Glass; unworked, in tubes, other than of glass having a linear coefficient of expansion not exceeding 5 x 10 (to the minus 6, (or 0.000005) ) per Kelvin within a temperature range of 0-300 degrees C, not fused quartz or other fused silica

HS v2022 Code: 700239

About glass; unworked, in tubes, other than of glass having a linear coefficient of expansion not exceeding 5 x 10 (to the minus 6, (or 0.000005) ) per kelvin within a temperature range of 0-300 degrees c, not fused quartz or other fused silica

HS code 700239 covers a specific type of unworked glass tubing that is used in a variety of industrial and scientific applications. This glass tubing is characterized by its low thermal expansion coefficient, making it highly resistant to thermal shock and well-suited for specialized equipment and devices. The global glass tubing industry plays a crucial role in supporting various manufacturing sectors, from electronics to medical devices, contributing to technological advancements and economic growth.

Production process

The production of glass tubing under HS code 700239 typically involves a multi-step process. First, the raw materials, such as silica sand, limestone, and other mineral additives, are carefully measured and mixed to achieve the desired chemical composition. The mixture is then melted in a high-temperature furnace, and the molten glass is drawn into long, continuous tubes. These tubes are then carefully annealed, a process that involves controlled cooling to relieve internal stresses and ensure the tubing's structural integrity. Finally, the tubing is inspected, cut to the desired lengths, and packaged for distribution.

Production inputs

The primary inputs required for the production of glass tubing under HS code 700239 include high-purity silica sand, limestone, and other mineral additives that contribute to the specific thermal and chemical properties of the glass. Additionally, the manufacturing process requires specialized equipment, such as glass-melting furnaces, drawing machines, and annealing ovens. Skilled labor, including glass technicians and engineers, is also a crucial input for ensuring the quality and consistency of the final product.

Production outputs

Glass tubing classified under HS code 700239 is used in a wide range of applications, including 901890 medical, surgical or laboratory glassware, 854420 insulated electric conductors, and 902780 other instruments and appliances for physical or chemical analysis. The unique thermal properties of this glass tubing make it particularly valuable for use in specialized equipment and devices that require high resistance to thermal shock and stability across a wide temperature range.

Revisions to 700239

Classification codes are adjusted frequently. The code may have been revised or replaced between system versions. The table below shows the history (newest to oldest) of the code 700239. The most recent 1 version of this code (700239) is in the HS v2022 system (this version):

This page shows the most recent version of code 700239.

Family tree for glass; unworked, in tubes, other than of glass having a linear coefficient of expansion not exceeding 5 x 10 (to the minus 6, (or 0.000005) ) per kelvin within a temperature range of 0-300 degrees c, not fused quartz or other fused silica

    graph LR
    A["<a href='/classifications/hs/v2022/70'>70: Glass and glassware</a>"]
A --> B["<a href='/classifications/hs/v2022/7002'>7002: Glass in balls (other than microspheres of heading no. 7018), rods or tubes, unworked</a>"]
B --> C["<a href='/classifications/hs/v2022/700239'>700239: Glass; unworked, in tubes, other than of glass having a linear coefficient of expansion not exceeding 5 x 10 (to the minus 6, (or 0.000005) ) per Kelvin within a temperature range of 0-300 degrees C, not fused quartz or other fused silica</a>"]

    B --> D["<a href='/classifications/hs/v2022/700210'>700210: Glass; unworked, in balls (other than microspheres of heading no. 7018)</a>"]
B --> E["<a href='/classifications/hs/v2022/700220'>700220: Glass; unworked, in rods</a>"]
B --> F["<a href='/classifications/hs/v2022/700231'>700231: Glass; unworked, in tubes, of fused quartz or other fused silica</a>"]
B --> G["<a href='/classifications/hs/v2022/700232'>700232: Glass; unworked, tubes, of glass having a linear coefficient of expansion not exceeding 5 x 10 (to the minus 6), (or 0.000005) per Kelvin within a temperature range of 0-300 degrees C</a>"]

    

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