3907.40.00.00 - Polycarbonates

This HTS category, 3907.40.00.00, specifically classifies polycarbonates in their primary forms. Polycarbonates are a group of thermoplastic polymers known for their exceptional impact resistance, optical clarity, and high heat deflection temperature. They are typically supplied as pellets, granules, powders, or blocks and are the raw material for a wide range of manufactured articles, including optical media (CDs, DVDs), automotive components, electronic housings, and safety equipment.

Within Chapter 39, and specifically under heading 3907, polycarbonates are distinguished from their sibling categories by their unique chemical structure and resulting properties. For instance, polyacetals (3907.10) are characterized by their acetal linkage and high stiffness, while epoxide resins (3907.30) are thermosetting polymers known for their adhesive and coating applications. Alkyd resins (3907.50) are typically used in paints and varnishes. The defining characteristic of polycarbonates is the carbonate group (-O-(C=O)-O-) within their polymer backbone.

As this classification represents a leaf node within the HTS, there are no further subcategories. Therefore, classification at this level relies on confirming that the material is indeed a polycarbonate and is presented in a primary form as defined by Chapter 39 of the Harmonized System. This ensures that these versatile polymers are accurately accounted for in international trade.