BMS 5-154 05 film adhesive Sanding PLY 120 fiberglass BMS 5-154 GR 05 film adhesive Carbon fabric 3K-70-PW at ±45 Figure 7-13.  The use of film adhesive mess, Kevlar®, fiberglass, and carbon fiber. Figure 7-14.  A roll of film adhesive. Figure 7-15.  Two-part paste adhesive. Description of Sandwich Structures Foaming Adhesives Most foaming adhesives are 0.025-inch to 0.10-inch thick  sheets of B staged epoxy. Foam adhesives cure at 250 °F or  350 °F. During the cure cycle, the foaming adhesives expand.  Foaming adhesives need to be stored in the freezer just like  prepregs, and they have only a limited storage life. Foaming  adhesives are used to splice pieces of honeycomb together  in a sandwich construction and to bond repair plugs to the  existing core during a prepreg repair.  [Figure 7-16] Theory A sandwich construction is a structural panel concept  that consists in its simplest form of two relatively thin,  parallel face sheets bonded to and separated by a relatively  thick, lightweight core. The core supports the face sheets  against buckling and resists out-of-plane shear loads. The  core must have high shear strength and compression stiffness.  Composite sandwich construction is most often fabricated  using autoclave cure, press cure, or vacuum bag cure. Skin  7-10