Polycarbonate vs ABS for CNC Machined Parts

Polycarbonate offers 250x the impact resistance of glass with optical clarity, ideal for safety shields and lenses. ABS is the cost-effective choice for prototypes, housings, and parts where transparency is not needed.

Side-by-Side Property Comparison

PropertyPolycarbonate (PC)ABS (Acrylonitrile Butadiene Styrene)
Tensile Strength65 MPa (9.4 ksi)44 MPa (6.4 ksi)
Yield Strength62 MPa (9 ksi)43 MPa (6.2 ksi)
HardnessRockwell M70Rockwell R105
Density1.20 g/cm³1.05 g/cm³
Machinability Rating75/10082/100
Thermal Conductivity0.20 W/m·K0.17 W/m·K
Melting Point267 °C (softens at 150°C)200–260 °C (processing range)
Tolerance±0.03 mm±0.05 mm

Key Differences

PropertyPolycarbonate (PC)ABS (Acrylonitrile Butadiene Styrene)Winner
Impact Resistance250x glassGoodPolycarbonate
TransparencyOptically clearOpaquePolycarbonate
Machinability75/10082/100ABS
Cost~$5/kg~$3/kgABS
Max Temperature130°C80°CPolycarbonate
Tensile Strength65 MPa44 MPaPolycarbonate

Which Material Should You Choose?

Choose Polycarbonate (PC) when:

  • Transparent parts and windows
  • Safety shields and guards
  • Optical components and lenses
  • Parts requiring high impact strength
  • Electrical insulation
View Details Polycarbonate (PC)

Choose ABS (Acrylonitrile Butadiene Styrene) when:

  • Prototypes and mock-ups
  • Housings and enclosures
  • Budget-conscious projects
  • Parts to be painted or plated
  • Non-critical consumer products
View Details ABS (Acrylonitrile Butadiene Styrene)

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