POLYIMIDE ADHESIVE FILM USED TO FORM A PERMANENT PROTECTIVE SKIN ON LIGHTWEIGHT THERMAL INSULATION BLANKETS USED, FOR EXAMPLE , IN AEROSPACE APPLICATIONS. THE PRODUCT IS COMPOSED OF TWO LAYERS OF POLYIMIDE FIM, ONE LAYER ACTING AS MOISTURE BARRIER (MB). ON BOTH SIDES OF THE FILM THERE IS A POLYIMIDE ADHESIVE. THE ADHESIVE IS PROTECTED ON BOTH SIDES BY A WOVEN FIBERGLASS CARRIER. THE CARRIER PROTECTS THE ADHESIVE SIDE OF THE FILMS AND IS ULTIMATELY DISCARDED. THE PRODUCT IS NOT PERMANENTLY TACKY AND DOES NOT FIRMLY ADHERE TO A VARIETY OF DISSIMILAR SURFACES AT ROOM TEMPERATURE. THE ADHESIVE REQUIRES HEATING ABOVE NORMAL ROOM TEMPERATURE (EG OVEN OR AUTOCLAVE) PRIOR TO ITS USE. THE FILM MEASURES APPROXIMATELY 4 FOOT WIDE AND 185 FOOT LONG AND IS PRESENTED IN ROLLS.

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 3920 - Other plates, sheets, film, foil and strip, of plastics, non-cellular and not reinforced, laminated, supported or similarly combined with other materials: GIR 6 HAS BEEN USED TO CLASSIFY THE GOODS TO SUBHEADING LEVEL 3920 - OF OTHER PLASTICS CN CODE 39209921 - OF CONDENSATION OR REARRANGEMENT POLYMERISATION PRODUCTS, WHETHER OR NOT CHEMICALLY MODIFIED. ALSO CLASSIFIED IN ACCORDANCE WITH CHAPTER 39, GENERAL CHAPTER NOTE 1 CHAPTER 39, GENERAL CHAPTER NOTE 10