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]

Requirements for V-2 The specimens may not burn with flaming combustion for more than 30 seconds after either application of the test flame. The total flaming combustion time may not exceed 250 seconds for the 10 flame applications for each set of 5 specimens.

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.

V-0: After two 10-second burning tests are performed on the specimen, the flame is extinguished within 10 seconds. Testing Methods. UL94 flammability test includes the following 4 methods: 1. Horizontal burning test for UL94 HB rated materials; 2. Vertical burning test for UL94 V-0, V-1, and V-2 rated materials; 3.

Jul 12, 2024 · The classifications V-0, V-1, and V-2 provide a hierarchy of flame resistance, with V-0 indicating the highest level of flame retardancy, followed by V-1 and V-2.

Requirements for V-2 1. The specimens may not burn with flaming combustion for more than 30 seconds after either application of the test flame. 2. The total flaming combustion time may not exceed 250 seconds for the 10 flame applications for each set of 5 specimens. 3.

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Aug 26, 2022 · V-0: The flame was extinguished within 30 seconds after two 10-second burn tests on the sample. No burning objects should fall. V-1: After the sample was subjected to two 10-second burn tests, the flame was extinguished within 60 seconds.

V-0: burning stops within 10 seconds on a vertical specimen; drips of particles allowed as long as they are not inflamed. 5VB: burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may develop a hole.

The V-1 flying bomb (German: Vergeltungswaffe 1 "Vengeance Weapon 1" [a]) was an early cruise missile. ... The front windscreen had 75 mm (3.0 in) thick bulletproof glass for pilot protection. The V1 pilot's kit consisted of a parachute, helmet and life vest.