To begin the process of gaining UL Recognition for a custom compound, please contact an RTP Company sales representative for your area. The Find Your Representative section of this web site can assist you in locating an RTP Company sales engineer or business manager.
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)
Heat deflection temperature
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
Failure times determined
Data analyzed by UL
Relative thermal index assigned (also referred to as Continuous Use Temperature)