ISO 13468-2-1999 塑料 透明材料光透射率总量的测定 第2部分:双束光发射仪器

标准号：ISO 13468-2-1999
中文标准名称：塑料 透明材料光透射率总量的测定 第2部分:双束光发射仪器
英文标准名称：Plastics - Determination of the total luminous transmittance of transparent materials - Part 2: Double-beam instrument
标准类型：G31
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：G31
国际标准分类号：83.080.01
适用范围：This part of ISO 13468 covers the determination of the total luminous transmittance, in the visible region of the spectrum, of planar transparent and substantially colourless plastics, using a double-beam scanning spectro-photometer. This part of ISO 13468 cannot be used for plastics which contain fluorescent materials. This part of ISO 13468 is applicable to transparent moulding materials, films and sheets not exceeding 10 mm in thickness. NOTE 1 Total luminous transmittance can also be determined by a single-beam instrument as in part 1 of this International Standard. NOTE 2 Substantially colourless plastics include those which are faintly tinted. NOTE 3 Specimens more than 10 mm thick may be measured provided the instrument can accommodate them, but the results may not be comparable with those obtained using specimens less than 10 mm thick.