HS Code for High-hardness ceramics

High-hardness ceramics are classified under HS code 6909.12. This code is part of Chapter 69, which covers ceramic products, and specifically heading 6909, which pertains to ceramic wares for laboratory, chemical, or other technical uses. The subheading 6909.12 is distinguished by a specific physical property: the material must have a hardness equivalent to 9 or more on the Mohs scale. This includes advanced technical ceramics such as high-purity alumina (aluminum oxide), silicon carbide, and certain boron compounds. These materials are valued for their extreme wear resistance, thermal stability, and chemical inertness in harsh environments. To qualify for this code, the article must be intended for technical applications—such as pump components, mechanical seals, or laboratory crucibles—rather than decorative or general household use. The classification relies on the Mohs hardness test, where a value of 9 corresponds to the hardness of corundum. If a ceramic article has a hardness lower than 9, it falls under different subheadings like 6909.11 (for porcelain or china) or 6909.19 (for other materials). The distinction is vital because technical ceramics often benefit from different trade agreements or are subject to dual-use export controls due to their applications in aerospace, defense, and semiconductor manufacturing. Importers must provide technical data sheets specifying the material composition and the measured hardness to justify the use of 6909.12.

Products Included

• Alumina ceramic components (99% purity)
• Silicon carbide technical seals
• Boron carbide wear plates
• Laboratory crucibles with Mohs hardness of 9+

Common Misclassification

This code is often confused with 6909.11, which is specifically for porcelain or china technical wares. It is also confused with 6909.19, which covers technical ceramics with a Mohs hardness of less than 9, such as zirconia or certain steatite ceramics. Additionally, finished machinery parts made of ceramic might be classified in Chapter 84 or 85 depending on their function.

FAQ

What is the HS code for high-hardness ceramics?

The correct HS code is 6909.12, provided the ceramic is for technical use and has a Mohs hardness of 9 or higher.

Can decorative ceramic items be classified here?

No, heading 6909 is strictly for laboratory, chemical, or technical uses. Decorative items are classified under 6913 or 6914.