Parafilm Sealing Film. Colourless, moisture-proof film moulds to surface. Parafilm M is a semi-transparent, flexible, thermoplastic film with two-way stretch. Non-toxic and free from plasticizers, primarily composed of polyolefins and paraffin waxes offering good resistance against acids, alkalis and some organic solvents - use not recommended with acetone, diethyl ether or tetrachloride. Will stretch abd adhere to irregular shapes and surfaces to provide a secure seal. Disposable.