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-therm 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

References

  1. ↑ "Plastics Testing". UL Industries.
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