Harmonized System

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Section VI > Chapter 38 > Heading 3802

Explanatory notes

… superficial structure has been modified by appropriate treatment (with heat, chemicals, etc.) in order to make them …         These products are obtained by chemical or heat treatment of certain vegetable or mineral substances (clay, … of natural impurities or added foreign matter. This treatment causes a change in the structure of the basic …

Section XV > Chapter 80

Explanatory notes

… of the ore by washing, or by crushing and flotation. (II)  Treatment of the oxide by roasting, magnetic separation, or … hammered, rolled or extruded. Tin is very resistant to atmospheric corrosion but is attacked by concentrated acids. …

Section XVIII > Chapter 90 > Heading 9018

Section II > Chapter 13 > Heading 1301

Section XI

Section XV > Chapter 76

Explanatory notes

… completely pure. Aluminium may also be obtained by the treatment of certain other ores such as leucite (double … artificially in greater depth by anodising or chemical treatment; the surface is also sometimes coloured during … Certain of the alloys may be improved by age‑hardening treatments. These processes may be followed by tempering. …

Section XV > Chapter 76 > Heading 7607

Explanatory notes

… may have been subjected to the following working or surface treatments : (1)   Heat treatments, such as stress‑relieving or annealing. These …

Section II > Chapter 13 > Heading 1302

Section XVIII > Chapter 90 > Heading 9019

Explanatory notes

… of various movements. It should be noted that such treatment is usually carried out under medical supervision; … leg muscles). Since mechano‑therapy refers only to treatment involving movement of the joint, etc., this … for numerous mechano‑therapeutic purposes (e.g., for treatment of diseases of the joints or muscles of the neck, …

Section XV > Chapter 72 > Heading 7209

Explanatory notes

… often delivered after annealing, normalising or other heat treatment. If they are very thin (generally less than … may have been subjected to the following working or surface treatments : (1)   Flattening. (2)   Annealing, hardening, …