Which one of the following statements is not correct? Vulcanisation of rubber makes it

Which one of the following statements is not correct? Vulcanisation of rubber makes it Correct Answer Soft and flexible

In order to give more strength and more elasticity, natural rubber is heated with sulphur or sulphur compounds at 150°C temperature. Vulcanized rubber has good tensile strength. The working temperature of vulcanized rubber is enhanced up to 100°C. It has good resistance to organic solvents.
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