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XYlink 401 is an aromatic imine-type latent curing agent based on aromatic diamine and ketone/aldehyde. It is a low viscosity liquid, and has good miscibility with -NCO terminated polyurethane prepolymers, and can reduce the viscosity of room temperature curing polyurethane system.

XYlink 3767 is an imide-type aliphatic latent curing agent made from an alicyclic diamine and aldehyde/ketone. It has good compatibility with NCO-terminated prepolymer, and rapidly decomposes when it contacts moisture, the generated amino groups react with isocyanate quickly and gel occur. Thus bubbles and holes formed in polyurethane could be avoided which due to a lot of CO2 generated from isocyanate-water reaction.