The majority of plastic materials used are flammable.
However, plastics are used across almost all industry sectors, some of which require products with a degree of flame retardancy.
UL 94 is a plastics flammability standard released by the Underwriters Laboratories of the United States. This standard determines the material’s tendency to either extinguish or spread the flame once the specimen has been ignited. This is a standard that is widely accepted around the world.
There are 6 UL94 classifications for the flammability of plastic materials, these are from lowest (Most Flammable) to highest (Least Flammable).
Plastic materials can be tested by the Underwriters Laboratories and receive a UL Yellow Card, which is a UL Recognised Component Mark; they can also be tested against these standards, in-house, by plastic material producers but this will not result in a Yellow Card being issued.