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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:
1) FR-4: glass cloth substrate
2) FR-1, FR-2, etc.: paper substrate
3) CEM series: composite substrate

4) 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: 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

Coecient 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:
(1) FR-4 process platen melting point (203 ℃)
(2) High resistance
(3) Low loss factor (Df 0.0025)
(4) Stable and low dielectric constant (Dk 2.35)
(5) 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 insulation requirements, such as FPC reinforcement board, PCB drilling Pad, glass fiber meson, potentiometer carbon film printing fiberglass board, precision star gear (wafer grinding), precision test board, electrical (electrical) equipment insulation struts, insulation pads, transformer insulation board, motor insulation , grinding gears, electronic switch insulation boards, etc.

JY Machinery is a professional manufacturer of CNC Machining for insulating materials. Its main products are:epoxy fiberglass laminated sheet/rod/tubing(FR-4,G-10,3240,FR5,G11),Phenolic laminated(Paper&Cotton) and GPO-3,etc
We have introduced many imported advanced processing equipments and have a scientific management system.All products are in line with SIO9001,SGS and RoHS certification standards. JY Machinery's integrity, strength and product quality have been recognized by the industry. Welcome all friends come to visit, guide and negotiate business. Email: info@jycncmachining.com
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