Bid pipe: The material of the beam tube is PBT. This material is hard and flexible, with anti -side pressure. Some small factories replace PBT with PP, and the cost can be reduced by half, but in transportation and construction, optical fibers are easy to break. The color of PP is translucent.

Coloring fiber: In order to distinguish each core optical fiber in communication engineering, optical cables squeeze a layer of color plastic with naked fibers. Outdoor optical cables are dyed with different colors of ink for each core. The color of the ink is the same as the indoor cable. White), red, black, yellow, purple, pink, green and green. It is allowed to replace white without affecting recognition.

Locking fiber: In order to protect the optical fiber, a layer of 250 micrometers of translucent resin is covered on the surface, and the optical fiber needs to give different colors for each core optical fiber when making an optical cable. There are 12 resins of different colors, so that the optical cable factory does not need to be color when used. The advantage of doing this is to save a color process. The disadvantage is that it cannot be flexibly matched with fiber when used.

Water blocking belt: The water blocking zone is added with water -resistant powder between two non -woven fabrics. Once the optical cable is in water, the powder quickly expands dozens of times after absorbing the water, producing gels like jelly. Pass.

Non -woven fabric: Some manufacturers will use non -woven fabrics with a lot of lower cost -resistant costs instead of water -resistant bands to reduce costs. There is no difference in appearance. Once the outer skin is broken, non -woven fabrics cannot block water.

Rolling -rolled steel belt: The main role of the bread of the water -blocking tape has rolled steel belts. The main role of the steel band on the optical cable is anti -side pressure, tensile, anti -mouse biting, and protecting the tube.

Steel wire: On the outside of the steel belt, we see two parallel steel wires. The function of the steel wire is to enhance the tension of the optical cable. The gray wire on the surface is phosphorusized. The silver wire on the surface is galvanized. The effect is to prevent rust on the wire. Galvanized steel wire is more expensive than phosphorus wire.

Optical cables: Outdoor optical cables generally use medium density polyethylene (MDPE), and some customers specify high -density polyethylene (HDPE). The cost of using high -density PE is slightly higher. There are also orders to specify low smoke and halogen -free materials (LSZH) as protective cover. Many manufacturers also use the recycling material as an optical cable sheath to reduce costs. The light cables made from this material are rough and containing a lot of impurities, which is easy to crack and seep. The source of the recycling material is to make some wire and cable skin, plastic bottles, slippers, etc. and other gallery after returning to the furnace.