Which poly(ethylene terephthalate), PET resin is the best one?
Poly(ethylene terephthalate), PET resins have several basic differences follow this notes and find the one which is the best for your application. 1. Intrinsic Viscosity, I.V. - ranging from 0.72 up to 0.85 for injection stretch blow molding. 2. Polymer Type - Homopolymer or Copolymer 3. Residual Acetaldehyde A.A Level - Normal or Reduced 4. Cosmetic Grades - Able to resist crystallization. 1. Intrinsic Viscosity, I.V. PET material for bottles is available in I.V. levels from 0.72 up to 0.85. Lower I.V. is more suited to fine details but will give lower strength in the final container and will have more tendency to flash. High I.V. material will give a stronger bottle but it may be impossible to form fine details in the preform or bottle. Low I.V. materials tend to be better if you need to blow an intricate shape but will result in a container having less strength and will become more difficult to control in the stretch blow process. A higher I.V. material will give better overall...