Abstract: The invention relates to an apparatus and method for determining the shearing strength of a thermal insulation. The apparatus (1) comprises a mobile clamping element (2) and alongside the same at least one immobile clamping element (3), each provided with a cavity (2a, 3a) capable of receiving part of a strip-like test specimen (15) to be cut off a thermal insulation. The apparatus is adapted to apply a force F to the mobile clamping element for moving the mobile clamping element (2) relative to the immobile clamping element (3) for achieving the shearing of the presently measured strip (15) at a location (14) between the mobile clamping element (2) and the immobile clamping element (3). The apparatus is further provided with means (16) for measuring the force F for its magnitude. The method comprises cutting a thermal insulation for a strip-like test specimen (15), having certain dimensions in various directions, said strip being then placed in a measuring apparatus (1) for shearing strength.

Abstract: A longitudinal laminate board of binder fixed mineral wool. The laminate board consists of adjacently disposed longitudinally directed pieces, whose fibre planes form a right angle to the plane of the laminate board. The length of the pieces is less than half of that of the laminate board and they are jointed to each other. None of the joints is immediately next to any of the ends of the laminate board or to any of the supports for the board.

Abstract: A longitudinal laminate board of mineral wool and method of making the board are disclosed. The laminate board consists of adjacently disposed pieces at least some of which are shorter than the length of the board and whose fibre plane form an essentially right angle to the plane of the laminate board. The pieces are jointed within the laminate board.