The use of low melting sulphate glasses and metal chelates as fire and smoke retarder additives for PVC has been described . The results obtained with several metal containing addivtives, flame retardent plasticizers, low melting sulphate glasses and transition metal chelates are briefed below.The severity of exposure required to produce combustion and the results of the combustion process vary as widely as the materials themselves. Since overall fire hazards is a function not only of the fire performance of the material but also of the degree of exposure of the material and the probability of occurrence and the nature of the fire involved. All of these factors must be considered in determing the degree of inherent fire resistance which the material must possess to be satisfactory for a particular application.
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