When the film is lifted from the container, it is continually replaced forming a rope of Nylon. Nylon is a synthetic polymer.
Nylons are polyamides made form the reactions of diacids and diamines.
Wear safety goggles and gloves and work in a hood when preparing the chemicals. When finished with the demo, cover the beaker and set aside. Hexanes are very volatile. Do not use near flame or expose to heat such as from an overhead projector. They may be irritating to the respiratory tract and, in high concentrations, narcotic.