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Properties of Polyester/TGICs

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  • Properties of Polyester/TGICs

    Typical Film Thickness ~ 1.5 to 10 mils
    Coverage ~ 107 to 160 sq ft per mil of coating
    Typical Bake Schedules ~ 15 min. at 325F Low Temp, 15 min. at 375F Normal
    Impact Range ~ 40 to 160 inch lbs
    Pencil Hardness ~ H to 3H
    Flexibility ~ 0.25 inch typical

    The most familiar of these are the polyester/TGIC coatings originally used as clear coats, and later as metallic base coats on wheels. These coatings show excellent durability with good impact resistance, and, when covered with a clearcoat, durability approaches five years. With improvements in resin technology and increasing smoothness, the polyester/TGIC systems are approaching the look of acrylics.In addition to excellent weatherability, other advantages of polyester/TGIC systems include excellent gloss retention, over-bake color stability, good mechanical properties at high-film build, good salt-spray resistance, and a wide range of colors, including metallic effects and textures. Some of the drawbacks are that it is difficult to formulate a low-gloss finish, and to get very smooth coatings at film builds lower than 1.5 mils. Additionally, polyester/TGIC systems offer lower solvent resistance than the polyester/urethane chemistries.

  • #2
    Properties of Polyester/Urethanes

    Film Thickness ~ 1.2 to 4.0 mils typically
    Coverage ~ 107 to 160 sq ft/lb per mil of coating
    Cure Schedules ~ 10 min. at 400F High Temp, 15 min. at 375F Normal Temp, 20 min. at 345F Low Temp
    Impact Resistance ~ 40 to 160 inch lbs
    Pencil Hardness ~ H to 4H
    Flexibility ~ 0.125 inch typical

    A powder chemistry that is not quite as smooth as acrylic but allows better flexibility and impact resistance is polyester/urethane. Powder coatings of this type offer good salt-spray resistance and gloss retention, up to 4H pencil hardness, and low-gloss matte finishes, as well as exceptional flexibility.
    The main disadvantage for urethanes is thick film limitations. This is due to the volatilization of the blocking agent during cure.

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    • #3
      Properties of Hybrids

      Film Thickness ~ 1.5 to 20 mils typically
      Coverage ~ 107 to 160 sq ft/lb per mil of coating
      Cure Schedules ~ 10 min. at 400F High Temp, 15 min. at 375F Normal Temp, 20 min. at 325F Low Temp
      Impact Resistance ~ 50 to 160 inch lbs
      Pencil Hardness ~ H to 2H
      Flexibility ~ 0.125 inch typical

      The hybrid system is a proven chemistry for primers. Offering certain advantages of epoxy systems combined with polyester systems, these powders will offer good intercoat adhesion and chip resistance. Hybrids also offer good mechanical properties combined with good salt-spray resistance. Some of the disadvantages of hybrids are marginal UV resistance and softer films than epoxies.

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      • #4
        Re: Properties of Polyester/TGICs

        Now by golly I have to remember this don't I Thanks a lot Come on you dag printer print you said you were printing so just do it! i will chunk you at the WALLLLLL That did it it knew I was getting

        Good info

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