UL 94, the Standard for Safety of Flammability of Plastic Materials for Parts in Devices and Appliances testing, is a plastics flammability standard released by Underwriters Laboratories of the United States. [1] . The standard determines the material's tendency to either extinguish or spread the flame once the specimen has been ignited.

There are 12 UL 94 specified flame classifications assigned to materials based on the results of these small-scale flame tests.

UL 94 is a safety standard to determine the flammability of plastic materials. This test is released by Underwriters Laboratories of the United States. It measures: The ability of the plastic part to extinguish or spread the flame after ignition.

If you are designing or selecting plastics, understanding UL94 ratings ensures compliance with safety regulations and reduces fire hazards. This guide covers everything you need to know about UL 94 flammability ratings, test methods, and applications.

As related to plastic materials offered by Professional Plastics, there are 6 Flame Classifications Specified in UL 94 that are assigned to materials based on the results of these small-scale flame tests.

Jul 15, 2019 · Two UL 94 ratings that code officials commonly run across are HB and V (V-0, V-1, or V-2). These ratings are established using small-scale tests in which approximately 5 by ½ inch samples are subject to a ¾ inch, 50W tirrel burner flame ignition source.

Feb 28, 2023 · UL 94 | UL Standards & Engagement | UL Standard | Edition 7 | Tests for Flammability of Plastic Materials for Parts in Devices and Appliances | Published Date: February 28, 2023 | ANSI Approved: January 05, 2024

Let’s shed some light on what the UL 94 Standard and its associated flammability ratings are and, more importantly, what they are not. Model building, life safety and fire codes include numerous requirements that products and materials include specified minimum flammability ratings.

Mar 1, 2019 · 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 also describes a method in which the test flame is applied for up to five applications in testing for a 5VA or 5VB classification. These small-scale tests measure the propensity of a material to extinguish or spread flames once it becomes ignited.