STP1335

    Engine Coolant Compatibility with the Nonmetals Found in Automotive Cooling Systems

    Published: Jan 1999


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    Abstract

    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.

    Keywords:

    compatibility, cooling system, elastomer, engine coolant, organic acid, physical properties, rubber compounds, silicate


    Author Information:

    Greaney, JP
    Senior research chemist and principal analytical chemist, ARCO Chemical Company, Newtown Square, PA

    Smith, RA
    Senior research chemist and principal analytical chemist, ARCO Chemical Company, Newtown Square, PA


    Paper ID: STP38245S

    Committee/Subcommittee: D15.03

    DOI: 10.1520/STP38245S


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