K-FLEX 171-90

K-FLEX 171-90 is a chain extended version of K-FLEX 188. Although it is slower reacting in isocyanate crosslinked systems than K-FLEX 188, it offers longer pot life, improved adhesion and flexibility. Because of its lower hydroxyl number, K-FLEX 171-90 requires less crosslinker. K-FLEX 171-90 can also be used as a modifier of aminoplast crosslinked coatings, inks and adhesives to improve flexibility and adhesion.

ADVANTAGES:
Low VOC
High Resistivity
Low Isocyanate Demand
Prolonged Potlife
Good Flow/Leveling
Improved Flexibility
 

TYPICAL PROPERTIES:
Appearance:                            Clear to hazy straw liquid
% Active:                                  90
Viscosity, cPs, 25°C:               3,700    
Hydroxyl number:                    122
Hydroxyl equiv. weight:            460                         
Weight per gallon, 22°C:          9.2 lbs.
Volatile:                                    Butyl acetate/ xylene
 

SOLUBILITY:
Soluble in alcohols, esters, ketones, xylene, Aromatic 100 and Aromatic 150. Partially soluble in mineral spirits. Insoluble in water.
 

TYPICAL USAGE LEVELS:
Typically 5-10% on total resin solids (TRS) for melamine baking systems or 5-25% on TRS for 2-component urethanes.