HS Code for Heat resistant glass tubes

Heat resistant glass tubes are classified under HS code 7002.32. This code is designated for unworked glass tubes made of glass having a linear coefficient of expansion not exceeding 5 x 10^-6 per Kelvin within a temperature range of 0 to 300 degrees Celsius. This typically refers to borosilicate glass, known for its thermal shock resistance. Heading 7002 covers glass in balls, rods, or tubes, unworked. The classification is highly technical, relying on the physical and chemical properties of the glass rather than its intended end-use. If the glass has been further worked (e.g., graduated, bent, or processed into laboratory apparatus), it would move to a different heading. However, as raw tubing material with specific thermal resistance properties, 7002.32 is the correct designation. This classification is essential for manufacturers of laboratory equipment, industrial sight glasses, and lighting components who import raw glass stock.

Products Included

• Borosilicate glass tubing
• Neutral glass tubes for pharmaceutical use
• Pyrex-type glass tubes (unworked)
• Low-expansion glass tubes
• Raw glass tubes for laboratory glassware production
• High-temperature resistant glass rods/tubes

Common Misclassification

These tubes are often misclassified under 7017.20, which covers laboratory, hygienic, or pharmaceutical glassware. However, 7017 is for finished or worked glassware. If the tube is simply a length of unworked glass, it must stay in 7002. Another error is using 7002.31, which is reserved for fused quartz or other fused silica, or 7002.39 for glass with a higher expansion coefficient.

FAQ

What is the HS code for Heat resistant glass tubes?

The HS code for unworked heat resistant glass tubes with a low expansion coefficient is 7002.32.

What defines "heat resistant" for this HS code?

For classification in 7002.32, the glass must have a linear coefficient of expansion not exceeding 5 x 10^-6 per Kelvin between 0 and 300 degrees Celsius.