Abstract: A laminated mineral fibre mat consisting of substantially randomly arranged mineral fibres which are held together by organic binders where they cross one another and which form the mat and of a lamination adhering to the mat by means of an organic adhesive, characterized in that a plane substantially free from organic binder is provided in the mat parallel to and in the vicinity of the lamination, whereby the laminated product is rendered fire resistant. The binder-free zone is created prior to lamination by removal of the binder from the mat.