The TCVN 10974-2-2015 standard specifies a 75 degree gloss measurement method (DIN method) using a parallel beam of light to determine the specular gloss of paper and Cardboard. This method is suitable for paper and Cardboard surfaces with a gloss below 65 and is particularly suitable for surfaces with a gloss below 20. The method can also be used for materials containing Optical inspection whitening agents. The standard details the Optical inspection conditions for testing, instrument calibrating and measurement procedures to ensure accuracy and conformity of measurement results.