The contents of this paper are as follows;
1) The description of combustion phenomena by means of a mathematical model, and definition of the fields and technical terms.
2) The flammability test method derived from the mathematical model and comparison with practical combustion.
3) Theoretical analysis and mathematical formulation of fire-retarding effect by means of inert fillers such as calcium carbonate, clay, etc. loaded in polymer matrix.
4) Establishment of the causalities between fire retarding effects and the decomposition temperature of each material compounded in rubber.
5) Search for optimum balance between chlorine contents and Sb
2O
3 by way of fire-proofing.
6) Establishment of the correlationship between the general flammability test and the oxygen index method (ASTM D2863-70). Oxygen index for self-extinguishing depends upon the hardness, one of physical properties of rubber, in addition to the chemical composition. The harder the rubber is, the lower its O.I.
7) Bromine has an ability to reach a far higher oxygen index than that of chlorine as a fire-retardant.
8) Establishment of the relationship between fire-retarding effect and chemical structure of the retardants.
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