UL 94 includes 12 flame classifications

We’ve been told that an insulated cover we’re fabricating has to meet UL HB. What does that mean?

Underwriters Laboratories, an independent product safety certification organization, writes a number of specifications, including the flammability specification UL 94. UL 94 is titled “Standard for Flammability of Plastic Materials for Parts in Devices and Appliances,” and includes 12 flame classifications. HB is among the six classifications relating to materials used in manufacturing enclosures, structural parts and insulators found in consumer electronic parts. An HB flame rating means that the material was tested in a horizontal position. For more information, contact:

SOURCE Underwriters Laboratories Inc.

Juli Case is IFAI’s information and technical services manager.