Polyesters; n.e.c. in heading no. 3907, unsaturated, in primary forms

HS v2022 Code: 390791

About polyesters; n.e.c. in heading no. 3907, unsaturated, in primary forms

HS code 390791 covers unsaturated polyesters in primary forms, which are a versatile class of synthetic resins used in a wide range of applications. These materials are essential components in the production of various consumer and industrial goods, playing a crucial role in the global economy. Polyesters are valued for their durability, chemical resistance, and ability to be molded into complex shapes, making them indispensable in industries such as construction, transportation, and electronics.

Production process

The production of unsaturated polyesters typically involves a polycondensation reaction between dicarboxylic acids or their anhydrides and dihydric alcohols. This process is often catalyzed to enhance the reaction rate and control the molecular weight of the final product. The resulting polyester resins can then be further processed, such as through the addition of reinforcing fibers or the incorporation of other additives, to tailor their properties for specific applications.

Production inputs

The primary raw materials required for the production of unsaturated polyesters are dicarboxylic acids or their anhydrides, such as maleic anhydride or phthalic anhydride, and dihydric alcohols, such as ethylene glycol or propylene glycol. Additionally, various catalysts, stabilizers, and other additives may be used to optimize the polymerization process and the final product characteristics. Specialized manufacturing equipment, including reactors, extruders, and molding machines, are also essential inputs for this industry.

Production outputs

Unsaturated polyesters produced under HS code 390791 are widely used as the base material for a variety of products, including 392010 Plastic plates, sheets, film, foil and strip, of polymers of ethylene, 392020 Plastic plates, sheets, film, foil and strip, of polymers of propylene, and 392030 Plastic plates, sheets, film, foil and strip, of polymers of styrene. These polyester resins are also consumed in the production of 392110 Plastic plates, sheets, film, foil and strip, of polymers of vinyl chloride, 392190 Plastic plates, sheets, film, foil and strip, of other plastics, and various composite materials.

Revisions to 390791

Classification codes are adjusted frequently. The code may have been revised or replaced between system versions. The table below shows the history (newest to oldest) of the code 390791. The most recent 1 version of this code (390791) is in the HS v2022 system (this version):

This page shows the most recent version of code 390791.

Family tree for polyesters; n.e.c. in heading no. 3907, unsaturated, in primary forms

    graph LR
    A["<a href='/classifications/hs/v2022/39'>39: Plastics and articles thereof</a>"]
A --> B["<a href='/classifications/hs/v2022/3907'>3907: Polyacetals, other polyethers and epoxide resins, in primary forms; polycarbonates, alkyd resins, polyallyl esters and other polyesters, in primary forms</a>"]
B --> C["<a href='/classifications/hs/v2022/390791'>390791: Polyesters; n.e.c. in heading no. 3907, unsaturated, in primary forms</a>"]

    B --> D["<a href='/classifications/hs/v2022/390710'>390710: Polyacetals; in primary forms</a>"]
B --> E["<a href='/classifications/hs/v2022/390721'>390721: Polyethers other than polyacetals; in primary forms, bis(polyoxyethylene) methylphosphonate</a>"]
B --> F["<a href='/classifications/hs/v2022/390729'>390729: Polyethers other than polyacetals, and bis(polyoxyethylene) methylphosphonate; in primary forms</a>"]
B --> G["<a href='/classifications/hs/v2022/390730'>390730: Epoxide resins; in primary forms</a>"]
B --> H["<a href='/classifications/hs/v2022/390740'>390740: Polycarbonates; in primary forms</a>"]
B --> I["<a href='/classifications/hs/v2022/390750'>390750: Alkyd resins; in primary forms</a>"]
B --> J["<a href='/classifications/hs/v2022/390761'>390761: Poly(ethylene terephthalate); in primary forms, having a viscosity of 78ml/g or higher</a>"]
B --> K["<a href='/classifications/hs/v2022/390769'>390769: Poly(ethylene terephthalate); in primary forms, having a viscosity of less than 78ml/g</a>"]
B --> L["<a href='/classifications/hs/v2022/390770'>390770: Poly(lactic acid); in primary forms</a>"]
B --> M["<a href='/classifications/hs/v2022/390799'>390799: Polyesters; n.e.c. in heading no. 3907, saturated, in primary forms</a>"]

    

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