Wire and cable pvc granule
Today the polymer industry is widely used in all areas of technical and engineering, including the electrical industry. There are various types of conductive polymers, semiconductors, and insulators in the electronics industry and many electronic products' prices have decreased with the use of polymers. Polyvinyl chloride or PVC has also grown well in this industry. PVC has a good flame resistance and therefore is used in electronic products, such as electrical parts and wires and cables. The relatively cheap price, good environmental and chemical resistance, has made PVC a lot of uses. Low voltage PVC cables are widely used for home appliances, household wiring, lighting, appliances and more. Also, due to high strength, good flexibility and ease of connection, PVC cables are used in the following cases:
- Power cables up to 1/1 kV (with an increase in thickness up to 14 kV)
- Control cables up to 61 threads
- Car Cables and Instrumentation
- Home cabling and Flexible cables
- Flatted cables for floating pumps
- Airport lighting and mine cables
- Fireproof cables
PVC is used to produce wire and cable granules, which is produced by a suspension method. Emulsion PVC is not suitable because of the absorption of water which is due to the presence of emulsifiers and therefore causes poor electrical parameters. Also, PVC produced by mass polymerization method has a lower ability to absorb plasticizer than the suspended method and also has higher k values. For these reasons, the use of this substance as a raw material for the wire and cable industry is not suitable.
The amount of k required for the production of wire and cable granules is about 70 and must be between 68 and 72. For coating of wire and cable, only PVC type S is used because it has a high bending strength in cold environment and has good thermal and electrical resistance. The criteria for using PVC in the wire and cable industry are:
- The structure of porous particles
- High absorption of plasticizer
- free from contaminating particles
- Has a lower percentage of volatile components
- low electrolyte content
Generally, PVC components cannot be used with a formula in different conditions (in terms of temperature, hardness, electrical resistance, etc.). Also, many polyvinyl chloride formulas differ in terms of flexibility and electrical or mechanical properties, so the price of each formula is different.