ISO 20843:2011

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Petroleum and related products — Determination of pH of fire-resistant fluids within categories HFAE, HFAS and HFC

ISO 20843:2011 is an international standard that specifies a test method to determine the pH value of fire-resistant fluids categorized as HFAE, HFAS, and HFC, as classified within ISO 6743-4; essentially, it outlines a procedure to measure the acidity or alkalinity of specific types of fire-resistant liquids used in industrial applications.