GE Plastics LEXAN 121R Polycarbonate 

Physical Properties Metric English Comments
Density 1.2 g/cc 0.0434 lb/in³  ASTM D 792
Water Absorption 0.15 % 0.15 %  24 hours @ 73F; ASTM D 570
Water Absorption at Saturation 0.35 % 0.35 %  Equilibrium, 73F; ASTM D 570
Water Absorption at Saturation 0.58 % 0.58 %  Equilibrium, 212F; ASTM D 570
Linear Mold Shrinkage 0.005 - 0.007 cm/cm 0.005 - 0.007 in/in  Flow, 0.125 inch; ASTM D 955
Melt Flow 17.5 g/10 min 17.5 g/10 min  300C/1.2 kgf (O); ASTM D 1238

Mechanical Properties
Hardness, Rockwell M 70 70  ASTM D 785
Hardness, Rockwell R 118 118  ASTM D 785
Tensile Strength @ Break 68.9 MPa 10000 psi  Type I, 2.0 in/min; ASTM D 638
Tensile Strength @ Yield 62.1 MPa 9000 psi  Type I, 2.0 in/min; ASTM D 638
Elongation at Break 125 % 125 %  Type I, 2.0 in/min; ASTM D 638
Elongation at Yield 7 % 7 %  Type I, 2.0 in/min; ASTM D 638
Flexural Modulus 2.34 GPa 340 ksi  0.05 in/min, 2" span; ASTM D 790
Flexural Yield Strength 96.5 MPa 14000 psi  0.05 in/min, 2" span; ASTM D 790
Fatigue Strength 6.89 MPa 1000 psi  Fatigue Limit, 2.5 MM cycles; ASTM D 671
Izod Impact, Unnotched 32 J/cm 60 ft-lb/in  73F; ASTM D 4812
Gardner Impact @ 23°C 62.1 J 45.8 ft-lb  Instrumented Impact Energy @ peak, 73F; ASTM D 3763
Tensile Impact Strength 546 kJ/m² 260 ft-lb/in²  Type "S"; ASTM D 1822
Falling Dart Impact 169 J 125 ft-lb  73F; ASTM D 3029
Taber Abrasion, mg/1000 Cycles 10 10  CS-17, 1 kg; ASTM D 1044
Izod Impact, Notched 6.94 J/cm 13 ft-lb/in  73F; ASTM D 256

Electrical Properties
Volume Resistivity Min 1e+017 ohm-cm Min 1e+017 ohm-cm  ASTM D 257
Dielectric Constant 2.96 2.96  1 MHz; ASTM D 150
Dielectric Constant 3.17 3.17  60 Hz; ASTM D 150
Dielectric Strength 15 kV/mm 380 V/mil  in air, 125 mils; ASTM D 149
Dissipation Factor 0.0009 0.0009  60 Hz; ASTM D 150
Dissipation Factor 0.01 0.01  1 MHz; ASTM D 150
Comparative Tracking Index 250 - 400 V 250 - 400 V  (+/- 0.125 inch); PLC Code 2; UL 746A
Hot Wire Ignition, HWI 30 - 60 sec 30 - 60 sec  (+/- 0.125 inch); PLC Code 2; UL 746A
High Amp Arc Ignition, HAI 60 - 120 arcs 60 - 120 arcs  Surface (+/- 0.125 inch); PLC Code 1; UL 746A
High Voltage Arc-Tracking Rate, HVTR 25.4 - 80 mm/min 1 - 3.15 in/min  (+/- 0.125 inch); PLC Code 2; UL 746A

Thermal Properties
CTE, linear 68°F 68.4 µm/m-°C 38 µin/in-°F  Flow, -40F to 200F; ASTM E 831
Heat Capacity 1.26 J/g-°C 0.3 BTU/lb-°F  ASTM C 351
Thermal Conductivity 0.25 W/m-K 1.74 BTU-in/hr-ft²-°F  ASTM C 177
Deflection Temperature at 0.46 MPa (66 psi) 138 °C 280 °F  0.250 inch, unannealed; ASTM D 648
Deflection Temperature at 1.8 MPa (264 psi) 129 °C 265 °F  0.250 inch, unannealed; ASTM D 648
Vicat Softening Point 154 °C 310 °F  Rate B; ASTM D 1525
UL RTI, Electrical 130 °C 266 °F  UL 746B
UL RTI, Mechanical with Impact 130 °C 266 °F  UL 746B
UL RTI, Mechanical without Impact 130 °C 266 °F  UL 746B
Flammability, UL94 HB HB  Tested Thickness = 0.028 in.

Optical Properties
Refractive Index 1.586 1.586  ASTM D 542
Haze 1 % 1 %  0.100 inch; ASTM D 1003
Transmission, Visible 88 % 88 %  0.100 inch; ASTM D 1003

Descriptive Properties
Radiant Panel Listing UL tested  
UL File Number, USA E121562  
UV-light, water exposure/immersion F2  UL746C