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Bel-Art Scienceware Super-Polyfoil™ Autoclaving Wrap Foil Sheets are ideal for covering flasks and lab containers piror to autoclaving, incubating or storing cell culture solutions and reagent chemical solutions. Polyester-backed foil sheets are the ideal alternative to plain aluminum foil which oxidizes and kinks easily. A unique polyester layer is adhered to the aluminum foil sheet which provides, providing sterile protection and a chemical-resistant barrier. The film backing also prevents pinholes and is resistant to most solvents and caustic reagent chemicals. Foil sheets fold easily and flatten neatly without. Materials are compliant with FDA regulations concerned with direct food contact.