Flammability testing determines how easily a material or finished product will ignite or burn when exposed to or used near fire or heat.

Flame retardants are chemicals that are applied to materials to prevent the start or slow the growth of fire. They have been used in many consumer and industrial products since the 1970s, to decrease the ability of materials to ignite.

V-0: burning stops within 10 seconds on a vertical specimen; drips of particles allowed as long as they are not inflamed. 5VB: burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may develop a hole.

Flame resistant plastics according to UL94

Classification of flame resistant plastics according to UL94 follows these criteria: UL94-HB plastic (horizontal burning): Material burns and drips. HB plastics. UL94-V0 plastic (vertical burning): Burning period 10 seconds.