Chemical Resistance of Thermosetting Resins Used for Cured-in-Place Pipeby Doug Kleweno, Dow Chemical Co, Texas Div, Freeport, United States,
Abstract: This paper summarizes the chemistry, short term physical properties, and long term chemical resistance for representative epoxy vinyl ester, epoxy, and polyester resins that are currently used for making cured-in-place pipe. In addition, this paper attempts to distinguish the difference between short term and long term performance properties since they are quite different property performance measures and are often misinterpreted. Conclusions drawn from this report indicate the epoxy vinyl ester, epoxy, and polyester resins have different short term flexural and tensile properties with the polyester being relatively brittle, the epoxy resin being most flexible, and the epoxy vinyl ester having a balance of stiffness and high strength. The long term chemical resistance distinguished the three types of resins even more clearly. Overall, the epoxy resin performance was comparatively poor, the polyester performed at an intermediate level, and the epoxy vinyl ester performance was superior to either of the other two.
Subject Headings: Epoxy | Chemical properties | Load and resistance factor design | Physical properties | Pipelines | Curing | Chemicals
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