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Epoxy Glass Cloth Lamiates (3240/FR-4)

Description:

Epoxy glass cloth laminates are made from hot press of impregnated glass fabric with Epoxy resin. They are mainly used as insulation part and structure parts in generator, motor and some other electrical equipments.

Properties:

No	Items	Units	Standard
No	Items	Units	3240	FR4 /G10	3240-1
1	Flexural strength perpendicular to laminations – under normal room temperature	MPa	≥340	≥350	≥320
2	Notch Impact strength parallel to lamination (Notched charpy)	KJ/m2	≥33	≥37	≥30
3	Dielectric strength perpendicular to lamination (in oil 90±2℃) 1mm in thickness	MV/m	≥14.2	≥14.2	≥8.0
4	Breakdown voltage parallel to lamination (in oil 90±2℃)	KV	≥35	≥45	≥30
5	Water absorption, 1.6mm in thickness	mg	≤19	≤19	≤19
6	Insulation resistance impregnated in water, D-24/23	Ω	≥5.0×10⁸	≥5.0×10⁸	≥1.0×10⁸
7	Density	g/cm3	1.70-1.90	1.70-1.90	1.8-2.0
8	Dissipation factor (50Hz)		≤0.04	≤0.04	---

Note:

The properties of FR-4 are mainly the same as those of G10, except that FR-4 is fire retardant

3240-1 is the economical substitute of 3240