A board that provides superior fire resistance. It complies with BS1230 Type 5 and BS EN 520 Types D and F. The board is composed of Aerated Calcium sulphate di-hydrate with fillers and fibres enclosed inside a tough paper with bound edges. Core and papers are bonded with starch. Edge glue is PVA. It has a reaction to fire rating of Euroclass A2-s1, d0.