does polypropylene melt?
<answer> Yes, polypropylene melts about 165°C. <context> Effect of Heat. The melting point of polypropylene is about 165°C and while it does not have a true softening point temperature, the maximum processing temperature of the fibre is approximately 140°C. Prolonged exposure to elevated temperatures will cause degradation of the fibre, but anti-oxidants are incorporated in polypropylene fibres to protect them during processing and at normal service temperatures.