Laminated plasterboard consisting of a 100% natural gypsum core tightly bonded to two cellulose sheets. The board characteristics give it type A classification as per standard EN-520:2004 +A1 2009. This type of board is used in special applications such as walls for lift shafts, stairs and technical blocks which required greater surface hardness, damp-proofing and fire resistance. It has a nominal thickness of 25 mm, with a nominal width of 600 mm. The long edges of this board are cardboard-coated and straight (BC).