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20.13.21 - Metalloids
20.13.21.11 - Chlorine
20.13.21.16 - Iodine; fluorine; bromine
20.13.21.20 - Sulphur, sublimed or precipitated; colloidal sulphur
20.13.21.30 - Carbon (carbon blacks and other forms of carbon, n.e.c.)
20.13.21.40 - Boron; tellurium
20.13.21.50 - Silicon
20.13.21.80 - Phosphorus; arsenic; selenium
Metalloids
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