FR-4 Epoxy Glass Cloth Laminated Sheet

Properties

Unit

Value

Flexural Strength perpendicular to laminations

A: under normal conditions

Mpa

≥340

E-1/15：150±5℃

-

Impact Strength parallel to laminations (Charpy) 

KJ/m2

≥33

Insulation Resistance after immersion in water (D-24/23)

Ω

≥5.0×108

Dielectric strength perpendicular to laminations
(in 90±2℃ transformer oil, 1 mm in thickness)

MV/m

≥14.2

Breakdown voltage parallel to laminations
(in 90±2℃ transformer oil)

KV

≥35

Permittivity (50Hz)

-

≤5.5

Permittivity (1MHz) 

-

≤5.5

Dissipation Factor (50Hz) 

-

≤0.04

Dissipation Factor (1MHz) 

-

≤0.04

Water Absorption (D-24/23, 1.6mm in thickness)

mg

≤19

Density

g/cm3

1.85

Flammability

-

94V-0

Color

-

Green