What kind of flame retardant system is suitable for the extrusion of flame - retardant corrugated pipes?

Corrugated pipe is a kind of plastic pipe used to protect wires and cables. It has various functions. For example, it can prevent wires and cables from being scratched by external objects, and it has the advantages of abrasion resistance, acid resistance, good flexibility, and so on. There are several types of corrugated pipes, including flame-retardant corrugated pipes and split corrugated pipes. Let's have an in-depth understanding of the flame-retardant corrugated pipes. 

At present, the main types of flame retardants used for corrugated pipes are as follows: One type is the bromine-antimony system. Antimony trioxide is commonly used in combination with bromine-based flame retardants. Antimony chloride can isolate the air for a long time to achieve the flame-retardant effect. Another type is the phosphorus-nitrogen system. It decomposes when overheated and releases phosphoric acid and non-combustible gases. The latter can isolate oxygen around the flame. There is also a composite system, which is between the above two systems. 

All these three types can be used in the extrusion of flame-retardant corrugated pipes, but the composite system is relatively better.