Where did it all begin?

Nonstick coatings hit the selling floors in the early 1960s.

The first nonsticks were made primarily of polytetrafluoroethylene (PTFE). PTFE has the lowest coefficient of friction (CoF) of any known solid. In other words, the majority of materials (in this case foodstuffs) do not stick to it.

PTFE's low CoF "releases" the materials, making it easy to separate them from the coating. Therefore, on nonstick pans, most substances are easily removed from the surface.

Unfortunately, PTFE is also very soft and, if unprotected, wears quickly. While early nonsticks had good release, they were soft and wore out after little use. The result: nonstick-coated cookware earned the reputation of being "disposable".
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Surface Preparation

Zinc Phosphate Pretreatment

This is a chemical conversion treatment that is performed often on carbon steel to prevent the corrosion of the material. During this process a thin layer of phosphate salts is created on the surface of the metal. This layer is chemically bonded to the steel and provides enhanced adhesion to the organic coating and enhanced corrosion resistance. The process can be carried on by spraying or by dipping, usually in a continuous process in a tunnel.

This process deposits fine crystals of zinc phosphate with minimum porosity on the substrate. These improve adhesion, flexibility and corrosion resistance. The 5 steps typically recommended here include: an alkaline clean, water rinse, deposition of zinc phosphate, a second water rinse and chromate sealer. It's important to monitor temperature, immersion time, pH and concentration of solution, and rinse water contamination to insure consistent results.

Zinc Phosphate Pretreatment Services


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