High Purity P4S3 for Organic Synthesis
High purity phosphorus trisulfide (P4S3) at 99% purity, supplied as crystals, is used as a thionating agent to convert carbonyls to thiocarbonyls in pharmaceutical intermediate synthesis. It is classified under tariff item 2813.90.00 as an 'other' sulfide of a non-metal, being commercial phosphorus trisulfide.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the product is an organo-sulfur compound
Organo-sulfur compounds are classified in Chapter 29, not Chapter 28, unless they are simple sulfides of non-metals.
If the product is carbon disulfide
Carbon disulfide is a distinct non-metal sulfide under heading 28.13.
If the product is a mixture or not chemically defined
Products not meeting the criteria for Chapter 28 may fall under heading 38.24.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Provide a certificate of analysis confirming the 99% purity to support the classification
• Ensure the product is not put up in measured doses or for retail sale, which could trigger other headings
• Confirm the end-use as a thionating agent to justify the high-purity grade
Related Products under Tariff item 2813.90.00
Arsenic Disulfide Crystals
High-purity arsenic disulfide (As2S2) crystals grown for research in photoconductive materials and phase-change memory devices. This chemically defined sulfide of arsenic falls under tariff item 2813.90.00 as an 'other' sulfide of non-metals, meeting the criteria of Chapter 28 Note 1(a) for separate chemically defined compounds.
Arsenic Pentasulfide Flakes
Arsenic pentasulfide (As2S5) in flake form, a reactive arsenic sulfide used in organic synthesis and depilatory agents. As a chemically defined sulfide of arsenic, it is classified under tariff item 2813.90.00 as an 'other' sulfide of non-metals, consistent with Chapter 28 Note 1(a).
Arsenic Sulfide Glass Chunks
Chunks of arsenic sulfide-based glass (As2S3) used for molding into infrared lenses and windows. While chemically defined as arsenic trisulfide, the physical form as glass chunks may be considered a manufactured article rather than a basic chemical, but as a sulfide of a non-metal it falls under tariff item 2813.90.00.
Arsenic Trisulfide Powder
Arsenic trisulfide (As2S3) is a chemically defined sulfide of arsenic, appearing as a yellow-orange powder used in the production of semiconductors and infrared optical materials. It falls under tariff item 2813.90.00 as an 'other' sulfide of non-metals, meeting Chapter 28 Note 1(a) criteria.
Commercial Grade Phosphorus Sulfide 1314-85-2
Bulk commercial phosphorus trisulfide (CAS 1314-85-2) in 25kg drums for chemical manufacturing, distinguished by commercial impurities from analytical grades. Tariff item 2813.90.00 covers this as 'other' commercial phosphorus trisulfide.
Commercial Phosphorus Trisulfide
Commercial phosphorus trisulfide (P4S3) is a yellow-gray crystalline powder used primarily in the manufacture of safety match heads and as a lubricant additive. It falls under tariff item 2813.90.00 as a sulfide of phosphorus, specifically commercial phosphorus trisulphide.