1.1 本规范涵盖天然块状云母 2. 以及根据本文规定的试验确定的电气、视觉和物理特性，适用于制造固定云母介质电容器的云母膜（切割和未切割）。 1.2 以英寸-磅为单位的数值应视为标准值。 1.3 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 本规范中包含的特性是确定适用于制造固定云母介质电容器的天然块状云母和云母膜（切割和未切割）类型所需的特性。可能需要其他要求来识别特定特征。这些将被添加到规范中，因为它们的包含变得普遍可取，并且必要的测试数据和方法可用。不符合本规范电容器使用要求的天然块状云母和云母膜可能能够满足其他关键电气绝缘目的的要求。 4.2 本规范涵盖的自然块和云母膜（切割和未切割）的电气质量分类系统基于此处规定的云母必须具备的电气和物理性能以及视觉质量的组合。该系统与电容器用云母质量的过去实践和先前概念有根本不同。如果云母符合特定的物理要求，则电气分类系统不会歧视即使是优质电选云母中也存在斑点和污渍。只要云母满足特定的电气和物理要求，所有电气质量等级中也允许存在大量的空气夹杂物和波纹。 无论颜色或产地如何，满足这些要求的云母都是可以接受的。然而，满足这些电气和物理要求但视觉质量低于满足视觉质量分类要求的云母通常不被认为是可取的。 4.3 在电容器制造中，一块或多块低于所需电气和物理性能的切割膜或块状云母可能会妨碍满足电容器的最终要求。因此，要求测试每块（切割）或胶片（切割或未切割）或两者的电气要求，并检查本规范中列出的视觉要求。

1.1 This specification covers natural block mica 2 and mica films (cut and uncut) suitable for use in the manufacture of fixed mica-dielectric capacitors, based on electrical, visual, and physical properties as determined by tests specified herein. 1.2 The values stated in inch-pound units are to be regarded as standard. 1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 The properties included in this specification are those required to identify the types of natural block mica and mica films (cut and uncut) suitable for use in the manufacture of fixed mica-dielectric capacitors. It is possible that other requirements will be necessary to identify particular characteristics. These will be added to the specification as their inclusion becomes generally desirable, and the necessary test data and methods become available. It is possible that natural block mica and mica films that do not conform to the requirements of this specification for capacitor use are capable of meeting the requirements for other critical electrical insulation purposes. 4.2 The system of classifying electrical quality of natural block and mica films (cut and uncut) covered by this specification is based on a combination of electrical and physical properties, and visual qualities specified herein, which the mica must possess. This system differs radically from past practices and previous concepts of mica quality for capacitor use. The electrical classification system does not discriminate against the presence of spots and stains in even first quality electrically selected mica, provided the mica conforms to specific and physical requirements. Appreciable amounts of air inclusions and waviness also are permitted in all electrical quality classes, provided the mica meets specific electrical and physical requirements. Mica meeting these requirements is acceptable without regard to color or origin. However, mica meeting these electrical and physical requirements but having lower visual quality than that meeting the requirements for the visual quality classification is not considered generally as desirable. 4.3 In capacitor fabrication, one or more pieces of cut film or block mica having lower than required electrical and physical properties will possibly prevent meeting the end requirements of the capacitor. It is therefore required that each piece of block (cut) or film (cut or uncut), or both, be tested for the electrical requirements and inspected for the visual requirements listed in this specification.