Specifications

low water absorption
-high mechanical strength,thermal resistant
-good electric property

Name:	epoxy glass fiber sheet
Model NO:	FR-4
Base Material:	Glass fibre + epoxy resin
Density:	2
Item:	Testing method	Unit	Result
Fire Retardancy Grade:	A	--	94-V0
Flame Resistance:	C-96/20/65	°C	170-180
Voltage Resistance(penetrating)	C-96/20/65 (in 25 °C oil)	KV/mm	18
Voltage Resistance	C-96/20/65 (in 25 °C oil)	KV/mm	12
Arc Resistance	C-96/20/65	S	60-80
Permittivity(1MHZ):	C-96/20/65	--	4.0-5.0
Permittivity(1MHZ):	C-96/20/65 +D-48/50	--	4.5-5.5
Volume resistivity:	C-96/20/65  +C-96/40/95	Ω-cm	5*10^11-10^13
Surface resitance:	C-96/20/65 +C-96/40/90	Ω	5*10^11-10^12
Insulation Resistance:	C-96/20/65 +D-2/100	Ω	10^12-10^13
Conmpressive Strength(Vertical):	A	kg/mm2	29-34
Conmpressive Strength(Horizontal):	A	kg/mm2	19-24
Anti-impact intensity(Parrallellable):	A	kg-cm/cm2	7-9
Bending strength(Horizontal):	A	kg/mm2	40-50
Clevability:	A	kg	850-1000
Adhesive strength:	A	kg	700-900
Compressive strength(Horizontal):	A	kg/mm2	20-24
Water absorption rate:	E-24/50 +D-24/23	%	0.07-0.12