Item  Test method ASTM 
Test conditions  Unit  Glass epoxy FR4 


Properties  Specific gravity  D792      1.80  
Water absorption rate  D570  E24/50 +D24/23 
  0.10  
Electrical properties  Withstand voltage  Normal temperature  D149  D240/24 Short interval method 
MV/m  29 
After immersion in water  34  
Edgewise withstand voltage  Normal temperature  D149  Short interval method  MV/m  6.6  
Volume resistance  D257    Ω･m  10^{11}  
Surface resistance  D257    Ω  10^{13}  
Insulation resistance  Normal temperature  D257  D2/100  Ω  1.0×10^{13} 1.0×10^{12} 

After boiling  
Permittivity  D150  3GHz    4.6  
Dissipation factor  D150  3GHz    0.050  
Arc resistance  D495    sec.  120  
Tracking resistance  IEC 112    V(CTI)  350  
Type of electric insulation  IEC      F  
Thermal properties  Thermal conductivity  C177    W/(m･K)    
Thermal linear expansion coeffi cient 
Vertical Side 
D696  25100℃  10^{5}/℃  2.1  
Flammability  UL94      V0  
Solder resistance  UTK method    ℃/sec.  260×120  
Deflection temperature under load  D648  1.82MPa  ℃  180  
Mechanical properties  Tensile hardness  Vertical Side 
D638  Breaking  MPa  300 
270  
Tensile elongation  Vertical Side 
D638    ％  3.0  
Bending strength  Vertical Side 
D790  Breaking  MPa  720  
540  
Bending deformation rate  Vertical Side 
D790    ％  4.1  
3.8  
Bending modulus of elasticity  Vertical Side 
D790    GPa  24.3  
20.0  
Shear strength  D732    MPa    
Izod impact strength  D256  With notch  J/m  588  
Rockwell hardness  D785  R scale    120 
Item  Test method  Treatment conditions  Unit  Glass epoxy CEM3 


Specific gravity  JIS K 6911  A    1.51.7  
Water absorption rate  JIS C 6489  E24/50  ％  0.25  
+D24/23  
Flatwise withstand voltage  JIS K 6911  C90/20/65  kV/mm  1830  
Edgewise withstand voltage  JIS K 6911  O0.5/90  kV    
Insulation resistance  Normal state    C90/20/65  Ω  1×10^{13}to1×10^{14} 
After boiling    D2/100  Ω  1×10^{12}to1×10^{13}  
Permittivity(1MHz)  Normal state    C90/20/65    4.24.7 
After water absorption    C90/20/65    4.44.9  
  +D48/50  
Dissipation factor(1MHz)  Normal state    C90/20/65    0.0180.023 
After water absorption    C90/20/65    0.0220.025  
  +D48/50  
Bending strength    A  N/mm  300450  
Compression strength  Perpendicular to layer    A  N/mm   
Parallel to layer    A  N/mm    
Izod impact strength(Parallel to layer)    A  J/cm    
Cleavage strength    A  kN    
Heat resistance    A    150℃ 120 mins. No problems 

Acetone resistance    A    Boiling 30 mins. No problems 

Heat resistance(UL94)    A    V0  
Correct punching temperature    A  ℃  1560 
Item  Unit  Glass epoxy CEM3 


Temperature rating  Electrical  ℃  130  
Mechanical  ℃  140  
Flammability    94V0  
Hot wire ignitability  secs.  120^{+}  
Highcurrent arc ignitability  Times  200^{+}  
Highvoltage arc tracking  in/mins.  0  
Tracking resistance    230 