Screening of Plastics for Fire Performance Underwriters Laboratories (UL) 94 is one of the most widely used flammability tests for determining relative flammability for plastic materials. It measures the ability of plastic parts to extinguish the flame after ignition and its dripping behavior in response to a small open flame or radiant heat source under controlled laboratory conditions.
The tests results are intended to serve as a preliminary indication of the material’s suitability with respect to flammability for a particular application, such as plastic materials used for parts in electronic devices and appliances.