HS Code for Polysulphone

Polysulphone is classified under HS code 3911.90. This classification is found in Chapter 39, which covers plastics and articles thereof. Heading 3911 is a specific category for petroleum resins, coumarone-indene resins, polyterpenes, polysulphides, polysulphones, and other products of chemical synthesis not elsewhere specified or included, in primary forms. Polysulphones are a family of high-performance thermoplastics characterized by their high thermal, oxidative, and hydrolytic stability. The subheading 3911.90 is the "other" category within this heading, used for polysulphones and similar synthetic polymers that do not fall under the more specific subheadings like 3911.10 (petroleum resins). According to Note 6 to Chapter 39, "primary forms" refers to liquids and pastes (including dispersions and solutions) or blocks of irregular shape, lumps, powders, granules, flakes, and similar bulk forms. Therefore, polysulphone resin imported in pellet or powder form for injection molding or extrusion is correctly classified here. Once the polysulphone has been converted into a finished article, such as a specialized pipe or a laboratory component, it is classified according to the nature of the article or under the general headings for articles of plastics (3917 to 3926).

Products Included

• Polysulphone (PSU) resin in pellets
• Polyethersulphone (PES) in primary forms
• Polyphenylsulfone (PPSU) granules
• Polysulphone powder for industrial use
• Liquid polysulphone dispersions

Common Misclassification

Polysulphone is sometimes misclassified under HS code 3907.20, which covers other polyethers. While polysulphones contain ether groups, they are specifically named in heading 3911, and according to GRI 1, the specific heading takes precedence. Another common error is using 3909.31 for amino-resins or 3911.10 for petroleum resins, which are chemically distinct from the sulphone-based polymer structure.

FAQ

What is the HS code for Polysulphone?

The HS code for Polysulphone in primary forms (like granules or powder) is 3911.90.

What are considered primary forms for Polysulphone?

Primary forms include liquids, pastes, blocks, lumps, powders, granules, and flakes. If the material is shaped into a tube or sheet, it moves to headings like 3917 or 3920.