1.1本试验方法包括在观察光投射到塑料膜上时在屏幕上形成的图像时，测定塑料膜中存在的凝胶数量。 1.2本规范涵盖的薄膜厚度为100μm（0.004 in.）或更少。 1.3本标准无意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。 注1-没有类似或等效的ISO标准。

1.1 This test method covers the determination of the number of gels present in plastic film when observing the images formed on a screen when light is projected through the film. 1.2 The thickness of the films covered by this specification is 100 [mu]m (0.004 in.) or less. 1.3 This standard does not purport to address all of the safety problems, 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. Note 1-There is no similar or equivalent ISO standard.