UL 94 STANDARD FOR SAFETY Tests for Flammability of PlasticMaterials for Parts in Devices and Appliances
1 Scope
1.1These requirements cover tests for flammability of polymeric materials used for parts in devices andappliances. They are intended to serve as a preliminary indication of their acceptability with respect toflammability for a particular application.
1.2The methods described in this Standard involve standard size specimens and are intended to beused solely to measure and describe the flammability properties of materials,used in devices andappliances，in response to a small open flame or radiant heat source under controlled laboratoryconditions.
1.3 The tests in the Standard for Tests for Flammability of Small Polymeric Component Materials shouldbe used to evaluate small components which contain materials that can not be fabricated intostandardized specimens in the minimum use thickness and subjected to applicable preselection tests inUL94.Test procedures in UL 1694 are applicable to small components with an overall volume of less than2500 mm3 (0.15 in3). UL 1694 is generally not applicable to small components with an overall volumegreater than 2500 mm3(0.15 in3).
1.4 The final acceptance of the material is dependent upon its use in complete equipment that conformswith the standards applicable to such equipment. The flammability classification required of a material isdependent upon the equipment or device involved and the particular use of the material.The performancelevel of a material determined by these methods shall not be assumed to correlate with its performance inend-use application.The actual response to heat and flame of materials depends upon the size and form,and also on the end-use of the product using the material.Assessment of other important characteristics inthe end-use application includes, but is not limited to, factors such as ease of ignition, burning rate, flamespread, fuel contribution, intensity of burning, and products of combustion.
1.5lf found to be appropriate, the requirements are applied to other nonmetallic materials.
1.6These tests,with the exception of the Radiant Panel Test in Section 10, are not applicable to theevaluation of parts where the thickness exceeds 13.0 mm or where the surface area exceeds 1 m?.Theserequirements do not cover polymeric materials when used for building construction, finishing, or contentssuch as wall and floor coverings,furnishings,decorative objects and so forth. In addition,the fireresistance (in terms of an hourly rating), flame spread, smoke characterization, and heat release rate isnot evaluated.Other fire tests exist and shall be used to evaluate the flammability of materials in theintended end-use-product configuration.
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