Paper, board and pulps; Measurement of diffuse reflectance factor

This document establishes a standardized methodology for determining the diffuse reflectance factor of paper, paperboard, and pulp materials. The procedure outlines the necessary conditions for test samples, including their preparation and conditioning, to ensure consistent and reproducible results across different laboratories and geographical regions. It specifies the optical equipment requirements, such as light sources and detectors, along with the geometric configuration for illumination and viewing. The standard defines the calculation methods for converting instrumental measurements into the diffuse reflectance factor value, accounting for the specific wavelengths typically used in the industry. By adhering to this protocol, stakeholders involved in the paper and pulp manufacturing sectors can effectively evaluate the optical properties of their products. The approach facilitates comparison of material quality and supports quality control processes without requiring specialized facilities beyond those defined in the scope. This technical specification serves as a reference for manufacturers, testers, and regulatory bodies to maintain uniformity in reporting optical characteristics for various paper-based materials.