| • Low water absorption: In a salt-water environment we have a potential corrosion problems and degradation due to the low resistance of certain cores to water vapour permeability. A closed cell structure is approved for use in the marine environment. The core would have no loss of strength after soaking the material in water. Also must be tested and approved for use in the boundaries of integral diesel fuel tanks rigorously tested against IMO criteria for use in the structure of rescue craft. • Compatibility with other composite materials: Core materials must be compatible with all commonly used composite manufacturing techniques and materials. It must be used successfully with polyester, vinyl ester and epoxy resins, and can be processed using wet lamination, infusion and prepreg methods. An excellent thermal stability let the core be cured at the higher temperatures required of most prepregs, as well as used successfully on dark coloured hulls, which are exposed to hot climates. Less stable foams can outgas and cause delamination in such conditions. • Low cost: is a balance between cost of core material, cost of resin volume would absorb and cost of processing technique. The STRUCT-CORE is the most attractive offer due its proper- |