ISO 20843:2010 specifies a test method to determine the pH value of non-flammable fluids within categories HFAE, HFAS and HFC, as classified in ISO 6743â€'4.
DS/EN ISO 20843:2011 history
2011DS/EN ISO 20843:2011 Petroleum and related products - Determination of pH of fire-resistant fluids within categories HFAE, HFAS and HFC