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Glycols and Engine Coolants
Automotive engine coolants for light duty service are based on ethylene glycol or propylene glycol. They are provided either as concentrates (40 to 70% glycol), or as pre-diluted, ready to use glycol base engine coolants (50 vol% minimum). The specification for engine coolant for heavy-duty use is ASTM D 6210. STM D 3306 specification relates to engine coolants made from new or virgin ingredients. It also applies to coolants made from recycled or reprocessed glycol coolant or from reprocessed industrial source glycol. The glycol for the ASTM D 3306 Specification must meet the freezing point requirements of ASTM D 1177.
These are separate specifications in ASTM D 6471 and ASTM D 6472 for engine coolants prepared from reprocessed and recycled glycols which do not meet the freezing point requirements according to ASTM D 1177. These coolants must be further evaluated to identify the trace metals and other chemical compounds that may be present.