Unilink® 4200 is an aromatic diamine chain extender and curative designed to cross-link polyurethane (PU) elastomers.
Unilink® 4200 is a relatively low reactivity chain extender that can be used in TDI and MDI formulations. This cross linker is great for improving the increasing the tear strength and load bearing of flexible PU foams and will improve the compressive strength of rigid (PU) foams. In addition, Unilink® 4200 allows coatings, sealants, and adhesives that it cures to adhere better and develop smoother surfaces. It has low moisture sensitivity, it is compatible with most polyols and polyurethane chemicals, and is easy to handle and store.
Appearance: Clear, light to dark brown liquid
Hydroxyl number: 362
Flash Point, PMCC, °C, min: 161
Specific gravity @ 26.7°C: 0.98-0.99
Density, g/ml: 0.995
Water Content, ppm, max: 500
Molecular Weight: 310
Equivalent Weight, min: 153
Primary Chemistry: Aromatic Diamine
Low moisture sensitivity
Compatible with most polyurethane chemicals
Easy to handle
Excellent storage stability in polyols
Improves strength of PU foams
Improved adhesion of PU coatings, sealants, adhesives
Better flow and leveling
Low application rate, 1-5 pph polyol
Low cross-link density of polyurethane elastomers
Tearing and compressive failure of polyurethane foams
Poor load bearing strength of PU foams
Curative for polyurethane, Polyurethane foams, Coatings, Sealants, Adhesives
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