SEDL / STP / STP1335-EB / STP38255S

Silicate Stabilization Studies in Propylene Glycol

Schwartz, SA
Research advisor, ARCO Chemical Company, Newtown Square, PA

Pages: 25    Published: Jan 1999

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Abstract

In most North American and many European coolant formulations, the corrosion inhibition of heat-rejecting aluminum surfaces is provided by alkali metal silicates. But, their tendency towards polymerization, leading to gelation and/or precipitation, can reduce the effectiveness of a coolant. This paper presents the results of experiments which illustrate formulation-dependent behavior of inorganic silicate in propylene glycol compositions. Specific examples of the effects of glycol matrix, stabilizer type, and hard water on silicate stabilization are provided.