SYMPOSIA PAPER Published: 01 January 1964

The Prediction of Coating-Grade Asphalt Weatherability from Asphaltene-Dispersibility Data


The dispersibility of the least soluble asphaltenes shows a good linear correlation with Weather-Ometer durability for coating-grade asphalts made by air blowing straight-run, blended crude oil, ferric-chloride-catalyzed residua, and oil fluxed stocks. Asphalts blown from phosphoric-acid-catalyzed residua show poor correlation.

A modification of the original procedure for titration of the xylene solutions of asphalt with n-heptane is presented. The modified method eliminates back-titrations that prove troublesome with some asphalts. Repeatability and reproducibility for these asphalts is improved over results obtained with the original procedure.

Author Information

Jones, T., K.
California Research Corp., Richmond, Calif.
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Developed by Committee: D08
Pages: 48–57
DOI: 10.1520/STP44534S
ISBN-EB: 978-0-8031-5990-7
ISBN-13: 978-0-8031-6144-3