Metal Finishing Guide Book

2012 Organic Finishing Guidebook Issue

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1) of the various commercial polyisocyanates. Each polyisocyanate offers dis- tinct advantages and disadvantages depending upon the performance require- ments of the finished product. These characteristics must be considered by the formulator prior to the start of the formulation process. Coatings made with IPDI trimer are harder, have higher tensile properties, and better chemical resistance than coatings made with HDI-based polyisocyanates, as illustrated in Table II. To take advantage of both sets of performance charac- teristics, coating formulators typically blend IPDI trimers with HDI-based adducts to enhance the performance of the finished coating. HDI and IPDI 87

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