What is UL flammability rating?
UL 94 is a plastics flammability standard released by the Underwriters Laboratories (USA). The standard classifies plastics according to how they burn in various orientations and part thicknesses from the lowest flame-retardant to most flame-retardant in six different classifications. UL 94 Rating.
What does UL94 HB mean?
Slow horizontal burn test
FEATURES AND BENEFITS of UL 94 Flame Classifications UL 94 V-2 Vertical Burn; Burning stops within 60 seconds, Flaming drips ARE allowed. UL 94 H-B Horizontal Burn; Slow horizontal burn test (H-B) are considered “self-extinguishing”. This is the lowest (least flame retardant) UL94 rating.
What does UL 94 HB mean?
What is UL 5VA?
5VA: burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may not develop a hole.
What does UL 94 v0 mean?
Flammability UL 94 V method “evaluates both the burning and afterglow times after repeated flame application and dripping of the burning test specimen” in a vertical burning test.
What is HB flame class?
H-B Horizontal Burn Slow horizontal burning on a 3mm thick specimen with a burning rate is less than 3”/min or stops burning before the 5” mark. H-B rated materials are considered “self-extinguishing”. This is the lowest (least flame retardant) UL94 rating.
What is UL safety rating?
The UL Listed seal means that the product has been tested by UL to nationally recognized safety and sustainability standards. Additionally, it has been found to be free from a reasonably foreseeable risk of fire, electric shock in a Division 2 environment.
What is UL safety standards?
Safety standards are written documents that outline the process in which a product is tested to help mitigate risk, injury or danger. UL is a standard-setting organization, combining extensive safety research, scientific expertise and uncompromising focus on quality to help create a safer world.
What plastics are flame retardant?
Flame retardants are added to polyolefins, polycarbonate, polyamides, polyester, and other polymers to increase resistance to ignition, reduce flame spread, suppress smoke formation, and prevent a polymer from dripping.
What is a HB flame rating?
H-B Horizontal Burn Slow horizontal burning on a 3mm thick specimen with a burning rate is less than 3”/min or stops burning before the 5” mark. H-B rated materials are considered “self-extinguishing”. This is the lowest (least flame retardant) UL94 rating. Rev.