the economical principle, namely in the flame retardant corrugated pipe under the condition of material performance, to reduce costs as much as possible. Are the major factors related to the cost: the price of raw materials related to the material and material utilization. Product quality related to the flame retardant corrugated pipe product performance, the use of environmental product life and maintainability, etc. Products related to the product design shape and size, part number, number of non standard parts and tolerance requirements, etc. Related to the product production cost control.

the principle of relevance. Flame retardant corrugated pipe products in all kinds of relationship between design work is not isolated. But is closely linked. Such as preparation of flame retardant corrugated pipe plastic products and corresponding process conditions of formula design and products design depends on product appearance and structure of the total; The design of the latter, in turn, can be implemented and received a large effect on the former.