Part II: Interpretation of UL yellow card 1. What is a UL yellow card? UL is short for Underwriter Laboratories Inc. The UL Safety Laboratory is the most authoritative in United States and a v...

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 ...