G10/FR4 Fiberglass Sheets - High Strength Laminate Supplier

FR4 Fiberglass Sheets

FR4 fiberglass sheets combine woven fiberglass cloth with epoxy resin to create high-strength laminates with self-extinguishing properties. Designated as Flame Retardant level 4, these sheets meet National Electrical Manufacturers Association (NEMA) grade FR4 standards and are equivalent to G10 with added flame-retardant additives.

The woven fiberglass and epoxy matrix delivers exceptional strength-to-weight ratio and dimensional stability. With flexural strength exceeding 55,000 psi lengthwise and compressive strength up to 60,000 psi flatwise, the material maintains structural integrity while providing excellent electrical insulation. The sheets resist moisture, corrosion, and chemicals, operating continuously at temperatures up to 285°F with Underwriters Laboratories (UL) 94 V-0 flame rating.

Standard FR4 sheets serve as substrates for Printed Circuit Boards (PCBs) and electrical insulators, while high-performance variants offer enhanced thermal stability for demanding applications. Available thicknesses range from 0.5mm to 50mm with smooth gloss or matte finishes. Key specifications include specific gravity of 1.82-1.85, water absorption below 0.25% per 24 hours, and dielectric strength above 50 kV.

FR4 sheets machine easily with Computer Numerical Control (CNC) routers, waterjets, and lasers. Standard sizes include 1020mm x 1220mm and 1220mm x 2440mm, with custom dimensions available up to 60 x 120 inches. Manufacturers offer precision machining, cutting, and finishing services to meet specific application requirements.

Trusted FR4 Fiberglass Wholesaler: RaxPanel’s Quality Commitment

RaxPanel is a professional manufacturer of high-quality electrical insulation materials with over 20+ years of manufacturing experience. Our FR4 Fiberglass Sheets are composite laminates formed by electronic grade fiberglass cloth impregnated with epoxy resin under high temperature and pressure.

These sheets exhibit:

Excellent mechanical strength
Good dielectric properties
Flame retardant performance
High dimensional stability
Superior adhesive properties
Excellent chemical resistance

Available in thicknesses from 0.5mm to 50mm with polished or matte surfaces.

As a direct manufacturer based in Hebei, China, we maintain in-house R&D and production capabilities with a daily output of 1500+ m². Our ISO-certified processes ensure consistent quality for clients across 30+ countries. We provide rapid, cost-effective solutions tailored to your project requirements.

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Data Sheet
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Parameter Category	Parameter	Value	Unit
General Properties	Material Designation	FR4 / G10	–
	Resin Matrix	Epoxy	–
	Color	Natural / Aqua Green	–
	Surface Finish	Smooth Gloss, Smooth Matte	–
Physical Properties	Specific Gravity	1.82 – 1.85	–
	Water Absorption	< 0.25	% (24 hrs)
	Rockwell Hardness	M110	–
	Coefficient of Thermal Expansion	0.9	10⁻⁵ cm/cm/°C
	Thermal Conductivity (Through-Plane)	0.29	W/(m·K)
Mechanical Properties	Flexural Strength, Lengthwise	> 55,000	psi
	Flexural Strength, Crosswise	> 45,000	psi
	Compressive Strength, Flatwise	60,000	psi
	Tensile Strength, Lengthwise	40,000	psi
	Tensile Strength, Crosswise	35,000	psi
	Shear Strength	19,000	psi
	IZOD Impact, Flatwise	7	ft-lbs/in
	IZOD Impact, Edgewise	5.5	ft-lbs/in
Electrical Properties	Dielectric Strength	> 50	kV
	Permittivity (Dielectric Constant)	4.8	–
	Dissipation Factor	0.017 – 0.018	–
	Volume Resistivity	10¹⁶	Ω·cm
Thermal & Safety	Max Operating Temperature	285	°F
	Flame Resistance	94V-0	UL Rating
Standard Sizes	Sheet Size (Standard)	1020 x 1220, 1220 x 2440	mm
	Thickness Range	0.5 – 50	mm

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Frequently Asked Questions

What are FR4 Fiberglass Sheets made of?

FR4 Fiberglass Sheets are composed of a woven fiberglass cloth impregnated with an epoxy resin binder. This combination provides exceptional mechanical strength, electrical insulation properties, and flame retardancy (UL 94 V-0).

What are the key benefits of using FR4 Fiberglass Sheets?

FR4 sheets offer unmatched durability, excellent electrical insulation, thermal resistance, flame retardancy, and versatility. They are also moisture-resistant, chemically resistant, and can be easily machined for custom applications.

What applications are FR4 Fiberglass Sheets commonly used for?

FR4 sheets are widely used in printed circuit boards (PCBs), electrical insulation components, mechanical parts, automotive accessories, aerospace components, industrial equipment, and consumer electronics due to their strength and reliability.

Are FR4 sheets flame retardant?

Yes, FR4 sheets are flame retardant and meet the UL 94 V-0 standard, meaning they are self-extinguishing and provide enhanced safety in applications where fire resistance is critical.

Can FR4 Fiberglass Sheets be customized?

Yes, FR4 sheets can be customized in terms of thickness, size, fiber selection, surface finish, and machining. Options include CNC cutting, drilling, painting, and bonding to meet specific project requirements.

What is the maximum operating temperature for FR4 sheets?

FR4 Fiberglass Sheets can withstand temperatures up to 285°F (approximately 140°C), making them suitable for high-temperature environments and applications requiring thermal stability.

How do I choose the right thickness and size for my project?

Select thickness and size based on your application’s mechanical, electrical, and thermal requirements. Common thicknesses range from 0.5mm to 50mm, and standard sheet sizes include 1020x1220mm and 1220x2440mm, with customization available.

What are the typical lead times for large OEM orders requiring deep customization?

As a direct manufacturer with over 20 years of experience and a daily output of 1500+ m², we prioritize supply chain stability and reliability for our OEM partners. Our in-house R&D and production capabilities in Hebei, China, allow us to efficiently manage large, custom orders. While lead times can vary based on the complexity and volume of the specific customization, our streamlined manufacturing process is designed to meet demanding production schedules without compromising on the consistent quality and precise specifications required for integration into your final products.

Do you offer pricing incentives or support programs for distributors and wholesalers?

Yes, we provide favorable pricing and policies for our channel partners who buy in bulk. Our model as a direct manufacturer enables us to offer competitive bulk pricing structures that support high profit margins and good inventory turnover. We focus on building long-term relationships to ensure a reliable supply of high-quality FR4 sheets, facilitating smoother operations for our distributors and helping them satisfy market demand effectively.

Can you provide technical data sheets and performance test reports for specifiers and engineers?

Absolutely. We supply detailed technical data sheets (TDS) that include comprehensive information on mechanical properties, thermal resistance, electrical insulation, and other critical performance metrics. Our materials undergo rigorous testing for thermal stability, electrical insulation, and mechanical strength. These test reports and certifications are available to ensure the FR4 sheets meet all necessary industry standards and regulations, providing the technical assurance required for specification in project blueprints and designs.