with impact
  • Mechanical strength RTI which relates to mechanical performance without impact

Literature
  • UL 746B, 5. Ed.: Polymeric Materials – Long Term Property Evaluations
  • N. Navarro: Predicting Elevated Temperature Ratings of Polymeric Materials in C. White et al.: Service Life Prediction of Exterior Plastics, New York: Springer (2014), ISBN 9783319060330
  • Over Time and Under Heat, Polycarbonates Hold Up: Plastics Eng. 24 (2011), p.24
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References
  1. "Plastics Testing". UL Industries.
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