fr4 pcb material properties

The classification of FR-4 PCB Materials and what are characteristic parameters of FR4?

fr4 high temperature pcb electronics factory

The classification of FR-4 PCB Materials and what are characteristic parameters of FR4?

FR-4 classification:

The surface colors of FR-4 epoxy glass cloth laminate are include:

Yellow FR-4, white FR-4, black FR-4, blue FR-4, etc.

FR-4 is a type of sheet and used for PCB as the substrate. According to the different of reinforcement materials, the FR4 sheets are mainly classified into the following four types:

FR-4: glass cloth substrate
FR-1, FR-2, etc.: paper substrate
CEM series: composite substrate
Special material substrate (ceramic, metal base, etc.)

FR-4 is a laminate board that obtained by immersing epoxy resin with alkali-free glass fiber cloth by pressing under high-temperature and high-pressure,it’s rigid insulating laminated sheet.

Features and Uses

Features: High mechanical and dielectric properties, good heat and moisture resistance and good machinability.

Uses: Insulation structural parts in motors and electrical equipment, including various types of switches FPC reinforced, electrical insulating carbon film printed circuit boards, computer drilling mat mold fixtures (PCB test racks) and in humid environmental conditions and Used in transformer oil.

Basic characteristics:

No.	Test Item	Test condition	Unit	Standard Value	Testing Result
1	Density	ISO 1183	g/cm3	≥1.70	1.85
2	Moisture Absorption (0.125”)	ASTM D-570	%	0.15 max	0.10
3	Breakdown Voltage	Condition A (0.062”) Condition D-48/50	ASTM D-149 kV	45 min 40 min	66 65
4	Permittivity @ 1 MHz	Condition A (0.062'') Condition D-48/50	ASTM D-150	5.2 max 5.4 max	4.4 4.5
5	IZOD Strength (0.062”)	Length-Wise Cross-Wise	ASTM D-229 ft-lb/in Notched	7.0 min 5.5 min	13 12
6	Flexural Strength (0.062”)	Length-Wise Cross-Wise	ASTM D-790 ksi (MPa)	60.0 (414) min 50.0 (345) min	80 (552) 70 (483)
7	Flexural Modulus (0.062”)	Length-Wise Cross-Wise	ksi (GPa)		2,900 (20) 2,600 (18)
8	Tensile Strength (0.125”)	Length-Wise	ASTM D-638 ksi (MPa)		62 (430)
9	Compressive Strength, Flat-Wise (0.500”)	ASTM D-695	ksi (MPa)		66 (455)
10	Bonding Strength (0.500”)	Length-Wise Cross-Wise	ASTM D-229 Lb (kg)	2000 (907) min 1600 (725) min	2,500 (1,133) 1,900 (862)
11	Shear Strength (punch type, 0.062”)	ASTM D-732	psi (MPa)		21,500 (148)
12	Temperature Index	ASTM D-2304	℃		130
13	Coefficient of Thermal Expansion	ASTM E-228	'/''℃x10-6		15
14	Flammability Rating	UL94	Class	V-I	V-0
15	Dissipation Factor @ 1 MHz	Condition A (0.062”) Condition D-48/50	ASTM D-150	0.025 max 0.035 max	0.014 0.015
16	Dielectric Strength (Condition A)	ASTM D-149	V/mil		635
17	Arc Resistance (0.125”)	ASTM D-495	Sec		140
18	Comparative Tracking Index (0.125”)	ASTM D-3638*	V		230

Process characteristics:

FR-4 process platen melting point (203 ℃)
High resistance
Low loss factor (Df 0.0025)
Stable and low dielectric constant (Dk 2.35)
Thermoplastic materials

What is FR-4?

FR-4 is a code name of a flame-resistant material grade. It means a material specification that the resin material must be self-extinguishing after being burned. It is not a material name, but a material grade, so the current general circuit is used by many types of FR-4 grades,but most of them are made of Tera-Function epoxy with filler and glass fiber.

FR-4 Epoxy Glass Cloth Laminate,according to the industry applications,also known as FR-4 Epoxy Glass Cloth,Insulation Board,Epoxy resin Board, Brominated Epoxy Board, FR-4 , fiberglass board, FR-4 reinforcing board, FPC reinforcing board, flexible circuit reinforcing board, FR-4 epoxy board, flame retardant insulation board, FR-4 laminated board, epoxy board , FR-4 light board, FR-4 glass fiber board, epoxy glass cloth board, circuit board drilling pad.

Main technical features and applications:

Electrical insulation Stable, good flatness,smooth surface,standard thickness tolerance.

Suitable for high-performance electronic i