Hybridur 540 Acrylic-urethane polymer Air Products North America Acrylic Resins >> Urethane Acrylic Wood & Furniture Coatings Plastic coating Metal HYBRIDUR polymer dispersions are a line of anionically stabilized acrylic-urethane hybrid polymers from Air Products. These innovative materials have been found to exhibit excellent wetting, adhesion, barrier and film properties when used in air dry, baked or crosslinked high-performance coatings on a wide variety of metal, wood, plastic and previously painted substrates. HYBRIDUR dispersions offer the formulator a cost-effective alternative to standard polyurethane dispersions (PUD) without sacrificing performance. They also offer enhanced performance properties over blends of PUDs and acrylic emulsions in coatings for primer, topcoat and clear coat applications. HYBRIDUR dispersions are easy to formulate and they offer rapid dry times. They provide the same ease of use and VOC compliance of typical waterborne dispersions with the added benefits of outstanding barrier properties, durability and UV resistance in both air dry and baked systems. HYBRIDUR 540 dispersion was designed particularly for use in environmentally friendly high-gloss wood, plastic, concrete and metal coating applications. It is especially useful in coatings requiring high solvent resistance, including isopropanol. It is a hard, sandable and buffable polymer that must be adequately coalesced to deliver maximum performance. It has good resistance to UV radiation, but will yellow slightly on extended exterior exposure. It can be blended with HYBRIDUR 570 dispersion to improve its film formation at reduced co-solvent levels. Performance can be enhanced by heating and/or by crosslinking. It possesses outstanding adhesion to a wide variety of substrates, fast dry times— <30 minutes. Touch-dry, 1 hr dry-hard, superior chemical and solvent resistance properties, resistance to a large variety of stains (particularly those required for KCMA1 and MFMA2 qualification), and mild acid and caustic resistance, good UV stability and gloss retention for topcoats, excellent compatibility with other water-based polymers if pH is maintained between 7.5 and 9.0, films with excellent mechanical properties, especially at low temperatures, good mechanical and thermal dispersion stability; can be used in high-speed pigment dispersion; passes 10 freezethaw cycles, excellent early block resistance. Acrylic-urethane hybrid polymer. Used for wood, plastic, concrete and metal coating applications. Offers fast dry time. Possesses superior chemical and solvent resistance properties. Provides good mechanical and thermal dispersion stability. Exhibits very good early block resistance.