K-KAT XK-633 is a zinc carboxylate catalyst recommended for solventborne or solvent-free 2K PU coatings and 1K blocked isocyanate systems. It is FDA 175.300 compliant.

K-KAT XK-633 can be used in combination with K-KAT XK-651 to provide good through cure of 2K PU systems. 

Metal Type Zinc carboxylate
% Active 18
Market Application 2K PU
Application Advantage Back end cure
Application Advantage Hydrolytic stability
Application Advantage FDA approvable
Application Advantage Tin-free
Market Application 1K blocked NCO
Product Group Catalyst (tin-free)