Parafilm is a semi-transparent, flexible film composed of a proprietary blend of waxes and polyolefins. Parafilm is a registered trademark of Bemis Company, Inc, headquartered in Neenah, WI (United States). It is a ductile, malleable, non-toxic, tasteless & odorless self-sealing thermoplastic. Parafilm is a semi-transparent, flexible film composed of a proprietary blend of waxes and polyolefins. Parafilm is a registered trademark of Bemis Company, Inc, headquartered in Neenah, WI (United States). It is a ductile, malleable, non-toxic, tasteless & odorless self-sealing thermoplastic. Parafilm M is commonly used in health care, pharmaceutical and research laboratories for covering or sealing vessels such as flasks, cuvettes, test tubes, beakers, petri dishes and more. Because it melts at a low temperature, Parafilm M is not safe for use in an autoclave. Many organic solvents will dissolve Parafilm M.