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UL-94 Vertical and Horizontal burning tests
The UL-94 series of flammability tests find widespread use in industry, particularly with regard to the testing of parts and materials used in electrical and electronics applications. The vertical burning test uses a Bunsen burner as the ignition source and specimens are classified according to their burning times as V0 (best), V1, V2 or non-classifiable (fail). A less severe test, in which specimens are mounted horizontally, classifies specimens as HB or fail accordingly.

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