HS Code for Fused silica tubes

Fused silica tubes are classified under HS code 7002.31, which pertains to glass in tubes that is unworked and specifically made of fused quartz or other fused silica. The classification logic follows the material composition and the state of manufacture. Chapter 70 covers glass and glassware, and heading 7002 is dedicated to glass in balls, rods, or tubes, provided they have not been worked beyond simple cutting or surface treatment. The subheading 7002.31 is distinguished by the high silica content (typically over 99% SiO2), which gives the glass its unique thermal and optical properties, such as a low coefficient of thermal expansion and high UV transparency. If the tubes were further processed into specific laboratory instruments, they would move to heading 7017. However, in their primary, unworked tubular form, they remain in 7002. This classification is consistent with GRI 1 and 6, focusing on the literal description of the goods and their chemical purity. The distinction between fused silica and other types of glass (like borosilicate) is critical for determining the correct subheading.

Products Included

• Unworked fused quartz tubing
• Transparent fused silica tubes
• Opaque or translucent silica tubes
• High-purity quartz glass cylinders
• Fused silica capillary tubes (unworked)

Common Misclassification

Fused silica tubes are often misclassified under 7017.10, which covers laboratory, hygienic, or pharmaceutical glassware. The distinction lies in whether the tube is \"unworked.\" If the tube has been graduated, calibrated, or fitted with joints, it belongs in 7017. Another common error is 7002.32, which is for glass with a different coefficient of expansion (like borosilicate). Finally, if the silica is in fiber form, it must be classified under 7019 rather than 7002.

FAQ

What is the HS code for fused silica tubes?

The correct HS code for unworked fused silica tubes is 7002.31.

What defines a tube as \"unworked\" for HS code 7002?

An unworked tube is one that has not been subjected to any process after manufacture other than simple cutting to length or smoothing of the ends, and has not been shaped into a specific tool or apparatus.