3,5-Dimethylpyrazole (3,5-DMP): Isocyanate Blocking And Grade Selection 3,5-Dimethylpyrazole (3,5-DMP, CAS 67-51-6) is used as an isocyanate blocking agent in heat-activated polyurethane coating systems. This guide explains documented HDI/IPDI applications, factors affecting deblocking and curing, and how to evaluate assay, moisture and batch COA data. It also distinguishes 3,5-DMP from DMPP and explains the limits of published soil-incubation research.
