Flame-retardant resin composition, and insulating wire, metal cable, optical fiber cable and molded article using the same

A flame-retardant resin composition, comprising:

• a base resin composed of polyethylene and an acid-modified polyolefin;
• a silicone compound;
• a fatty acid-containing compound;
• and
• a hindered amine-based compound including a hindered amine structure;
• wherein the polyethylene includes a high-density polyethylene, a medium-density polyethylene and a low-density polyethylene,
• wherein the high-density polyethylene has a density of 945 kg/m3 or more,
• the medium-density polyethylene has a density of 914 kg/m3 or more and less than 945 kg/m3, and
• the low-density polyethylene has a density of 864 kg/m3 or more and less than 914 kg/m3,
• wherein the base resin contains the high-density polyethylene in an amount of 40 mass % or more and 60 mass % or less,
• the base resin contains the medium-density polyethylene in an amount of 1 mass % or more and 35 mass % or less,
• the base resin contains the low-density polyethylene in an amount of 10 mass % or more and 30 mass % or less, and
• the base resin contains the acid-modified polyethylene in an amount of 1 mass % or more and 20 mass % or less,
• wherein the silicone compound is blended in an amount of 3 parts by mass or more and 10 parts by mass or less relative to 100 parts by mass of the base resin,
• the fatty acid-containing compound is blended in an amount of 3 parts by mass or more and 10 parts by mass or less relative to 100 parts by mass of the base resin,
• the hindered amine-based compound is blended in an amount of 0.2 part by mass or more and 2.4 parts by mass or less relative to 100 parts by mass of the base resin, and
• wherein the hindered amine-based compound is composed of a first hindered amine-based compound and a second hindered amine-based compound different from the first hindered amine-based compound.