Overview
FR4 (EPGC 201 per IEC 60893) is a flame-retardant epoxy glass laminate — the most widely used electrical insulation material worldwide. Woven glass fabric impregnated with epoxy resin, achieving UL 94 V-0 flame retardancy.
Used in: printed circuit boards (PCBs), electrical insulation panels, switchgear components and structural parts requiring both mechanical strength and electrical insulation.
Also known as: NEMA FR4, IEC 60893 EPGC 201, DIN 7735 Hgw 2372, ISOVAL® FR4 (Isovolta), VOLTADUR® FR4 (Isovolta).
For non-flame-retardant version with identical mechanical properties, see G10 (EPGC 202). For higher temperature applications (up to 180°C), see G11 (EPGC 308).
⚠️ Technical data are typical values. Always verify with the manufacturer for critical applications.
Grade-specific information
Available supplier grades
Each record below names the supplied grade, source and scope. Certifications, approvals, colours and forms apply only where stated for that specific grade.
ISOVAL® FR4
Isovolta Group
Confirm with quotation
Flame-retardant epoxy glass laminate for electrical and electronic insulation where low moisture absorption and high physical strength are required.
- Product form
- Sheet
- Thicknesses / diameters
- 0.2–101.6 mm
- Formats / dimensions
- 2800 × 1220 mm; 3180 × 1220 mm
- Colour
- Light green
- Surface / structure
- Glass-fabric epoxy laminate
Key technical data
- Density: approx. 2.0 g/cm³ (ISO 1183/A)
- Flexural strength: 340 MPa at 23 °C (ISO 178)
- Tensile strength: 220 MPa (ISO 527)
- Thermal endurance: TI 130 (IEC 60216)
- Flammability: UL 94 V-0 at ≥0.5 mm
Technical-data source: ISOVAL FR4 technical datasheet (Isovolta Group, 2013)
VOLTADUR® FR4
Isovolta Group
Confirm with quotation
FR4 grade for mechanical, electrical and electronic applications that require high mechanical strength at moderate temperature and flame behaviour defined by thickness.
- Product form
- Sheet
- Thicknesses / diameters
- 0.2–101.6 mm
- Formats / dimensions
- 2800 × 1220 mm; 3180 × 1220 mm
- Colour
- Light green
- Surface / structure
- Glass-fabric epoxy laminate
Key technical data
- Density: approx. 2.0 g/cm³ (ISO 1183/A)
- Flexural strength: 450 MPa at 23 °C (ISO 178)
- Tensile strength: 320 MPa (ISO 527)
- CTI: 200 (IEC 112)
- Flammability: UL 94 V-1 at 0.79–3.9 mm; V-0 at >4 mm
Technical-data source: VOLTADUR FR4 technical datasheet (Isovolta Group, 2014)
Grade data is taken from the named manufacturer source. Current MaterialCut supply, final dimensions and commercial conditions are confirmed in the quotation.
Technical Properties
Generic material-family guidance. Use the named supplier-grade records above for product-specific source, dimensions, colours and technical data.
| Property |
Value |
Unit |
| Density |
1.85 |
g/cm³ |
| Tensile Strength (Yield) |
300 |
MPa |
| Tensile Modulus (E) |
22000 |
MPa |
| Flexural Strength |
400 |
MPa |
| Flexural Modulus |
22000 |
MPa |
| Service Temp. Long-term |
-50 … 130 |
°C |
| Water Absorption |
0.10 |
% |
| Flammability (UL94) |
V-0 |
|
| Volume Resistivity |
10⁹ |
Ω·cm |
| Dielectric Strength |
20 |
kV/mm |
