What is the difference between Kynar and
standard PVDF coatings?
Architectural top finishes are applied to the exposed surface of coated fabrics to provide further protection of the membrane from environmental conditions. Finishes are typically formulated with various polymer systems such as acrylic, acrylic blends and fluoropolymers. These systems are susceptible to degradation depending on their molecular structure. Fluoropolymers have been the choice resin to use in high-performance coating applications for over 50 years. There are a variety of fluoropolymers to choose from and they can be used in finishes at varying concentrations.
Seaman Corporation offers Shelter-Rite Brite with Kynar as the superior architectural fabric in the market. Kynar is a proprietary licensed formulation, containing at least 70%, by weight of the total resin, polyvinylidene fluoride (PVDF). Weldable PVDF coatings offered in the architectural market contain approximately 20% PVDF to 80% Acrylic resin. Studies have shown that the higher the percent of acrylic resin, the performance properties drop dramatically. The acrylic's molecular structure contains esters and functional groups that are highly susceptible to photochemical degradation and hydrolysis. Higher PVDF content is key because the polymer is inert (stable, minimal polymer degradation); the carbon fluorine bond is the strongest chemical bond providing for superior performance properties, twice the fluorine content imparting excellent resistance to thermal, chemical and UV degradation. Kynar has been in the architectural marketplace for over 45 years and has a proven track record for performance over time.
In architectural structure applications where the high-quality performance of Kynar is not warranted, weldable PVDF (TS236) would provide for a premium durable barrier. This finish would offer some resistance to thermal, chemical and UV degradation, but it would be significantly reduced compared to Kynar. Acrylic and acrylic blends (TS103, TS139) are a good alternative. They impart resistance to soiling, reduce modifier migration and help to protect the integrity of the structure. Our competent sales staff can assist you in choosing the top finish that would be best suited for your architectural structure needs.
