ASTM E1177-23 pdf download – Standard Specification For Engine Coolant Grade Glycol.
This specification outlines the testing procedures and requirements for four grades of engine coolant based on ethylene glycol and propylene glycol. This includes both virgin glycols and those produced from the recycling of vehicle engine coolants and industrial source glycols. Types EG-1 and PG-1 refer to glycols that have sufficiently low levels of certain components, enabling a blended coolant to satisfy most OEM (Original Equipment Manufacturer) specifications. These grades are likely to be composed of virgin materials, although redistillation could yield a product that meets the necessary purity standards. Types EG-2 and PG-2 are designated for glycols that are suitable for use in various coolants and can be either redistilled or virgin.
Commercial products must be properly sampled and tested, ensuring they meet the specified values for the following physical and chemical properties: clarity; color (measured on the Pt/Co scale); relative density; pH when diluted in distilled water; acidity expressed as acetic acid; mass composition of individual glycols (including ethylene glycol, propylene glycol, dipropylene glycol, and others); total mass composition of all glycols; water content; glycol ester content; and maximum allowable concentrations for nitrites, nitrates, phosphates, silicon, chloride, sulfate, boron, aluminum, calcium, copper, iron, magnesium, lead, zinc, and iron.
