Perfluoropolyethers having fluorinated epoxy groups positioned along their perfluoropolyether chain, and free from peroxidic oxygen, are obtained by means of a low-temperature oxidation process, in the liquid phase, with molecular oxygen and in the presence of U.V. light, of a mixture of a perfluorinated monoolefin and a perfluorinated conjugated diene, and by the subsequent photochemical decompos...

1. A refractory thixotropic self-hardening vibration compound on a magnesite base to produce a vibration density of at least 3.0 g/cm**3 , characterized by the following chemical composition (in % by weight) : 0.1 to 2.0% SiO2 0.1 to 30% Al2 O3 0.5 to 3.0% P2 O5 0.2 to 1.5% K2 O plus Na2 O plus LiO2 0.1 to 2.0% Fe2 O3 0.1 to 0.5% B2 O3 0.1 to 3.0% CaO residue MgO and the following crystallographic...

1. A refractory thixotropic self-hardening vibration compound on a zirconium silicate base for producing a vibration density of at least 3.5 g/cm3, characterized by the following chemical composition (in % by weight) : 20 to 30% SiO2 20 to 45% Al2 O3 0.7 to 1.4% TiO2 0.2 to 0.8% P2 O5 0 to 1.5% K2 O+Na2 O+LiO2 0 to 1.0% Fe2 O3 0 to 0.05% CaO residue ZrO2 and having the following base refractory ma...

The lock housing (1) fits into a door panel, and the lock bolt (3) is movable by a key between the drawn-in and projecting -locked - positions. On its surface facing the closure plate, the bolt has two contacts (5,7). The contacts are electrically insulated from the bolt and from one another, and are connected to electrical leads (9,11). They are spring-loaded so that they normally project outside...

Gas purificn. by recirculation and agglomeration by spraying flue gas with a slurry through one or more nozzles in a separator is claimed. The solid particles formed are brought to agglomerate in a turbulence zone and the larger ones are sepd. by a baffle and led to a container for disposal. The remaining particles are fed to a second separator comprising a gas cooler and a baffle to separate part...

A grater consists of two generally rectangular and flat grater plates 2, 3 and a generally flat and rectangular board 4. The grater plates 2, 3 and the board 4 can be pivotably connected to each other at the adjoining end edges. When the plates 2, 3 and the board 4 are connected to each other, they form the shape of a rigid triangular tube configuration. At least one of the connections between the...

The ends of the smaller U profiles (20) are insertable into the larger profiles (10). An incision (15) in the one U-arm (13) of the large U-profiles (10) accommodates, in the as assembled position, an outwardly directed flange (24) belonging to one U-arm (23) of the small U-profiles (20). - The other arms (11,12) of the U-profiles (10,20) can be locked with each other by a sprung tongue (28) in th...