Glass microspheres; not exceeding 1mm in diameter

HS code 701820 covers the classification of glass microspheres, which are tiny, spherical glass particles typically less than 1 millimeter in diameter. These microscopic glass beads have a wide range of industrial and commercial applications, making them an important commodity in the global trade of specialty glass products. The production and export of glass microspheres is a significant component of the broader glass manufacturing industry, which plays a crucial role in various sectors of the economy.

Glass microspheres are primarily produced through a process called flame attenuation. In this method, molten glass is forced through small orifices and then exposed to a high-velocity air stream, which causes the glass to form into tiny, uniform spheres. The glass microspheres are then cooled and sorted by size to meet specific product requirements. Advanced techniques, such as the use of specialized equipment and precise temperature and pressure controls, help ensure the consistent quality and performance of the final glass microsphere products.

The production of glass microspheres requires several key inputs, including high-quality raw materials such as silica sand, soda ash, and other mineral additives. Specialized manufacturing equipment, such as glass melting furnaces, orifice plates, and air atomization systems, are also essential for the flame attenuation process. Additionally, the industry relies on a skilled workforce capable of operating and maintaining the specialized equipment used in the production of these microscopic glass beads.

Glass microspheres produced under HS code 701820 find applications in a wide range of industries, including 701931 Microspheres and hollow glass spheres, 901380 Optical devices, appliances and instruments, and 842139 Filtering or purifying machinery and apparatus. These versatile glass particles are used in various products, such as reflective paints, abrasives, fillers, and specialized coatings. The output of this industry is an important input for many other manufacturing sectors, contributing to the overall economic value chain.