K-FLEX A307 is a low viscosity, 100% solids linear, saturated, aliphatic polyester diol with primary hydroxyl groups. This product was designed as a flexibility modifier for acrylic/isocyanate and acrylic/melamine systems. The low hydroxyl number minimizes the crosslinker demand.
Good balance of surface dry/pot life in 2K PU
Low isocyanate demand
No acid functionality
Appearance: Clear, viscous liquid
% Nonvolatile, 1 Hr @ 110°C: 97
Viscosity, cPs, 25°C: 5,400
Hydroxyl number: 140
Hydroxyl equiv. weight: 400
Acid number: 0.1
Weight per gallon, 22°C: 9.25 lbs.
Soluble in alcohols, esters, ketones, xylene, Aromatic 100 and Aromatic 150. Partially soluble in mineral spirits. Insoluble in water.
TYPICAL USAGE LEVELS:
5-25% replacement of primary backbone resin.