Bemis Company Parafilm M

Flexible, thermoplastic, rolled, waterproof sheet interwound with paper to prevent adhering

Supplied in 0.127mm (0.005in) thickness. Adheres quickly and firmly to itself, covering culture tube or flask mouths and sealing petri dish edges. Excellent resistance to air, other gases, alcohol, common acids, and moderately concentrated alkalies. At 21°C (70°F), it stretches 200% and returns partially to its original size. At 82 to 93°C (180 to 200°F), it softens enough to make an adhesive bond between papers, cloths, leathers, etc. Supplied in dispenser cartons.

Semi-transparent, almost colorless, odorless, and tasteless.