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American Porcelain Enamel Company
A subsidiary of Cherokee Porcelain Enamel Corp.
2717 Independence Lane
Knoxville, TN 37914
Phone 865-637-7833   FAX 865-637-0019

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About Porcelain Enamel

  • What is porcelain enamel?
    Porcelain enamel on steel is a glass-like, non-porous material made up of silica, borax, soda, and various metal oxides that are fused to steel sheets.

  • How is it affected by the elements?
    Porcelain enamel on steel used for exterior surfaces is unaffected by sun, rain, snow, dust, or industrial atmospheres. The hard impervious surface defied the worst of weather conditions and will last the life of the building.

  • What is the durability of color?
    The color is permanent and will not oxidize, fade, peel, or blister. Shades of red, orange, and yellow, usually the most fugitive in the color spectrum, are unaffected by the sun.

  • What are the size limitations?
    American Porcelain's porcelain enamel on steel products are generally produced in lengths of up to ten feet and widths of up to four and one-half feet (twenty square feet recommended) with edge flanges for stiffness and concealed fasteners.

  • What are the maintainance requirements?
    Porcelain enamel on steel is maintenance-free and does not need refinishing or repainting.

  • What warranty is offered?
    American Porcelain products are manufactured in compliance with the Porcelain Enamel Institute's standard specifications (see specs/info). All manufacturer warranties are negotiated on a job-to-job basis to meet specific project requirements.


Mechanical & Physical Properties (PEI Bulletin #502)

Surface Hardness 3.5 to 6 (Moh's Scale) ------
Abrasion Resistance Excellent C448
Compressive Strength 20,000+ psi ------
Modulus of Elasticity 10 x 166 ------
Ultimate Strength(steel) 50,000 psi A424-62T
Yield Strength(of steel) 35,000 psi A424-62T
Thermal Expansion 8-14 x 106 cm/cm/-C C359

Chemical Properties (PEI Bulletin #503)

Salt Spray Excellent B117-571
Organic Solvents Superior ------
Acids Class A C282/C283
Alkali Max.pH of 12 C614
@ 212-F(100-C) psi
Water 190-(88-C) ------
Continuous service
Oil Not affected ------
Soil Corrosion Not affected ------

Appearance Properties * (PEI Bulletin #501)

Color permanence
    Gloss retention
        Cleanability
Superior weatherability as evidenced by extensive testing by the National Bureau of Standards (NBS) and the Porcelain Enamel Institute (PEI) at a variety of sites over a period of 30 or more years
* Class A acid resistance porcelain enamel

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