Resin and polymer are organic materials. The key difference between resin and polymer is that resins have small molecular weights, whereas polymers have large molecular weights.

Polymers can be divided into 2 major categories:

• Thermosetting/ Thermoforming
  • The raw material will be formed/set after heated up to certain temperature.
    The profile is not able to be reformed after it is formed/set.
    • It includes UP, EP, PF, UF, SI, PU, MF, PI, PABM, BT, DAP…etc.
• Thermoplastic
  • The raw material is rigid and will be melted/liquidized after heated up to deflection temperature.
    The profile is able to be reformed after heated up repeatedly.
  • According to the way of monomers bind with each other, they can be categorized into:
    • Crystalline
      PE, PP, PA(Nylon), POM, PET, PBT, PPS, LCP, PEEK, POB, TPI, PPA, PCT, PEN, PEK, PTFE, PTES…etc.
    • Non-Crystalline
      PS, PVC, ABS, PMMA, TPU, PC, PPO, PSF, PES, PEI, PAI, PAR…etc.
• According to the part performance requirement, the raw material from Crystalline/ Non-Crystalline can be mixed and in order to provide required performance. Common combination includes:
  PC+ABS, PC+PBT, PC+PET, PA+PP, PBT+PET…etc.

This site we discuss thermoplastic are commonly used in injection molding process. Each plastic model from different supplier can have different specification, they include at least but not limited to following items. According to the part requirement, find the related specification and choose accordingly.

• Appearance
  Transparency
• Strength
  Hardness
  Yield Strength
  Flexural Strength
  Impact Resistance
  Highest Working Temperature
  Elongation
  Stretch Strength
• Process
  L/t
  Viscosity
  MI
  Hydroscopic Property
  Shrinkage and Distortion
• Others
  Dielectric Constant
  Sp. Gravity