HS Code for Silica rubber compound

Silica rubber compound is classified under HS code 4005.10. This code falls under Chapter 40, which covers rubber and articles thereof. Heading 4005 is dedicated to compounded rubber that is unvulcanised, in primary forms or in plates, sheets, or strips. Subheading 4005.10 specifically covers rubber compounded with carbon black or silica. In modern tire manufacturing and industrial rubber production, silica is frequently used as a reinforcing filler to improve rolling resistance and grip. For a product to fall under this code, the silica must be mixed into the raw rubber (natural or synthetic) before vulcanization. This classification is essential for manufacturers who trade intermediate rubber materials that are ready for molding or further processing into finished goods.

Products Included

• Unvulcanised rubber masterbatches containing silica
• Silica-filled synthetic rubber sheets
• Compounded unvulcanised natural rubber with silica filler
• Silica-reinforced rubber strips for tire treads
• Unvulcanised rubber plates containing silicon dioxide

Common Misclassification

A common error is classifying this material under HS code 4002, which covers synthetic rubber in primary forms. However, once silica or carbon black is added, the material is considered "compounded" and must move to 4005. Another misclassification occurs with HS code 4008, which covers plates and sheets of vulcanized rubber. If the rubber has already undergone the vulcanization process (heat-treated with sulfur), it can no longer be classified under 4005. Additionally, pure silica powder should be classified under 2811.22, not under the rubber chapter, even if intended for use in the rubber industry.

FAQ

What is the HS code for silica rubber compound?

The HS code for unvulcanised rubber compounded with silica is 4005.10.

Does 4005.10 include finished rubber tires?

No, finished tires are classified under heading 4011. HS code 4005.10 is only for the raw, unvulcanised compound material.