400–600 µm (0,40–0,60 mm). 300–400 µm (0,30–0,40 mm). 150–250 µm (0,15–0,25 mm). 90–150 µm (0,09–0,15 mm). 100–200 µm (0,10–0,20 mm). Na2O: 12–15 %. Fe2O3: max. Al2O3: max.
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