250µm fiber are positioned in the loose tube which is made of high module plastics and the loose tube is filled with waterproof chemical compound ,and the water-blocking materials is applied to keep the cable watertight , two parallel steel wires are placed at two sides .

　　Characteristics

　　Good mechanical performance and temperature property

　　Loose tube itself has good resistance to hydrolysis performance and high strength

　　The tube filled with special cream ,optical fiber was key protection .

　　Two parallel steel wire ensue the cable crush resistance

　　PE Jacket is good is anti-UV

　　Diameter is small ,weight is light and easy to lay

　　Greater deliver strength

　　Standard

　　Applied to YD/T 769