hdi closed  bi-301 about:  coronate® bi-301, in the form of a pale yellow to brownish flakes, is an isocyanate that is masked with blocking agents (e-caprolactam and phenol). this blocked isocyanate can be applied as baking finishes for coil coatings, wire, rubber, plastics, metals, and more. storage and transportation: storage: it is recommended to store...