SYMPOSIA PAPER Published: 01 January 1999

Engine Coolant Compatibility with the Nonmetals Found in Automotive Cooling Systems


High temperature, short term immersion testing was used to determine the impact of propylene and ethylene glycol base coolants on the physical properties of a variety of elastomeric and thermoplastic materials found in automotive cooling systems. The materials tested are typically used in cooling system hoses, radiator end tanks, and water pump seals. Traditional phosphate or borate-buffered silicated coolants as well as extended-life organic acid formulations were included. A modified ASTM protocol was used to carry out the testing both in our labora-tory and at an independent testing facility. Post-test fluid chemistry including an analysis of any solids which may have formed is also reported. Coolant impact on elastomer integrity as well as elastomer-induced changes in fluid chemistry were found to be independent of the coolant's glycol base.

Author Information

Greaney, JP
ARCO Chemical Company, Newtown Square, PA
Smith, RA
ARCO Chemical Company, Newtown Square, PA
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Developed by Committee: D15
Pages: 168–182
DOI: 10.1520/STP38245S
ISBN-EB: 978-0-8031-5566-4
ISBN-13: 978-0-8031-2610-7