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Abstract

Equipment for testing or test sampling liquid metal by introducing a protection sleeve (3; 3'; 3') together with a testing or sampling means (2; 11) provided inside the protection sleeve. The protection sleeve comprises a thermoinsulating tube (3; 3'; 3') made of synthetic amorphous mineral fibers, preferably fibres of diabase type and having a sagging point of 1,000.degree.-1,200.degree. C. according to the standards of the Swedish Institute for Materials Testing, and bound with an evenly distributed binder comprising or including among other things a binder component of organic type, for instance a thermosetting resin like phenol resin, carbamide resin or melamine resin and/or substances incorporated in the fiber material, for instance crystal water containing salts or carbonates which at the temperature of the liquid metal spontaneously and successively emit gases. The mineral fibre tube (3; 3'; 3') can be manufactured from mineral fibres having an original weight per unit of volume of 20-70 kg/m3, which have been compressed to a weight per unit of volume of 200-800 or preferably 500-700 kg/m3. Preferably the binder is added in an amount of 2-8 % by weight. The intensity of the turbulent flow in the molten metal is controlled by varying the amount of binder in the thermoinsulating mineral fibre tube and/or by varying the hardness of the mineral fibre tube.

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First Claim