K-KAT XK-640

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K-KAT XK-640 is a versatile bismuth carboxylate catalyst designed for blocked isocyanate and two component urethane coatings. It can provide similar properties to standard tin catalysts without the environmental drawbacks. K-KAT XK-640 is designed to provide improved hydrolytic stability compared to other bismuth carboxylate catalysts.

Can be used in ambient, force dry and bake systems
Excellent gloss retention
Excellent exterior durability

Appearance:                                   Clear, amber liquid
% Metal:                                         18
Specific gravity, 25°C:                    1.12 g/ml

K-KAT XK-640 is soluble in aromatics, aliphatics and glycol ethers. It has limited solubility in esters and alcohols. K-KAT XK-640 is insoluble in water.

K-KAT XK-640 is recommended for 2K and blocked isocyanate coatings. K-KAT XK-640 can replace many heavy metal and/or toxic catalysts used in the production of urethane elastomers, foams and coatings.

0.05 – 0.2% as supplied on total resin solids for 2-component polyurethane systems.
1.0 – 2.5% as supplied on total resin solids for blocked isocyanate systems. 

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