Designs on the wall-thickness of high-polymer round loose-tube to be used as the secondary coating of fibers (or fiber-bundles ) are discussed in this paper. The relations between the wall-thickness and two typical forces applied to the tube (laterally and circumferentially
tube deformation ratio
tube outdiameter
elastic modulus of tube material are analyzed in details. Meanwhile
the quantified curves are given for the different high-polymer naterials suitable for loose tube (HDPE