Impulse Sealing APPLICATIONS Master Seal Impulse hand sealers make excellent air and water tight seals on Polyethylene, Pliofilm, P.V.A., Polyurethane Kel-F, Tivac, Polyvinylchloride, Saran Polypropylene, Mylar, Nylon, Polyflex, and all other heat sealable materials. Contact Us Enquire Now