Stoyko Gyurov, Jordan Georgiev, Nartzislav Petrov, Dimitar Teodosiev STUDY OF POLYMER OXYGEN-FREE DECOMPOSITION PROCESS WITH THE PURPOSE TO PRODUCE CARBON-HYDROGEN CONTAINING SUBSTANCE (CHS) Purpose of the present paper is to examine the oxygen-free decomposition process of polyvinyl alcohol PVA, polypropylene РР and phenol-formaldehyde resin under heating and to obtain data for the quantity of the pyrolysis residue. <...> The thermal decomposition of polyvinyl alcohol PVA, polypropylene РР and phenol-formaldehyde resin has been studied using conventional thermogravimetric technique under vacuum and argon atmosphere at several heating rates between 2 and 12°C/min. <...> Our results shows that the solid residue of the PVA heated in argon medium at 350 °С and holding for 30 min is up to 14% and in vacuum - to 10% of the initial weight. <...> The solid residue of phenol-formaldehyde resin heated to 700°С in argon is up to 23% and in vacuum – to 16% of the initial weight. 1 INTRODUCTION Most non-oxide ceramic materials have the advantages of high melting point, high strength even at high temperature, high wear resistance, low thermal expansion coefficient, and light weight. <...> A new method of carbides production overcomes the above said disadvantages by using as a precursor coated by Carbon-Hydrogen containing Substance (CHS) oxide of the respective metal. <...> The Carbon-Hydrogen containing Substance (CHS) is obtained during thermal decomposition of polyvinylchloride (PVC) powder in inert atmosphere [11]. <...> In the process of its decomposition chlorine containing compounds are released which have carcinogenic effect and that imposes search for alternative solutions. <...> Purpose of the present paper is to examine the oxygen-free thermal decomposition process of PVA, РР and phenol-formaldehyde resin and determine the quantity of the pyrolysis residue. 2 EXPERIMENTAL PROCEDURE 2.1. <...> Thermo gravimetric analysis (TGА) Decomposition of polyvinyl alcohol (PVA), polypropylene (PP) and phenol formaldehyde resin in oxygen-free atmosphere was studied by SETARAM MBT 10-8 thermogravimetric analysis (TGA) and pyrolysis residues was determined as well. <...> Some of the more important characteristics of the electromagnetic scales are: а) maximum effective load 10 g; b) automatic measuring range ±20 mg; c) relative sensitivity 4.10-8 g. resistance furnace is The operation temperature range <...>