The present invention relates to the field of fire and electric power safety, in particular to methods for detection of pre-fire situations arising from local overheating of electrical equipment, and is intended to prevent fires arising from electrical wiring faults, in particular, faults in wiring devices. The method is based on measuring the content of low-boiling substances in the atmosphere of the protected room, which are enclosed in capsules with an opening temperature in the range of 80-200 ° C, fixed on current-carrying parts, and released into the external environment when these capsules are opened by heating the mentioned parts to the appropriate temperature. The technical result of the claimed solution is to increase the probability of detecting a pre-fire situation at an early stage.

A polymerization initiator for cationically polymerizable organic substances which comprises a crystalline ion-association substance having such a unique property that it can initiate not only photopolymerization but thermal polymerization when used in polymerizing a cationically polymerizable organic substance. The crystalline ion-association substance is represented by the general formula (I):



        [{C₅(R¹)_n}_2mM_m]¹⁺[{B(R²)₄}^-]₁.

A nitrogen halide or carbon halide gas is caused to pass through a packed layer in which at least one granular material selected from the group consisting of silicon, molybdenum, tungsten, molybdenum silicide, and tungsten silicide is heated, so that the halide gas and granular material react with each other. The reaction product is treated with an alkali. In this manner, a toxic halide gas can be detoxicated with high efficiency.

Zur Herstellung von Hexachlorethan wird gasförmiges Chlor mit flüssigem Hexachlorbutadien in Gegenwart von Sauerstoff umgesetzt. Als Sauerstofflieferant kann Luft eingesetzt werden. Der Druck des Reaktionssystems liegt zwischen 1 und 50 bar (abs.), die Reaktions­temperatur zwischen 100 °C und der Siedetemperatur der flüssigen Phase bei dem jeweils festgelegten Druck.

A chlorinated paraffins composition of low or zero toxicity comprising a chlorinated mixture of a C₁₂ paraffin and one or more paraffins of chain length greater than 12 carbon atoms and containing from 20 to 70% by weight chlorine based on the chlorinated paraffins; preferably a chlorinated mixture of C₁₂, C₁₃, C₁₄ and optionally C₁₅ paraffins.

Die Erfindung betrifft Stabilisatorkombinationen für die Hochtemperaturstabilisierung von Polychloralkanen, die aus 10 bis 90 Gew.-% einer Epoxyverbindung und 90 bis 10 Gew.-% eines tertiären Esters der phosphorigen Säure bestehen.