The BS EN ISO 8254-1-2009 Determination of specular gloss of paper and Cardboard at 75 ° incident angle using the TAPPI method specifies a method for measuring specular gloss of paper and Cardboard at 75 ° incident angle using the convergent beam of light method. Specular gloss reflects the ability of a paper surface to reflect light, often affecting its visual effect and printing quality. The standard describes in detail the use of instruments, sample preparation, measurement process and environmental conditions requirements based on the TAPPI method. This method enables accurate measurement of surface gloss of paper and Cardboard, and is widely used in quality control in paper production and printing industries.