HS Code for Compounded unvulcanized rubber

HS code 400510 is designated for unvulcanized rubber that has been compounded with specific reinforcing agents, namely carbon black or silica. This classification falls under Chapter 40, which covers rubber and articles thereof. Heading 4005 specifically addresses compounded rubber, unvulcanized, in primary forms or in plates, sheets, or strip. The inclusion of carbon black or silica is a significant industrial distinction, as these additives are used to enhance the physical properties of the rubber, such as tensile strength and abrasion resistance, before the vulcanization process occurs. To be classified here, the rubber must be in a "primary form" (such as blocks, lumps, or powders) or in basic geometric shapes like sheets. This code excludes natural rubber that has not been compounded and synthetic rubber in its raw state. The precise chemical composition and the presence of the specified fillers are the primary drivers for classification under this subheading. This material is typically an intermediate product used in the manufacture of tires, seals, and other industrial rubber goods.

Products Included

• Masterbatches of rubber with carbon black
• Unvulcanized rubber sheets containing silica
• Compounded rubber in granules or powder
• Unvulcanized rubber plates for industrial molding
• Compounded latex in primary forms

Common Misclassification

This code is often confused with HS code 4001 (natural rubber) or 4002 (synthetic rubber). Those codes are for raw rubber that has not yet been compounded with fillers. Another common error is using HS code 400591, which is for compounded unvulcanized rubber that does not contain carbon black or silica. If the rubber has been vulcanized, it must be classified under headings 4007 through 4017.

FAQ

What is the HS code for Compounded unvulcanized rubber?

The HS code for unvulcanized rubber compounded with carbon black or silica is 400510.

What if the rubber is already vulcanized?

If the rubber has undergone vulcanization, it is no longer classified under 4005 and must be moved to headings such as 4008 (plates/sheets) or 4016 (other articles).