| 2849.90    |            | Other | 
| 2849.90    | 010        | - Boron carbide, niobium carbide and tantalum carbide | 
| 2849.90    | 090        | - Other | 
| 28.50      |            |  | 
| 2850.00    | 000        | Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined, other than compounds which are also carbides of heading 28.49 | 
| 28.52      |            | Inorganic or organic compounds of mercury, whether or not chemically defined, excluding amalgams | 
| 2852.10    |            | Chemically defined | 
| 2852.10    | 100        | 1 Certified reference materials | 
| 2852.10    |            | 2 Inorganic compounds and articles thereof: | 
| 2852.10    | 210        | (1) Sulphates | 
| 2852.10    | 220        | (2) Chemical preparations for photographic uses (other than varnishes, glues, adhesives and similar preparations) ; unmixed products for photographic uses, put up in measured portions or put up for retail sale in a form ready for use | 
| 2852.10    |            | (3) Other | 
| 2852.10    | 291        | - Mercury carbides | 
| 2852.10    | 299        | - Other | 
| 2852.10    |            | 3 Organic compounds and articles thereof: | 
| 2852.10    |            | (1) Tanning extracts of vegetable origin; tannins and their salts, ethers, esters and other derivatives: | 
| 2852.10    | 911        | A Tannins and their derivatives | 
| 2852.10    | 919        | B Other | 
| 2852.10    | 920        | (2) Albuminoidal substances and their derivatives, excluding albuminates and other albumin derivatives | 
| 2852.10    | 990        | (3) Other | 
| 2852.90    |            | Other | 
| 2852.90    |            | 1 Inorganic compounds and articles thereof: | 
| 2852.90    | 110        | (1) Polysulphides |