| 211 | K7766 | BRITISH STANDARDS INSTITUTION |
| BS1806 | K7766 | BRITISH STANDARDS INSTITUTION |
| BS1806-211 | K7766 | BRITISH STANDARDS INSTITUTION |
| BSM48-211 | K7766 | BRITISH STANDARDS INSTITUTION |
| OS.16 | U4330 | HALLITE SEALS INTERNATIONAL LTD T/A I POLYTEK |
| BS211-9000771 | U4330 | HALLITE SEALS INTERNATIONAL LTD T/A I POLYTEK |