This standard specifies how to determine the total light transmittance and total light reflectance in the visible range of transparent, translucent, and opaque plastics in the form of plates and films.
JIS K 7375:2008 Referenced Document
JIS K 7100 Plastics -- Standard atmospheres for conditioning and testing
JIS K 7361-1 Plastics -- Determination of the total luminous transmittance of transparent materials -- Part 1: Single beam instrument
JIS Z 8402-2 Accuracy (trueness and precision) of measurement methods and results -- Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method