A PACKER FOR USE IN THE GAS AND OIL INDUSTRIES. IT COMPRISES OF A METAL PIPE TO WHICH RUBBER IS BONDED AND THEN SECURED IN PLACE USING METAL END RINGS. IT IS USED TO ISOLATE ZONES IN A WELL. IT WORKS BY SELECTING RUBBER COMPOUNDS THAT WILL EXPAND IN THE PRESENCE OF CERTAIN WELLBORE FLUIDS. THE RUBBER COMPOUND AND OUTSIDE DIAMETER ARE DESIGNED SO THAT AFTER A PREDETERMINED TIME PERIOD THE RUBBER WILL HAVE EXPANDED SO MUCH THAT IT MAKES CONTACT WITH THE INSIDE DIAMETER OF THE HOLE IN WHICH THE PACKER IS LOCATED. THIS THEN ISOLATES AN INNER STRING FROM AN OUTER AND ALSO SEPARATES FLUIDS ABOVE AND BELOW THE RUBBER ELEMENT.

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 4016 OTHER ARTICLES OF VULCANISED RUBBER OTHER THAN HARD RUBBER GIR 6 HAS BEEN USED TO CLASSIFY THE GOODS TO SUBHEADING LEVEL 401699 OTHER THAN ELSEWHERE SPECIFIED WITHIN THIS SUB-HEADING CN CODE 40169991 RUBBER-TO-METAL BONDED PARTS: TARIC CODE 4016999190 OTHER THAN FOR TECHNICAL USES, FOR USE IN CIVIL AIRCRAFT ALSO CLASSIFIED IN ACCORDANCE WITH: SECTION XVI NOTE 1 (a) CHAPTER 40 NOTE 1. HSENS TO HEADING 4016