標準號：BS EN ISO 13468-1-1997
中文標準名稱：塑料.透明材料光透射率總量的測定.單束光發射儀器
英文標準名稱：Plastics. Determination of the total luminous transmittance of transparent materials. Single-beam instrument
標準類型：G31
發布日期：1997/1/15 12:00:00
實施日期：1997/1/15 12:00:00
中國標準分類號：G31
國際標準分類號：83.080.01
適用范圍：This part of ISO 13468 covers the determination of the total luminous transmittance, in the visible region of the spectrum, of planar transparent and substan-tially colourless plastics, using a single-beam photo-meter with a specified CIE standard light source and photodetector. 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. NOTES 1 Total luminous transmittance can also be determined by a double-beam spectrophotometer as in part 2 of the stan-dard. Part 1, however, provides a simple but precise, prac-tical and quick determination. This method is suitable for use not only for analytical purposes but also for quality control. 2 Substantially colourless plastics include those which are faintly tinted. 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.