optical cable fiberglass yarn is a flexible inorganic material with extremely low dielectric properties and high winter resistance. It can replace alkali free glass fiber, high silica oxygen, basalt fiber, etc., and partially replace aramid fiber and carbon fiber, etc. It has unique advantages in the field of ultra-high temperature and aerospace. In addition, the linear expansion coefficient of optical cable fiberglass yarn is small, and the elastic modulus increases with the increase of temperature. And the number of strands are wound around the winding drum.