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Synthetic fiber (synthetics) is a kind of chemical fiber, which is a general term for chemical fibers made from synthetic polymer compounds. It uses small molecular organic compounds as raw materials, and is a linear organic polymer compound synthesized by polyaddition reaction or polycondensation reaction, such as polyacrylonitrile, polyester, polyamide, etc. It can be seen from the classification of fibers that it belongs to a category of chemical fibers.

Air freight price calculation method:

（1） Air freight charge weight

According to the provisions of the airline、 when the cargo is small and heavy、 it shall be calculated according to the actual weight; In case of large volume and small weight of goods、 it shall be calculated by volume. A batch of goods consists of several different goods、 including light goods and heavy goods. The billing weight shall be the total gross weight or total volume weight of the whole batch of goods、 whichever is higher.

（2） Air freight price calculation and cost category

1. Rates;

2. TRANSPORTATIONCHARGES;

3. The airlines charge the international air freight according to the three regional rates set by the International Air Transport Association;

4. There are four main types of air freight: (1) general freight; (2) Freight rate of special goods or designated goods; (3) Class freight rate of goods; (4) Freight rate of container cargo

（3） Minimum freight

The minimum freight that the airline can accept for handling a batch of goods、 regardless of the weight or volume of the goods、 and the minimum amount that should be charged for transporting a batch of goods between two points. Different regions have different minimum freight rates.

（4） Other provisions on air freight price calculation

All the different air freight rates and charges have the following common points: the freight rate refers to the transfer from one airport to another. It is only applicable to a single direction; Other additional costs are not included. Such as picking up、 customs declaration、 delivery and warehousing expenses. Freight rates are usually published in local currency. Freight rates are generally calculated in kilograms or pounds. The freight rate in the air waybill is based on the applicable freight rate on the date when the air waybill is issued.

According to the form and packaging of goods、 the maritime transport goods are divided into three categories: liquid goods、 dry bulk goods and general cargo. The three categories of goods are divided as follows:

① Liquid cargo: petroleum、 product oil、 liquefied gas、 liquid chemicals and other liquid cargo.

② Dry bulk cargo: various primary products and raw materials. Generally、 dry bulk cargo can be divided into bulk cargo and small bulk cargo according to the size of transportation batch. Bulk cargo mainly includes coal、 metal ore、 grain、 etc; Small batch bulk cargo includes steel、 wood、 fertilizer、 cement、 etc.

③ General cargo: mainly including electromechanical equipment、 chemical industry、 light industry medicine and other industrial finished products、 agricultural、 animal husbandry and fishery products. These goods are generally consigned in the form of "pieces"、 "boxes" and "bundles"、 including packaged goods、 unpacked goods or non packaged goods、 and unitized goods.

The international express line is a dedicated logistics transportation service independently developed by domestic express and logistics companies from domestic export to the target country、 or from the target country to domestic import. International express lines have the advantages of fast time、 low price and smooth customs clearance.