FR4 epoxy fiberglass sheet is consisted of reinforcing insulation material---fiberglass mixed with thermoset resin. And then multilayer plates are processed by hot press.

No.	Projects		Unit	FR4 Result	G10 Result
1	Flexural strength perpendicular to lamination	A	Mpa	494	494
		B		473	473
2	Impact strength parallel to laminations (Charpy)	A	KJ/m2	66.7	66.7
		B		45.3	45.3
3	laminations (Charpy)                  Dielectric strength perpendicular to laminations (in 90±2°Ctransformer oil,1mm in thickness)		MV/m	10.7	10.7
4	Breakdown voltage parallel to laminations (in 90±2°C transformer oil)		KV	54.6	54.6
5	Insulation resistance after impregnated in water	A	Ω	1.5*1013	1.5*1013
		B		1.7*1013	1.7*1013
6	Dissipation factor		/	3.3*10-2	3.3*10-2
7	Dielectric constant (1MHz)		/	5.14	5.14
8	Water absorption		mg	6.5	6.5
9	Combustibility		class	V-0	HB
10	Adhesive strength		N	5221	5221

About us  

Our company is located in the superior environment of Zhe Jiang Shangyu district. The company was founded in 2002 with more than 10 years of insulation materials production experience. The company has advanced production equipment including 2400 tons of vacuum press, fully automatic production lines, two vertical gluing machine, the professional research and development personnel to ensure the quality of the products. With our core value idea"people oriented, reputation first" , Jingjing products occupy a large portion of Chinese market, and also are exported to overseas countries at present with a good reputation and high quality!