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Heading 6901 : Bricks, blocks, tiles and other ceramic goods of siliceous fossil meals (for example, kieselguhr, tripolite or diatomite) or of similar siliceous earths.
This heading covers all articles made of the materials listed in the heading text, whatever their shape (e.g., bricks, blocks, slabs, panels, tiles, hollow bricks, cylinder shells, pipes), whether or not refractory.
The heading excludes :(a) Light non-refractory bricks not containing siliceous fossil meals or similar siliceous earths (e.g., those made from bodies containing chopped straw, sawdust, peat fibre, etc., the organic matter having been burnt away during the firing process to leave a porous structure) (heading 69.04). (b) Filter plates made from a body containing kieselguhr and quartz (heading 69.09).
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