标准摘要
[中文适用范围]： 本国际标准规定了测定由以下原因引起的照相胶片和相纸尺寸变化的方法： ——由于大气相对湿度（RH）变化（湿度膨胀系数）而导致的平衡水分含量变化； ——温度变化（热膨胀系数）； - 加工; ——老化。 本国际标准涉及测量前样品的水分含量和热历史、测量期间的大气条件以及数据的处理。 它没有描述用于进行测量的各种实验技术。 本国际标准不适用于测定即时摄影胶片的尺寸变化。 [外文原描述]： ISO 18903:2002 specifies a method for determining the dimensional change of photographic films and papers caused by: variations in equilibrium moisture content due to change in the relative humidity (RH) of the atmosphere (humidity coefficient of expansion); change in temperature (thermal coefficient of expansion); processing; ageing. ISO 18903:2002 deals with the moisture content and thermal history of the specimens before measurement, the atmospheric conditions during measurement, and the treatment of the data. It does not describe the various experimental techniques used to make the measurements. This International Standard is not suitable for determining the dimensional change of instant photographic film.
英文名称Imaging materials — Films and paper — Determination of dimensional change