Harmonized System

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Section XIII > Chapter 69 > Heading 6904

Explanatory notes

… is made from a body composed of kaolin (or kaolinic clays), quartz, feldspar (or feldspathoïds), and sometimes calcium …

Section VI > Chapter 28 > Heading 2833

Explanatory notes

… magnesium sulphate (MgSO 4 .7H 2 O) (Epsom salts, Seidlitz salts) obtained by purifying kieserite, or by the …

Section XVI > Chapter 85 > Heading 8518

Explanatory notes

… sets up strains in a specially cut piece of crystal (e.g., quartz or rock crystal), thus causing the production of …

Section XV > Chapter 72