The invention discloses a special anti-bonding low-
smoke halogen-free
flame-retardant sheath material for a GJFJZY type multi-core indoor optical cable. The sheath material comprises the following components in parts by weight: 5-15 parts of
ethylene-
vinyl acetate copolymer (EVA), 10-20 parts of
polyethylene (PE), 5-10 parts of
polypropylene (PP), 55-65 parts of
flame retardant, 5-10 parts of compatilizer, 2-3 parts of ultra-high molecular weight
silicone, 0.5-1.5 parts of high-melting-point
polyethylene wax and 0.3-0.8 part of
antioxidant. The PE and the PP having high melting points are used as base materials; a small amount of EVA is further used; the
flame retardant is added to achieve the flame-retardant effect; meanwhile, the ultra-high molecular weight
silicone is used as internal and external
lubricant to improve the material flowability and the
powder dispersion effect, the use amount is increased, and the ultra-high molecular weight ensures that no
precipitation exists in resin; the high-melting-point
polyethylene wax is further used as external
lubricant, and the high
melting point ensures that sufficient
lubrication action exists at high temperature and no
precipitation exists on the surface early at low temperature so as to further avoid inactivation, thus realizing that a thin
wax layer is formed between a core wire and a sheath layer in the extruding process at about 160 DEG C and serves as an isolating layer; and the core wire and the sheath layer disclosed by the invention have great difference in material, thereby finally ensuring that the both can not be bonded together. Thus, the normal use of a GJFJZY type multi-core optical cable is ensured.