POLYIMIDE ADHESIVE FILM USED TO FORM A PERMANENT PROTECTIVE SKIN ON LIGHTWEIGHT THERMAL INSULATION BLANKETS USED, FOR EXAMPLE, IN AEROSPACE APPLICATIONS. THE FILM IS PRODUCED AS THE POLYMER (POLYIMIDE) FORMED INTO SHEETS AND THEN THE ADHESIVE (ALSO POLYIMIDE) IS APPLIED TO ONE SIDE. THE SIDE ON WHICH THE ADHESIVE HAS BEEN APPLIED HAS A A WOVEN FIBERGLASS CARRIER. THE CARRIER PROTECTS THE ADHESIVE 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 REQUIRIES HEATING ABOVE NORMAL ROOM TEMPERATUE (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