1.1本性能规范涵盖了暴露于瞬时电弧和相关热危害的电气工人穿着服装所用纺织材料的阻燃性。 注1-本性能规范不包括雨衣中常用的涂层织物。 注2-目前，实验室使用的台架电弧测试不可用。委员会的目的是继续根据电弧暴露或可接受的替代方案寻求可接受的实验室试验，这将构成本规范修改的基础。 1.2涵盖用于基本防护等级的材料。 1.3防护性能与瞬时电弧的热暴露以及明火和辐射热的相关暴露有关。 （见附录X1。） 1.4本性能规范涵盖了专门与防止接触瞬时电弧以及与服装效用相关的服装设计特征。 注3-许多其他热试验方法正在考虑和开发中，当F18委员会评估并证明有效时，将纳入本规范或适当的替代试验方法或规范。 1.5 本标准应用于评估和描述受控实验室条件下材料、产品或组件对热和火焰的响应特性。它不应用于描述或评估实际火灾条件下材料、产品或组件的火灾危险或火灾风险 1.5.1本评估结果可作为火灾风险评估的要素，该评估考虑了与特定最终用途火灾危险评估相关的所有因素。 1.6以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.7以下预防性警告仅适用于本性能规范第8节的试验方法部分: 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。

1.1 This performance specification covers the flame resistance of textile materials to be used for wearing apparel for use by electrical workers exposed to momentary electric arc and related thermal hazards. Note 1—This performance specification does not cover coated fabrics commonly used in rainwear. Note 2—At present, a bench scale arc test for laboratory use is not available. It is the intent of the committee to continue the search for an acceptable laboratory test based on either an electric arc exposure or an acceptable alternative, which will form the basis of a modification of this specification. 1.2 Materials used for basic protection levels are covered. 1.3 Protective properties relate to thermal exposure from momentary arc and associated exposure to open flame and radiant heat. (See Appendix X1.) 1.4 This performance specification covers wearing apparel design characteristics that relate specifically to protection from exposure to momentary electric arc and that relate to the utility of the wearing apparel. Note 3—A number of other thermal test methods are under consideration and development and, when evaluated and proved effective by Committee F18, will be incorporated in either this specification or an appropriate alternative test method or specification. 1.5 This standard should be used to evaluate and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions. It should not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions 1.5.1 The results of this evaluation may be used as elements of a fire-risk assessment that takes into account all of the factors that are pertinent to an assessment of the fire hazard of a particular end use. 1.6 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.7 The following precautionary caveat pertains only to the test methods portion, Section 8, of this performance specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.