UL94 Flammability Rating – Application Note


All of BAPI’s indoor sensor bodies and transmitter enclosures are made from UL94, V-0 rated plastics.

UL94 serves as a preliminary indication of a plastic’s acceptability for use as part of a device or appliance with respect to its flammability. It is not intended to reflect the hazards of a material under actual fire conditions.

The 94HB test describes the Horizontal Burn method. Methods 94V and 94VTM are used for Vertical Burn, a more stringent test than 94HB. The 94-5V test is for enclosures for products that are not easily moved or are attached to a conduit system. The 94HBF and HF are used for nonstructural foam materials.

 

 

UL 94 Flammability Rating Summary

 

5VA Surface Burn

Burning stops within 60 seconds after five applications of five seconds each of a flame (larger than that used in Vertical Burn testing) to a test bar. Test specimens MAY NOT have a burn-through (no hole). This is the highest (most flame retardant) UL94 rating.

5VB Surface Burn

Burning stops within 60 seconds after five applications of five seconds each of a flame (larger than that used in Vertical Burn testing) to a test bar. Test specimens MAY HAVE a burn-through (a hole).

V-0 Vertical Burn

Burning stops within 10 seconds after two applications of ten seconds each of a flame to a test bar. NO flaming drips are allowed.

V-1 Vertical Burn

Burning stops within 60 seconds after two applications of ten seconds each of a flame to a test bar. NO flaming drips are allowed.

V-2 Vertical Burn

Burning stops within 60 seconds after two applications of ten seconds each of a flame to a test bar. Flaming drips ARE allowed.

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.

 

If you have any questions, please call your BAPI representative.


Printable pdf Version of this Application Note

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