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Figure 28 – Comparative core costs 5.4.2.3 Thermoplastic honeycomb Core materials made of other thermoplastics are light in weight, offering some useful properties and possibly also making for easier recycling. Their main disadvantage is the difficulty of achieving a good interfacial bond between the honeycomb and the skin material, and their relatively low stiffness. Although they are rarely used in highly loaded structures, they can be useful in simple interior panels. The most common polymers used are: ABS - for rigidity, impact strength, toughness, surface hardness and dimensional stability Polycarbonate - for UV-stability, excellent light transmission, good heat resistance & self-extinguishing properties Polypropylene - for good chemical resistance Polyethylene - a general-purpose low-cost core material 5.4.2.4 Wood Wood can be described as ‘nature’s honeycomb’, as it has a structure that, on a mi- croscopic scale, is similar to the cellular hexagonal structure of synthetic honeycomb. When used in a sandwich structure with the grain running perpendicular to the plane of the skins, the resulting component shows properties similar to those made with man-made honeycombs. However, despite various chemical treatments being available, all wood cores are susceptible to moisture attack and will rot if not well surrounded by laminate or resin. 5.4.2.5 Balsa The most commonly used wood core is end-grain balsa. Balsa wood cores first appeared in the 1940’s in flying boat hulls, which were aluminium skinned and balsa-cored to withstand the repeated impact of landing on water. This performance led the marine industry to begin using end-grain balsa as a core material in FRP construction. Apart from its high compressive properties, its advantages include being a good thermal insulator offering good acoustic absorption. The material will not deform when heated 44 - GTC-6-0417PDF Image | GUIDE TO COMPOSITES
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