METAL CLOSURES, MADE OF ALUMINIUM. SCREW, CRIMP AND SNAP TYPES. USED WITH CHROMATOGRAPHY INSTRUMENTATION, BOTH HPLC (HIGH PERFORMANCE LIQUID CHROMATOGRAPHY) AND GC (GAS CHROMATOGRAPHY). CONSISTING OF A PRECISION DESIGNED SCREW, CRIMP AND SNAP CAPS WITH A SILICONE/PTFE SEPTA, GIVING A LEAK AND EVAPORATION FREE CLOSURE FOR ACCURATE AND REPEATABLE ANALYSIS. IT ALLOWS ACCESS TO A SAMPLE BY AN AUTOSAMPLE NEEDLE. THE SILICONE IS USED AS IT RESEALS AFTER PENETRATION KEEPING THE SAMPLE ENCLOSED AND FREE FROM EVAPORATION, WHILST THE PTFE PROVIDES AN INERT BARRIER TO ENSURE THERE IS NO REACTION BETWEEN THE SILICONE AND THE SAMPLE. LOOSELY PACKED IN CLEAN ROOM CONDITIONS, IN A SEALABLE PLASTIC BAG. EACH APPROX SIZE 12 X 6 MM.

CLASSIFICATION HAS BEEN DETERMINED IN ACCORDANCE WITH THE FOLLOWING:- GENERAL INTERPRETATIVE RULES (GIR)S: GIR 1 HAS BEEN USED TO CLASSIFY THIS PRODUCT BY THE TERMS OF HEADING 7616 - OTHER ARTICLES OF ALUMINIUM. GIR 6 HAS BEEN USED TO CLASSIFY THE GOODS TO SUBHEADING LEVEL 761699 - OTHER THAN NAILS, TACKS, STAPLES (OTHER THAN THOSE OF HEADING 8305), SCREWS, BOLTD, NUTS, SCREW HOOKS, RIVETS, COTTERS, COTTER-PINS, WASHERS AND SIMILAR ARTICLES; OTHER THAN CLOTH, GRILL, NETTING AND FENCING, OF ALUMINIUM WIRE; OTHER. CN CODE 76169990 - OTHER THAN CAST; OTHER. TARIC CODE 7616999090 - OTHER THAN PREVIOUSLY SPECIFIED. ALSO CLASSIFIED IN ACCORDANCE WITH: THE HSEN'S OF HEADING 7616 REFERS. ITEM IS EXCLUDED FROM HEADING 9027 BY NOTE 1 (f) TO CHAPTER 90.