typical specification for parylene C
  PARYLENE C VALUE  ASTM METHOD
GENERAL  
Density(g/cm) 1.289 D1505
Refractive Index 1.639  
ELECTRICAL  
Dielectric strength
(voltage breakdown)
Volts/mil
5,600 Volts D149
Dielectric constant   D150
60 Hz 3.15  
1 KHz 3.10  
1 MHz 2.95  
Dissipation factor   D150
60 Hz 0.020  
1 KHz 0.019  
1 MHz 0.013  
Dielectric strength
@25 µm, short time
MV/m
220 D149
Dielectric strength
@25 µm, step-by-step
MV/m
185 D149 
Volume resistivity
@ 23°C, 50% RH, ohms
8.8 X 1016   
Surface resistivity
@ 23°C, 50% RH, ohms
1 X 1014 D257
MECHANICAL
Tensile modulus, GPa 3.2 D882
Tensile strength, MPa 70 D882
Tensile strength, psi 10,000 D882 
Yield strength, MPa 5.5  D882
Elongation of break, % 200 D882
Yield elongation, % 2.9 D882
Coefficient of friction-static 0.29 D1894
Coefficient of friction-dynamic 0.29 D1894
Rockwell hardness R80 D785
THERMAL
Melting point, °C 290°C  
Linear coefficient of
expansion(10-5/°C)
3.5 D696
Thermal conductivity @ 25°C
(watts/meter-Kelvin)
0.082 C177 
Specific heat @ 20°C
cal/g°C
0.17 D785
BARRIER
Water absorption, % (24 hr) 0.06 (.029") D570 
Water vapor transmission
@ 37°C (ng)
0.0004 D570
Gas permeability
cc -mil/100 in 2 - 24 hr
   
     N2 0.6  
     O2 5  
     CO2 14  
     H2 110  
Moisture vapor transmission
gm-mil/100 in - 24 hrs
1  


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Typical Specification of Parylene C