Abstract: A sealing system for sealing one or more flasks (10) with a longitudinal X-X' axis, open at a first end thereof (11) for introducing a sample and positioned inside microwave apllication cavity (100) for heating the sample is described. The system of the invention comprises a cap (20) to be partially inserted in the flaask along the X-X' axis so as to close the open end thereof and retaining meaans (30) for holding the cap in a flask sealing position, wherein the portion (22) of said cap which is inserted in the flask has a peripheral skirt (23) capable of sealingly engaging the inner wall (12) of the flask under an excess pressure created therein by heating the sample with microwaves.

Abstract: A device is mountable to the opening of a receptacle in which fumes are generated. The device includes a condensation chamber into which the fumes rise and are condensed. The condensed liquid flows back into the receptacle. A tube passing through the condensation chamber and is connectable to a source of suction which causes purging air to be circulated through the receptacle by drawing purging air into the receptacle through the condensation chamber and discharging the air through the tube.