Substrate gasoline resistance

Their multiple use-forms (e.g., in in situ-XQ-acting, neat, liquid systems solutions aqueous dispersions films webs powders) and other valuable attributes (e.g., adhesion to a variety of substrates vibration-damping bonds " gasoline, oil, and solvent resistance etc.) continue to make polyurethane- and isocyanate-based adhesives the materials of choice in many adhesive applications. 

The use of a primer to promote adhesion and fill in voids in the substrate can help to improve part appearance and quality. The use of adhesion promoters on olefinic substrates such as TPO and PP not only is necessary for adhesion but also dramatically influences other properties such as gasoline, gasohol, and even gouge resistance. Adhesion promoters for TPO and polypropylene (PP) are commonly chlorinated based polyolefin (CPO) primers (64) that contain a co-resin, conductive carbon black, and hydrocarbon solvents for optimum CPO solubUity. Other resins can also be beneficial in improving adhesion especially under humidity conditions (65). 

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