Cellular Polyethylene

A system of small, unconnected gas cells distributed throughout polyethylene that can be used as a dielectric material for cables. It has a permittivity inter­mediate between that of the gas and of polyethylene, ranging from 1.4 to 2.3 depending on the ratio of polyethylene to gas. The tensile strength and elongation at break is from one-third to one-half that of solid polyethylene, but is fully adequate for cable use.