Abstract: A method of manufacturing a polycrystalline silicon carbide wafer includes the following stages: heat treatment of a polycrystalline silicon carbide slab; thinning of the polycrystalline silicon carbide slab, the thinning comprising a correction, by withdrawal of material from the polycrystalline silicon carbide slab, of a deformation brought about by the heat treatment.

Abstract: This invention relates to a system of double cap for the handling and transferring of hazardous materials between two vessels containing radioactive or toxic materials or pathogenic microorganisms. The system of the present invention includes a particular metal-metal sealing embodied between the cap and flange of a first container or water-tight compartment, and the cap and flange of a second container.

Abstract: This invention pertains to a system of “Double cap for the handling and transfer of hazardous materials” between two vessels containing radioactive or toxic materials or pathogenic microorganisms. This system includes a particular metal-metal sealing embodied between the cap and flange of a first container or water-tight compartment, and the cap and flange of a second container, the latter being a 200-litre standardized barrel or container. This double cap system for the handling and transfer of hazardous materials comprises a first cap (4) of a first container subject to being coupled to a second cap (2) of a second container “a”, made of metallic materials that are coupled to form a double cap wherein said caps have metallic flanges (1a)(1b)(3) for mutual coupling thereof.