Underwriters Laboratory flammability procedure

Underwriters Laboratories (UL) also approves and rates storage tanks. Factors including tank wall thickness, type of metal used, welding procedure, venting, supports, pressure ratings, and other related topics are specifically defined in the approval codes. Guidelines which relate directly to the storage of flammable and combustible materials are provided under UL Code 142. 

Note flammability is normally tested according to Underwriters Laboratory Procedure UL 94. 

Flame retardancy tests were performed following the procedure of Underwriter s Laboratory Bulletin 94 entitled Tests for Flammability of Plastic Materials, UL94. According to this procedure, materials may be classified as HB, VO, VI, V2, VA and/or VB on the basis of the test results obtained for five samples. In this study, UL test was done at 0.8 mm thickness for all samples. Heat deflection Temperature (HDT, ISO 75/Be flat, 1.8 Mpa load) and Vicat softening temperature (Vicat, ISO 306, Vicat B, heating rate 120 °C/min load of 50 N) were used to determine thermal properties of compositions. Standard impact bars were used to measure these properties. Duplicate measurements were done and average of two samples were reported. 

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See also in sourсe #XX -- [ ]

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