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

HS v2017 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 crucial component in the manufacturing of a wide range of products. Polyesters are synthetic polymers that have become indispensable in various industries, including construction, automotive, and consumer goods. This code's importance lies in its versatility and the growing demand for lightweight, durable, and cost-effective materials in the global economy.

Production process

The production of unsaturated polyesters in primary forms 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 resin is then extruded or molded into various shapes and forms, such as sheets, fibers, or pellets, depending on the intended application.

Production inputs

The main inputs required for the production of HS code 390791 polyesters include dicarboxylic acids (such as maleic acid or phthalic acid), dihydric alcohols (such as ethylene glycol or propylene glycol), and various additives and catalysts. Additionally, specialized machinery and equipment, such as reactors, extruders, and molding machines, are essential for the manufacturing process.

Production outputs

The primary outputs of HS code 390791 are unsaturated polyester resins, which are widely used in the production of 392010 Polymers of ethylene, in primary forms, 392020 Polymers of propylene or of other olefins, in primary forms, and 392030 Polymers of styrene, in primary forms. These polyester resins are then further processed and incorporated into a diverse range of products, including fiberglass-reinforced composites, coatings, adhesives, and various molded parts.

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 page shows a legacy version of code 390791 ( HS v2017).

Older versions

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

    graph LR
    A["<a href='/classifications/hs/v2017/39'>39: Plastics and articles thereof</a>"]
A --> B["<a href='/classifications/hs/v2017/3907'>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/v2017/390791'>390791: Polyesters; n.e.c. in heading no. 3907, unsaturated, in primary forms</a>"]

    B --> D["<a href='/classifications/hs/v2017/390710'>390710: Polyacetals; in primary forms</a>"]
B --> E["<a href='/classifications/hs/v2017/390720'>390720: Polyethers; in primary forms, excluding polyacetals</a>"]
B --> F["<a href='/classifications/hs/v2017/390730'>390730: Epoxide resins; in primary forms</a>"]
B --> G["<a href='/classifications/hs/v2017/390740'>390740: Polycarbonates; in primary forms</a>"]
B --> H["<a href='/classifications/hs/v2017/390750'>390750: Alkyd resins; in primary forms</a>"]
B --> I["<a href='/classifications/hs/v2017/390761'>390761: Poly(ethylene terephthalate); in primary forms, having a viscosity of 78ml/g or higher</a>"]
B --> J["<a href='/classifications/hs/v2017/390769'>390769: Poly(ethylene terephthalate); in primary forms, having a viscosity of less than 78ml/g</a>"]
B --> K["<a href='/classifications/hs/v2017/390770'>390770: Poly(lactic acid); in primary forms</a>"]
B --> L["<a href='/classifications/hs/v2017/390799'>390799: Polyesters; n.e.c. in heading no. 3907, saturated, in primary forms</a>"]

    

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