Hydraulic lime; excluding calcium oxide and hydroxide of heading no. 2825

HS code 252230 covers hydraulic lime, a type of lime that hardens and sets when mixed with water. Hydraulic lime is an important material in the construction industry, used as a binder in mortar, plaster, and concrete. It is a key component in the production of various building materials and plays a crucial role in the broader construction and infrastructure sectors.

Hydraulic lime is produced by burning limestone or other calcareous materials, such as shells or chalk, in a kiln at a specific temperature range. This process drives off carbon dioxide, leaving behind calcium oxide (quicklime). The quicklime is then slaked, or mixed with water, to form calcium hydroxide. Depending on the specific production method, various additives may be introduced to modify the properties of the final hydraulic lime product.

The primary raw material for hydraulic lime production is limestone or other calcareous materials. Additionally, the production process requires a reliable supply of water and energy, typically in the form of fuel for the kilns. Specialized equipment, such as kilns, slakers, and mixing tanks, are also essential inputs for the manufacture of hydraulic lime.

The primary output of HS code 252230 is hydraulic lime, which is consumed by the 2523 Cement and articles thereof industry for the production of various cement-based products. Hydraulic lime may also be used in the 6801 (Setts, curbstones and flagstones, of natural stone (except slate)) and 6802 (Worked monumental or building stone and articles thereof, other than goods of heading 6801; mosaic cubes and the like, of natural stone (including slate), whether or not on a backing; artificially colored granules, chippings and powder, of natural stone (including slate)) industries for masonry and construction applications.