Selected properties of extruded cellular polyethylene
Extrusion of cellular polymers and properties of cellular extrudates have been reviewed. Bulk and apparent density, tensile strength, relative elongation at yield point, impact strength, linear thermal expansivity, average aberration of the roughness profile, and average roughness interval of the outer surface of samples were determined. Pipes extruded from cellular medium-density polyethylene (942 kg/m3) were examined, cooled in various ways past the extruder head. The contents of porofor (0–1.5%), nucleant (0–0.3%) and lubricant (0–0.75%) were varied in the polyethylene to be extruded. Results are presented in Figs. 1–10 and Tables 3 and 4. Optotelecommunication applications of the cellular PE pipes as protective pipes are discussed. The work is in progress.
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