The best replacement for polypropylene is polyethylene.

The best alternatives to polypropylene are rated as following:
★★★★★  polyethylene
★★★★  polyester
★★★★  nylon
★★★  polycarbonate
★★  pvc
★★  polystyrene
★★  wool
★  wool rugs
★  abs
★  olefin
★  polyethylene bags
★  glassine
★  nylon webbing
★  wool rug
  pet
  nylon carpet
  hdpe
  coolmax
  nylon rope
  olefin carpet
  wool carpet
  polyester capacitors
  polycarbonate luggage
  phenolic
  mylar
  abs plastic
  polypropylene
  polypropylene copolymer
  silk
  acetal
  propylene
  copolymer polypropylene
  capilene

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Google Trends

Scale is based on the average worldwide traffic of polypropylene in all years. Click on graph for more.
polypropylene
polyethylene
polyester