Part I: Interpretation of UL 94 (the Standard for Safety of Flammability of Plastic Materials for Parts in Devices and Appliances testing)
1. How to understand the 12 classifications in the UL 94?
What materials are they used for and how about their relative ratings?
① UL 94 includes 12 flammability ratings:
2. How to correctly describe the flammability rating of a material?
UL is short for Underwriter Laboratories Inc. The UL Safety Laboratory is the most authoritative in United States and a very large private institution in the world for safety testing and identification.