Flames or glowing of the sample extinguish within 30 seconds after removal of the glow wire, and if the cotton or the paper underlay doesn't ignite or burn. Ensure chosen material is appropriate for the application. Yellow Card issued. Follow-up procedure established. The number of seconds that a material resists the formation of a surface conducting path when subjected to a continuous arc of high voltage, low current characteristics.
Note is made if ignition of the material takes place.
The number of seconds needed to ignite standard specimens which are wrapped with resistance wire that dissipates a specified level of electrical energy. The temperature index shown in the individual recognition correlates numerically with the temperature in degrees C above which the material is likely to degrade prematurely when based on a comparison with similar results on a material which has had acceptable service experience. More than one Relative Thermal Index may be appropriate for a given material depending on the property requirements for a given application. File E84658N. RTP Company has the ability to precolor select grades of resin from major resin manufacturers and maintain their UL Recognition. Requesting a Yellow Card from RTP Copies of UL Yellow Cards for RTP Company compounds listed in this section are available via fax or postal mail upon request.