Standard 9.5mm GTEC plasterboard laminated to extruded polystyrene to create a product which offers a 600% improvement in insulation over standard plasterboard Perfect for window reveals and where space is limited Standards Complied with: BS EN 13950. Composition: Aerated Calcium sulphate di-hydrate enclosed inside a tough paper with bound edges. Core and papers are bonded with starch. Edge glue is PVA. Extruded polystyrene (XPS) is factory bonded to this 9.5 mm board with various thicknesses of this rigid foam using PVA adhesive. Reaction to fire: Euroclass A2-s1, d0 Finishing: GTEC Thermal XP Board can be jointed and finished with GTEC Jointing Systems.