cover image


Family of polymers / From Wikipedia, the free encyclopedia

Dear Wikiwand AI, let's keep it short, summarize this topic like I'm... Ten years old or a College student

Polycarbonates (PC) are a group of thermoplastic polymers containing carbonate groups in their chemical structures. Polycarbonates used in engineering are strong, tough materials, and some grades are optically transparent. They are easily worked, molded, and thermoformed. Because of these properties, polycarbonates find many applications. Polycarbonates do not have a unique resin identification code (RIC) and are identified as "Other", 7 on the RIC list. Products made from polycarbonate can contain the precursor monomer bisphenol A (BPA).

Quick facts: Polycarbonate, Physical properties, Density ....
Repeating chemical structure unit of
Polycarbonate made from bisphenol A
Transmission spectrum of polycarbonate
Physical properties
Density (ρ)1.20–1.22 g/cm3
Abbe number (V)34.0
Refractive index (n)1.584–1.586
Limiting oxygen index25–27%
Water absorptionEquilibrium (ASTM)0.16–0.35%
Water absorption—over 24 hours0.1%
Radiation resistanceFair
Ultraviolet (1–380 nm) resistanceFair
Mechanical properties
Young's modulus (E)2.0–2.4 GPa
Tensile strength t)55–75 MPa
Elongation (ε) at break80–150%
Compressive strength c)>80 MPa
Poisson's ratio (ν)0.37
Izod impact strength600–850 J/m
Notch test20–35 kJ/m2
Abrasive resistance ASTM D104410–15 mg/1000 cycles
Coefficient of friction (μ)0.31
Speed of sound2270 m/s
Thermal properties
Glass transition temperature (Tg)147 °C (297 °F)
Heat deflection temperature
  • 0.45 MPa: 140 °C (284 °F)
  • 1.8 MPa: 128–138 °C (262–280 °F)
Vicat softening point at 50 N145–150 °C (293–302 °F)[1]
Upper working temperature115–130 °C (239–266 °F)
Lower working temperature−40 °C (−40 °F)[2]
Thermal conductivity (k) at 23 °C0.19–0.22 W/(m·K)
Thermal diffusivity (a) at 25 °C0.144 mm²/s[3]
Linear thermal expansion coefficient (α)65–70 × 10−6/K
Specific heat capacity (c)1.2–1.3 kJ/(kg·K)
Electrical properties
Dielectric constant r) at 1 MHz2.9
Permittivity (ε)2.568 × 10−11 F/m
Relative permeability r) at 1 MHz0.866(2)
Permeability (μ) at 1 MHz1.089(2) μN/A2
Dissipation factor at 1 MHz0.01
Surface resistivity1015 Ω/sq
Volume resistivity (ρ)1012–1014 Ω·m
Chemical resistance
Aromatic hydrocarbonsPoor
Greases and oilsGood-fair
Halogenated hydrocarbonsGood-poor
Gas permeation at 20 °C
Nitrogen10–25 cm3·mm/(m2·day·Bar)
Oxygen70–130 cm3·mm/(m2·day·Bar)
Carbon dioxide400–800 cm3·mm/(m2·day·Bar)
Water vapour1–2 g·mm/(m2·day) @ 85%–0% RH gradient
Price2.6–2.8 €/kg[4]