| 摘要 |
PURPOSE:To obtain a flame retardant foam cable having as low electrostatic capacity as possible so as to come up to the UL standard VW-1 by making a foaming layer of a foaming composition having a foaming degree of 50% or more. CONSTITUTION:The foaming degree of an insulative foaming layer 2 is 50% or more, preferable 60-70%. A foaming composition consists mainly of resin such as low density polyethylene and ethylene-vinyl acetate copolymer. An organic chemical foaming agent is used as a foaming agent. The foaming layer 2 therefore can come up to the UL standard VW-1 of a flame retardant test, and a sufficient flame retardance can be obtained even if the foaming layer 2 is thin, and a sheath 3 can be formed thick. Moreover, the formation of the thin insulative foaming layer 2 keeps the electrostatic capacity of a foaming cable at a low level. |
