The invention discloses a fireproof filling insulating layer formula for a special cable. The fireproof filling insulating layer is prepared from, by weight, 20-25 parts of sandy soil, 9-22 parts of
cordierite powder, 30-36 parts of
mullite powder, 8-20 parts of
asbestos powder, 10-30 parts of
calcium carbonate, 25-36 parts of
perlite, 20.6-30 parts of polyacid
ammonium, 20-26 parts of
pentaerythritol, 15-30 parts of antimonous
oxide micro-crosslinked resin, 40-50 parts of a
flame retardant, 16-18 parts of a
flame-retardant synergist, 17-21 parts of an
antioxidant, 16-30 parts of a
lubricant, 9.6-16.8 parts of chlorinated rubber, 22-36 parts of dioctyl
phthalate, 60-66 parts of an
antioxidant, 40-60 parts of teflon, 12.6-13.8 parts of an absorbent uv-531, 2.8-3.6 parts of toner, 16-18 parts of wintergreen oil and 10-20 parts of
silicone oil. The technological process is simple, the
raw material ratio is reasonable, and the reasonable filling
raw material is provided for cable sheath production; the
raw material has good heat insulating performance and
fireproofing performance, so that normal use of the cable is guaranteed, the service life of the cable is prolonged, the use effect is good, and the quality of the cable product is guaranteed.