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Product overview
UNITHANE 644 WD 55 is an urethane alkyd based on aliphatic isocyanate and was designed particularly with colour retention in mind. The resin can be used in clear and pigmented finishes and is often used in combination with colour retentive long oil alkyds.The excellent colour and gloss retention of UNITHANE 644 WD 55, especially when exposed to ultra violet light, makes it an ideal choice for use in exterior applications, including garden furniture and marine finishing. In clear varnishes UNITHANE 644 WD 55 can be used as the sole medium. For decorative gloss or eggshell finishes, between 20-50% of the urethane resin should be used, the balance being a colour retentive long oil alkyd.The resin is supplied in low aromatic white spirit to enable the formulation of coatings that do not require adverse environmental labelling.
Industrial segment General Industry / ACE, Protective coatings & Marine
Coating layers Pigmented topcoat, Topcoat
Curing type 1K
Performance benefits Chemical resistance, Fast dry, Hardness
Sustainability benefits Renewable content
Viscosity 4500 - 6000 mPa.s (25°C)
% NVC 54 - 56
Volatile Dearomatised white spirit D40
% Fatty acid on solids 54
Fatty acid type Linoleic rich
Color (max) 8 Gardner
Acid value on solids (mg KOH/g) 5 max