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 v2017 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 commercial applications. This glass tubing is characterized by its low thermal expansion coefficient, making it suitable for use in specialized equipment and devices where thermal stability is crucial. The production and trade of this glass tubing is an important part of the broader glass manufacturing industry, which is a key sector within the global economy.

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, soda ash, 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 relieves internal stresses and ensures the glass maintains its low thermal expansion properties.

Production inputs

The main inputs required for the production of glass tubing under HS code 700239 include high-purity silica sand, soda ash, and other mineral additives such as alumina and calcium oxide. Specialized furnaces and drawing equipment are also essential for the manufacturing process. Additionally, the production of this glass tubing may require skilled labor and advanced quality control measures to ensure the final product meets the stringent requirements for thermal stability.

Production outputs

Glass tubing produced under HS code 700239 is primarily used in a variety of industrial and scientific applications, such as 901890 Instruments and appliances used in medical, surgical, dental or veterinary sciences, not elsewhere specified or included, 902780 Instruments and apparatus for physical or chemical analysis, and 902830 Instruments and apparatus for measuring or checking electricity. The low thermal expansion properties of this glass tubing make it a crucial component in many precision instruments and devices where temperature stability is of utmost importance.

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 page shows a legacy version of code 700239 ( HS v2017).

Older versions

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/v2017/70'>70: Glass and glassware</a>"]
A --> B["<a href='/classifications/hs/v2017/7002'>7002: Glass in balls (other than microspheres of heading no. 7018), rods or tubes, unworked</a>"]
B --> C["<a href='/classifications/hs/v2017/700239'>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/v2017/700210'>700210: Glass; unworked, in balls (other than microspheres of heading no. 7018)</a>"]
B --> E["<a href='/classifications/hs/v2017/700220'>700220: Glass; unworked, in rods</a>"]
B --> F["<a href='/classifications/hs/v2017/700231'>700231: Glass; unworked, in tubes, of fused quartz or other fused silica</a>"]
B --> G["<a href='/classifications/hs/v2017/700232'>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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