A HIGH PERFORMANCE FLOW FILTER FOR USE IN THE PHARMACEUTICAL INDUSTRY. IT IS USED TO SEPARATE COMPONENTS IN A LIQUID SOLUTION OR SUSPENSION ON THE BASIS OF THEIR SIZE. IT CONSISTS OF 3 MICROPOROUS MEMBRANES WHICH HAVE PORE DIAMETERS IN VARIOUS MICROMETER RANGES AND ARE USED FOR SEPARATIONS REQUIRING THE RETENTION OF SUSPENDED SOLIDS.

CLASSIFICATION IS DETERMINED BY THE PROVISIONS OF THE GENERAL RULES 1 AND 6 FOR THE INTERPRETATION OF THE COMBINED NOMENCLATURE; THE TEXT OF CODES 8421, 8421 29, 8421 29 80 90; THE HARMONISED SYSTEM EXPLANATORY NOTES TO HEADING 8421;