Natural Hydraulic Lime NHL 3.5
NHL 3.5 is a moderately hydraulic lime derived from argillaceous limestone, fired at low temperatures to retain pozzolanic reactivity. It offers balanced strength for lime mortars in masonry restoration and breathable plasters. HTS 2522.30.00.00 covers this as pure hydraulic lime before mixing into final products.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If purity yields non-hydraulic set
Insufficient clay impurities for hydraulic reaction; reverts to standard slaked lime.
If sold as dolomite ramming mix
Chapter note exclusion sends dolomite-based mixes to heading 3816.
If chemically processed to high purity hydroxide
Exceeds lime definitions, entering inorganic chemicals chapter.
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Import Tips & Compliance
• Include lab analysis showing 10-20% hydraulic components to confirm classification distinct from 2522.20 slaked lime
• Ensure packaging prevents premature hydration, which could lead to customs disputes over state of lime
• Declare accurately as unmixed lime to steer clear of Chapter 38 headings for prepared binders
Related Products under HTS 2522.30.00.00
Natural Hydraulic Lime NHL 2
Natural hydraulic lime NHL 2 is a powdered binder made from limestone containing natural silica and alumina impurities, calcined to produce hydraulic properties. It sets and hardens through a chemical reaction with water, even underwater, distinguishing it from non-hydraulic limes. Classified under HTS 2522.30.00.00 as hydraulic lime, excluding calcium oxide and hydroxide of heading 2825.
Emoder Natural Hydraulic Lime
Emoder is a commercial grade natural hydraulic lime from calcined marlstone, providing early strength for pointing and rendering in conservation projects. Its hydraulic nature allows curing in damp conditions without pure air slaking. Falls squarely under HTS 2522.30.00.00 for hydraulic lime other than 2825 products.
Hotkin Natural Hydraulic Lime NHL 5
Hotkin NHL 5 is an eminently hydraulic lime from silica-rich limestone, suitable for structural mortars and hydraulic renders requiring higher strength. It hardens via both carbonation and hydration processes. HTS 2522.30.00.00 specifically includes this as hydraulic lime excluded from 2825.
Solem Natural Hydraulic Lime Powder
Solem hydraulic lime powder is finely ground from naturally impure chalk, used in lime-pozzolan mortars for sustainable construction. It develops strength through hydraulic set in low-permeability environments. Classified in 2522.30.00.00 as unmixed hydraulic lime.