Method of test for pulp and paper, Method 421: Paper, board and pulps - Determination of pH of aqueous extracts - Cold extraction
纸浆和纸的试验方法 方法421:纸、纸板和纸浆.水提取物pH值的测定.冷萃取
This document adopts ISO 6588-1:2020, which specifies a method for the determination of the pH-value defined by the electrolytes extractable by cold water from a sample of paper, board or pulp.