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    UNILINK 4200

    Dorf Ketal's Unilink® catalysts and aromatic chain extenders serve the global polyurethane and polyurea markets. Unilink can be used as effective curing agents for TDI and MDI formulations.

Polymers or foam cured with Unilink® show improved strength, hardness, adhesion, longer potlife, impact resistance and load bearing properties. It has a unique Di-funtional aromtic diamine that builds linear polymer networks. Some Unilink grades can also be used as mercury replacement catalysts.


Polyurea Systems

Unilink® 4200 improves gel time, flow and allows the polyurea coatings to be processed by spray or pour techniques. Adhesion to the substrate and surface finishes improve, and so does bonding between coats. Cured systems have excellent physical properties and exhibit significant improvements in impact resistance and low-temperature performance.

Flexible Foams

Unilink® 4200 improves tensile, tear and load-bearing properties In standard TDI and high-resilience slabstock foam systems, often at lower foam densities, and significantly improves polyester foam tear strength and load-bearing. It reduces density and softens cold-molded foams, producing higher tensile strength, tear and elongation, along with improved mold flow and decreased de-mold times.

Rigid Foams

Rigid foams cured with Unilink® 4200 show significant improvements in compressive strength and dimensional stability with reduced friability, a higher percentage of closed cells and lower K-factor. Compressive strength improves by up to 100% in PIR foams, and dimensional stability also is significantly enhanced.

Coatings, Adhesives, Sealants & Elastomers

Formulations cured with Unilink® 4200 adhere better and develop smoother surface finishes.

    Appearance clear Light-to-dark brown liquid
    Hydroxyl number 362
    Flash point, PMCC, °C (°F), min 161 (321.8)
    Specific gravity @ 26.7 °C (80 °F) 0.98 to 0.99
    Density, g/cm³ (lb/gal) 0.995 (8.3)
    Water content, ppm, max 500
    Molecular weight 310
    Equivalent weight, min 153
    Primary chemistry Di-functional Diamine


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