What is UL94 HB rating?
What is UL94 HB 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.
What is HB flammability rating?
UL 94 Classification and Flame-Retardant Thermoplastics
| UL 94 Rating | Definition of Rating |
|---|---|
| HB | Slow burning on a horizontal part |
| V-2 | Burning stops within 30 seconds on a part allowing for drops of vertical flammable plastic. |
What does flammability rating mean?
The horizontal burning test is used to determine the HB flammability rating of a material. The flammability rating is calculated for a test specimen as a function of the burning rate and taking account of the material thickness.
What is a V-2 flame rating?
V-2: burning stops within 30 seconds on a vertical specimen; drips of flaming particles are allowed. V-0: burning stops within 10 seconds on a vertical specimen; drips of particles allowed as long as they are not inflamed.
What does self-extinguishing mean?
McGraw-Hill Dictionary of Scientific and Technical Terms defines self-extinguishing as ‘the ability of a material to cease burning once the source of the flame has been removed’.
What is V2 rating?
Vertical Ratings, V2, V1 and V0 indicate that the material was tested in a Vertical Position and self-extinguished within a specified time after the ignition source was removed.
What is a V 2 flame rating?
Are cigarettes self-extinguishing?
Since January 1, 2007, the California Cigarette Fire Safety and Firefighter Protection Act (Act) allows only cigarettes certified and marked by the manufacturer as self-extinguishing to be sold in California.
What is a self-extinguishing plastic?
SELF-EXTINGUISHING is a term applied to plastics and resins which will not support combustion in the absence of an outside flame. However, these products may be combustible as long as a flame is applied to them. One of the earliest applications of these plastics was in the manufacture of air ducting in aircraft.
What is ul flammability?
UL 94 flammability tests explained. UL 94 is defined as the “Standard for Safety of Flammability of Plastic Materials for Parts in Devices and Appliances testing”. This plastics flammability standard is issued by Underwriters Laboratories of the USA.
What is the flammability rating?
Flammability. The ratings achieved are used in building codes, insurance requirements, fire codes and other regulations governing the use of building materials as well as the storage and handling of highly flammable substances inside and outside of structures and in surface and air transportation.
What is the flammability test?
Flammability testing is the principle way to determine how easily a material or finished product will ignite or burn when placed or used in close proximity to fire or heat.