DISADVANTAGES OF POLYPROPYLENE FIBERS: The main drawbacks of PP fibers are listed below: Low melting temperature which prevents it from being ironed like cotton, wool, nylon etc.,Hard to be dyed after manufacturing, except after substantial treatment and modification,High crystallinity and poor thermal conductivity leads to limited texturizability. [Drawn polypropylene requires a contact time of 2 seconds in the heater compared to PET (POY) which requires only 0.4 seconds]Poor UV and thermal stability which requires addition of expensive UV stabilizers and antioxidants to overcome this problem,Poor resilience compared to PET and Nylon,Creeping due to its low Tg(-15 to -20°C),Poor adhesion to glues and latex, andFlammable which melts and burns like wax.