… Filter blocks, slabs and plates, of paper pulp. …
Explanatory notes
… 48.12 ‑ Filter blocks, slabs and plates, of paper pulp. These are composed … of vegetable fibres (cotton, flax, wood, etc.) with a high cellulose content, compressed together in the form of … the aid of any binding materials, the fibres remaining in a loosely adherent condition. The vegetable fibres may be …