Wool contains high amount of what that help to do not burn the cloth
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Answer:
While most textile fibres are polymers containing mainly carbon and hydrogen that can burn easily, wool also contains high levels of nitrogen and sulphur. In fact many fire retardant additives used for other materials are high in nitrogen. Wool therefore requires higher levels of oxygen in the surrounding atmosphere to accelerate combustion. The limiting concentration of oxygen required to support combustion of wool in standard tests is higher than the ambient oxygen concentration in air (21%). Therefore it is difficult to ignite wool, but once ignited, the flame speads slowly and it is easy to extinguish.
wool does not melt,drip or stick to skin when it burns . wools inherent fire resistance comes from its naturally high nitrogen and water content . therefore wool contains high amount of nitrogen,sulphur,water content that help to do not burn the cloth