UL 94-2016 pdf download

UL 94-2016 pdf download.Tests for Flammability of Plastic Materials for Parts in Devices and Appliances.
8.3.1 All specimens are to be cut from sheet material, or are to be cast or injection, compression, transfer or pultrusion molded to the necessary form. After any cutting operation, care is to be taken to remove all dust and any particles from the surface: cut edges are to have a smooth finish. Fabrication of test specimens shall be in accordance with current ASTM Practices.
8.3.2 Standard bar specimens are to be 125 ±5 mm long by 13.0 ±0.5 mm wide, and provided in the minimum and maximum thicknesses. The minimum thickness shall be limited to 0.025 mm. except as indicated in 8.1.2. The maximum thickness is not to exceed 13 mm. Specimens in intermediate thicknesses are also to be provided and shall be tested if the results obtained on the minimum or maximum thickness indicate inconsistent test results. Intermediate thicknesses are not to exceed increments of 3.2 mm. Also, the edges are to be smooth. and the radius on the corners is not to exceed 1.3 mm.
8.3.3 Material Ranges — If a material is to be considered in a range of colors, densities. melt flows, or reinforcement, specimens representing these ranges are also to be provided.
8.3.4 Specimens in the natural and in the most heavily pigmented light color (often white) and dark color (often black/including carbon black) are to be provided and considered representative of the color range, if the test results are essentially the same. In addition, a set of specimens is to be provided in the heaviest organic pigment loading (not carbon black), unless the most heavily pigmented light and dark colors include the highest organic pigment level. When certain color pigments (for example, red. yellow, or the like) are known to affect flammability characteristics, they are also to be provided.
8.3.5 Specimens in the extremes of the densities, melt flows and reinforcement contents are to be provided and considered representative of the range, if the test results are essentially the same. If the burning characteristics are not essentially the same for all specimens representing the range. evaluation is to be limited only to the materials in the densities, melt flows, and reinforcement contents tested. or additional specimens in intermediate densities, melt flows, and reinforcement contents are to be provided for tests.
8.4 Conditioning
8.4.1 Two sets of five specimens are to be preconditioned as in 6.1.
8.4.2 Two sets of five specimens each are to be preconditioned as in 6.2.
8.5 Procedure
8.5.1 Clamp the specimen from the upper 6 mm of the specimen. with the longitudinal axis vertical, so that the lower end of the specimen is 300 ±10 mm above a horizontal layer of not more than 0.08 g of absorbent 100 percent cotton thinned to approximately 50 x 50 mm and a maximum thickness of 6 mm (See Figure 8.1).
8.5.2 Adjust the burner and confirm the nominal 50 W test flame as specified in 7.5.3 — 7.5.5.
8.5.3 The burner shall approach the specimen horizontally from the wide face at a rate of approximately
300 mm’sec. Apply the flame centrally to the middle point of the bottom edge of the specimen so that the top of the burner is 10 ±1 mm below that point of the lower end of the specimen, and maintain it at that distance for 10 ±0.5 seconds starting when the flame is fully positioned under the specimen, moving the burner as necessary in response to any changes in the length or position of the specimen. If the specimen shrinks, distorts, or melts, the point of application shall remain in contact with the major portion of the specimen.