Abstract: Submersible panel (2) for pools, particularly swimming pools (1), consisting of hollow, elongated, modular parts (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h) assembled together. The parts comprise a water inlet at one end and a water outlet at the other. The openings of the panel are connected either directly or indirectly to means for distributing compressed gas. The edges of said panel (1) more or less match the walls of the pool to constitute a pool cover in the upper position and at least one bottom in the submerged position. The upper and lower horizontal surfaces of the panel are plane and free, the measurements of said upper horizontal surface being more or less equal to the length of the pool which is suitable for constituting the cover in the upper position and at least two bottom levels of the pool in the submerged position. Use of the panel (1) to constitute the bottom of the pool.

Abstract: An improved building material element or board having good thermal insulation properties comprising expanded vermiculite granules coated with 2 to 30% by weight, based on the weight of vermiculite, with an organic binder formed into a press cake which is then press heated to form the building element, the improvement comprising that at least a portion of the coated vermiculite granules are recycled particles which increases the density and has a more uniform and more easily sized surface and a process for its preparation.

Abstract: An improved building material element or board having good thermal insulation properties comprising expanded vermiculite granules coated with 2 to 30% by weight, based on the weight of vermiculite, with an organic binder formed into a press cake which is then press heated to form the building element, the improvement comprising that at least a portion of the coated vermiculite granules are recycled particles which increases the density and has a more uniform and more easily sized surface and a process for its preparation.