Kynar ® 500 PVDF

Citation

(1999), "Kynar ® 500 PVDF", Pigment & Resin Technology, Vol. 28 No. 4. https://doi.org/10.1108/prt.1999.12928dad.003

Kynar ® 500 PVDF

Kynar ® 500 PVDF

Keywords: Elf Atochem, Polymers, Resins

Kynar ® 500 is an exclusive polymer from Elf Atochem produced from polyvinylidene fluoride (PVDF) resins. These resins consist of 59 per cent fluorine, 38 per cent carbon and 3 per cent hydrogen by weight. The carbon-fluorine bond is reported to produce one of the strongest known chemical bonds, and is responsible for the outstanding stability of Kynar ® 500, which is reflected in the following main properties:

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  chemical stability;

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  mechanical strength;

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  UV-stability;

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  fire-resistance;

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  stain-resistance.

Fluorinated polymers also boast a remarkable characteristic in that all these properties remain stable over time.

Kynar ® 500 was developed to achieve an ideal balance of the properties required from a base resin for liquid coatings on metal substrates. It may be blended to modifying resins (normally of the acrylic kind) and to inorganic pigments to produce coating systems with reportedly outstanding resistance to decay induced by UV-rays, erosion, grime and mould, and which display no chalking and retain their initial gloss and colour over a long period of time.

Paint formulators must comply with a Kynar ® 500 content of 70 per cent minimum of the overall weight of resins to achieve the coating's optimum performance. Kynar 500-based paints are factory applied by pre- or post-lacquering, on steel or aluminium supports, before being oven-cured. The resulting coatings are said to be sufficiently flexible to accommodate subsequent shaping: the coated steel or aluminium can be sheared, stamped into shape, profiled or bent, without any risk of parting or alteration to the surface finish.