K-KAT 348

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K-KAT 348 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.

Can be used in ambient, force dry and bake systems
Excellent gloss retention
Excellent exterior durability
Good catalysis of secondary hydroxyls

Appearance:                                    Clear, straw liquid
% Active (as metal carboxylate):     75
% Metal:                                           25
Specific gravity, 25°C:                     1.24 g/ml

K-KAT 348 is soluble in aromatics, aliphatics and glycol ethers. It has limited solubility in esters and alcohols. K-KAT 348 is insoluble in water.

K-KAT 348 is recommended for 2K and blocked isocyanate coatings. K-KAT 348 can replace many heavy metal and/or toxic catalysts used in the production of urethane elastomers, foams and coatings. K-KAT 348 is especially effective in cationic electro-coatings based on blocked isocyanates.

One component formulations based on blocked isocyanates generally require higher catalyst levels than 2-component (2K) systems. Levels of 0.5 -2.0% K-KAT 348 as supplied by weight on resin solids should be used with blocked isocyanates while 0.03 - 0.1% is recommended for 2K coatings.

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