| 6909190020 |
Silicon nitride (Si3N4) rollers or balls |
| 6909190025 |
Ceramic proppants, containing aluminium oxide, silicon oxide and iron oxide |
| 6909190030 |
Supports for catalysts, consisting of porous cordierite or mullite ceramic pieces, of an overall volume of not more than 65|l, having, per cm$2|of the cross-section, not less than one continuous channel which may be open at both ends or stopped at one end |
| 6909190040 |
Ceramic-carbon absorption or adsorption cartridges of fuel motor vehicle systems, with the following characteristics: -extruded fired ceramic bound multicellular cylindrical structure, -5 % or more by weight but not more than 70 % by weight of activat |
| 6909190050 |
Ceramic articles made of continuous filaments of ceramic oxides, containing by weight: -|2|% or more of diboron trioxide, -|28|% or less of silicon dioxide and -|60|% or more of dialuminium trioxide |
| 6909190060 |
Supports for catalysts, consisting of porous ceramic pieces, of a blend of silicon carbide and silicon, with a hardness of less than 9|on the Mohs scale, with a total volume of not more than 65|litres, having, per cm$2|of the surface of the cross section |
| 6909190070 |
Supports for catalysts or filters, consisting of porous ceramics made primarily from oxides of aluminium and titanium; with a total volume of not more than 65|litres and at least one duct (open on one or both ends) per cm$2|of cross section |
| 6909190090 |
Other |
