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Obtaining Material Recognition

  1. Communication between RTP Company and customer
    • Determine flammability requirements for the application.
    • Determine other UL requirements for the application, (See #3 below).
    • Ensure chosen material is appropriate for the application.
  2. Samples are prepared by RTP Company and submitted to UL
  3. Samples tested
    • Samples are tested by UL per UL94
      • Flammability (5VA, 5VB, V-0, V-1, V-2, HB)
    • Samples are tested by UL per UL746A (a required by customer's application)
      • D-495 (ASTM D-495 arc resistance)
      • CTI (comparative tracking index)
      • HAI (high amp arc ignition)
      • HVTR (high voltage arc tracking rate)
      • HWI (hot wire ignition)
      • HVAR (high voltage arc resistance to ignition)
      • Volume resistivity
      • Dielectric strength
      • Impact strength
      • Tensile strength
      • Flexural strength
      • Heat deflection temperature
      • Dimensional stability
      • Composition analysis
        • Infrared spectroscopy (IR)
        • Thermogravimetric analysis (TGA)
        • Differential scanning calorimetry (DSC)
    • Sample are tested by RTP Company per UL746B (as required by customer's application)
      • Samples are heat aged at temperatures determined by the type of material being tested
      • Samples are pulled at periodic intervals specified by UL
      • Samples are tested for the following properties
        • Dielectric strength
        • Impact strength
        • Tensile strength
        • Flammability
      • Failure times determined
      • Data analyzed by UL
      • Relative thermal index assigned (also referred to as Continuous Use Temperature)
  4. Material is Recognized
    • Included in "Recognized Component Directory."
    • Yellow Card issued.
    • Follow-up procedure established.