Views: 264 Author: Weishi Sheets Publish Time: 2026-08-20 Origin: Site
Content Menu
● How to Evaluate an FR4 Fiberglass Sheet Manufacturer
>> 1. Material Grade Transparency
>> 2. Manufacturing and R&D Capability
>> 4. Certification and Compliance Documentation
>> 5. Delivery Stability and Communication
● Top 10 FR4 Fiberglass Sheet Manufacturers in China
>> 1. Guangdong Weishi New Materials Co., Ltd.
>>> Core Strengths
>>> OEM and Customization Scope
>>> Recommended Buyer Verification
>> 2. Hebei JingHong Electronic Technology Co., Ltd.
>>> Core Strengths
>>> OEM and Customization Scope
>> 3. Hangzhou Liansheng Insulation Co., Ltd.
>>> Core Strengths
>>> OEM and Customization Scope
>> 4. Shenzhen Xiongyihua Plastic Insulation Ltd.
>>> Core Strengths
>>> OEM and Customization Scope
>> 5. Suzhou Wanrun Insulation Material Co., Ltd.
>>> Core Strengths
>>> OEM and Customization Scope
>> 6. Anheda Group / AHD Polymer
>>> Core Strengths
>>> OEM and Customization Scope
>>> Core Strengths
>>> OEM and Customization Scope
>> 8. Noves Electronics Co., Ltd.
>>> Core Strengths
>>> OEM and Customization Scope
>> 9. Kunshanshi Honglei Electronics Technology Co., Ltd.
>>> Core Strengths
>>> OEM and Customization Scope
>> 10. Shenyang Youda Trading Import & Export Co., Ltd.
>>> Core Strengths
>>> OEM and Customization Scope
● Common FR4 Fiberglass Sheet Sourcing Risks
>> Material Grade Substitution
>> Inconsistent Thickness Tolerance
>> Uncontrolled Sample-to-Production Changes
● An Overlooked Buyer Tip: Test Across the Sheet, Not Only One Corner
● Buyer's Guide: From RFQ to Mass Production
>> Step 1: Prepare a Clear RFQ
>> Step 2: Request Technical Documents
>> Step 3: Approve a Production-Representative Sample
>> Step 4: Confirm Inspection Standards
>> Step 5: Control the First Production Order
>> Step 6: Build a Long-Term Supply System
>> 1. How can I verify whether a supplier's ISO certificate is still valid?
>> 2. Can G10 be used instead of FR4?
>> 3. What should be included in an FR4 certificate of analysis?
>> 4. Why do FR4 quotations vary significantly between suppliers?
>> 5. Can FR4 fiberglass sheet be CNC machined?
China is one of the world's most important production bases for FR4 fiberglass sheet, G10 sheet, G11 sheet, epoxy glass laminate and related electrical insulation materials. Buyers can source standard panels, high-temperature grades, anti-static boards, copper-clad sheets and CNC-machined insulation components from manufacturers across Guangdong, Zhejiang, Jiangsu, Hebei and other industrial regions.
The country's advantages are not limited to production cost. China has mature supply chains for electronic-grade fiberglass cloth, epoxy resin, lamination equipment, CNC machining, industrial packaging and export logistics. Guangdong provides access to electronics, battery, appliance and precision-machining industries; Zhejiang and Jiangsu offer strong electrical-equipment and composite-material clusters; Hebei has developed large-scale insulation-laminate production capacity.
However, a low quotation alone does not guarantee that a board is genuine FR4. Two sheets may look similar in color and thickness while having very different flame-retardant properties, dielectric strength, glass-cloth content, resin formulation, curing quality and moisture resistance.
For procurement managers, the goal is to find a manufacturer that can consistently meet the agreed technical specification, provide traceable documentation, support reliable delivery schedules and respond effectively when drawings, materials or order quantities change.
A qualified FR4 fiberglass sheet supplier should be evaluated through more than catalogs and product photos. The following criteria provide a practical framework for supplier comparison.
The supplier should clearly distinguish between FR4, G10, G11, FR5, 3240 epoxy sheet and other laminate grades.
FR4 is generally selected for applications requiring flame-retardant epoxy glass laminate properties. G10 may offer strong mechanical performance but should not automatically be treated as a direct substitute for FR4 when a flame-retardant requirement applies. G11 and FR5 are often considered where higher thermal performance is needed.
Ask each supplier to confirm:
- Exact material grade
- Resin system
- Glass-cloth type
- Flame-retardant classification
- Standard and custom thicknesses
- Operating temperature range
- Dielectric strength
- Water absorption
- Flexural strength
- Density
- Surface finish and color options
A supplier with in-house lamination, curing, cutting and machining capabilities generally provides better control over product consistency than a company that only purchases and resells boards.
For customized projects, evaluate whether the factory can support:
- Cut-to-size panels
- CNC routing
- Drilling
- Punching
- Milling
- Chamfering
- Surface finishing
- Tight-tolerance components
- Custom colors
- Anti-static performance requirements
- Drawing-based insulation parts
A dependable manufacturer should be able to explain how it controls incoming fiberglass cloth and resin, lamination pressure, curing conditions, thickness tolerance, flatness, appearance and finished-product inspection.
For critical applications, buyers should request:
- Technical data sheet
- Certificate of analysis
- Batch number
- Thickness inspection record
- Flame-retardant test report
- Electrical-property test report
- Material sample from the intended production grade
- First-article inspection report for custom-machined parts
ISO management-system certificates, RoHS declarations, REACH declarations, UL-related documents and third-party test reports can be useful, but buyers should verify their validity independently.
A certificate should match:
- Legal company name
- Manufacturing address
- Certificate scope
- Product category
- Issuing body
- Expiry date
- Certificate number
For industrial sourcing, delivery reliability is often more valuable than a small difference in unit price. A supplier should provide realistic production lead times, confirm raw-material availability and communicate quickly when technical or scheduling issues arise.
Small and mid-sized buyers should also assess whether the supplier is willing to support sample orders, mixed specifications and customized processing rather than requiring only high-volume standard-sheet purchases.
The following companies represent a practical sourcing shortlist for buyers of FR4 fiberglass sheet, G10, G11 and related epoxy insulation materials. This is not an audited market-share ranking. Buyers should conduct supplier due diligence, sample testing and document verification before placing a production order.
| Manufacturer | Location | Product Focus | Manufacturing / Supply Focus | MOQ Suitability | Certification and Documentation Approach |
|---|---|---|---|---|---|
| Guangdong Weishi New Materials Co., Ltd. | Heyuan, Guangdong | FR4, G10, G11, FR5, 3240, anti-static and copper-clad boards | Flexible sheet supply and custom processing | Suitable for samples, customized projects and ongoing OEM supply | Request current material and batch documentation |
| Hebei JingHong Electronic Technology Co., Ltd. | Hebei | FR4, G10, 3240, Bakelite and insulation laminates | Large-scale laminated insulation-board production | Better suited to volume orders | Management-system documentation available for review |
| Hangzhou Liansheng Insulation Co., Ltd. | Zhejiang | FR4, G10, G11, GPO-3 and copper-clad laminate | Electrical insulation and composite materials | Suitable for industrial programs | Request current certificate scope and validity |
| Shenzhen Xiongyihua Plastic Insulation Ltd. | Shenzhen, Guangdong | FR4, G10, G11 and engineering plastics | Multi-material supply and CNC processing | Suitable for mixed-material requirements | Confirm product-specific reports before order |
| Suzhou Wanrun Insulation Material Co., Ltd. | Suzhou, Jiangsu | Prepreg, FR4, G10, 3240 and copper-clad materials | Epoxy laminate and prepreg-related supply | Suitable for East China sourcing | Request batch-level technical documents |
| Anheda Group / AHD Polymer | China | FR4, ESD FR4 and engineering plastics | Higher-volume sheet supply | Better suited to volume programs | Confirm compliance requirements by product grade |
| ZTELEC Group | China | FR4, G10, G11 and electrical insulation materials | Electrical insulation portfolio | Suitable for industrial electrical applications | Confirm factory-specific document coverage |
| Noves Electronics Co., Ltd. | China | FR4, G10, G11, ESD Bakelite and plastics | Mixed insulation and engineering-plastic supply | Suitable for consolidated sourcing | Verify test data for exact material ordered |
| Kunshanshi Honglei Electronics Technology Co., Ltd. | Kunshan, Jiangsu | FR4/G10 electrical insulation boards | Electronics, transformer and fixture applications | Suitable for application-based orders | Request inspection standards and samples |
| Shenyang Youda Trading Import & Export Co., Ltd. | Shenyang, Liaoning | Epoxy laminates and electrical insulation boards | Export coordination and OEM supply | Suitable for export-oriented inquiries | Confirm factory ownership and audit access |
Guangdong Weishi New Materials Co., Ltd. is a professional manufacturer focused on high-performance epoxy insulation boards and composite materials. Established in 2007, the company supplies FR4 fiberglass sheet, G10 sheet, G11 sheet, FR5 sheet, 3240 epoxy board, anti-static board, copper-clad board and related processed insulation materials.
The company is a suitable option for buyers seeking a practical combination of product flexibility, engineering communication and customized processing support. Rather than focusing only on standard full-sheet supply, Guangdong Weishi can support applications requiring tailored dimensions, thicknesses, colors, cut-to-size panels and drawing-based insulation components.
Its products are relevant to electronics, electrical equipment, mechanical processing, mold manufacturing, battery-pack insulation, industrial machinery, fixtures and control systems.
- Broad range of epoxy glass laminate products
- Support for FR4, G10, G11, FR5 and anti-static material options
- Flexible response for small and mid-sized OEM customers
- Custom cutting, machining and drawing-based processing support
- Guangdong location with access to the South China electronics and manufacturing supply chain
- Suitable for buyers requiring direct technical discussion before production
- Ability to support long-term supply programs with defined material specifications
Buyers can discuss the following requirements with Guangdong Weishi:
- Custom thickness and sheet size
- Cut-to-size FR4 panels
- CNC-machined insulation components
- Drilled or routed parts
- Anti-static epoxy sheet
- High-voltage insulation applications
- Battery-pack insulation structures
- Color and surface-finish requirements
- Private-label packaging
- Sample approval before mass production
Before confirming an order, buyers should request a technical data sheet for the exact product grade, a sample from the intended material formulation, thickness-tolerance information and batch traceability requirements.
Hebei JingHong Electronic Technology Co., Ltd. is a large-scale producer of electrical insulation laminates. Its product portfolio includes FR4 boards, G10 sheets, 3240 epoxy boards, Bakelite boards, water-green fiberglass boards and phenolic cloth laminates.
The company is suitable for procurement teams that prioritize scale, standardization and broad availability of conventional insulation-board grades. It is especially relevant for high-volume industrial programs requiring regular supply of common laminate specifications.
- Wide selection of epoxy and phenolic insulation laminates
- Focus on standard industrial-grade boards
- Suitable for large-volume requirements
- Capable of supplying FR4, G10, 3240 and related materials
- Appropriate for electrical equipment, fixtures, transformers and industrial insulation uses
- Cut-to-size sheets
- Standard and custom thicknesses
- Palletized bulk shipments
- Export packaging
- Repeat orders based on approved samples
- Custom-machined insulation components
Hangzhou Liansheng Insulation Co., Ltd. supplies FR4 epoxy fiberglass sheet, G10, G11, GPO-3 and copper-clad laminate materials. The company is relevant to buyers in electrical equipment, industrial systems, communication equipment, instrumentation and transportation-related industries.
Its Zhejiang location can be advantageous for buyers sourcing from the Yangtze River Delta manufacturing region.
- Broad electrical insulation material range
- Experience with FR4, G10, G11 and GPO-3
- Suitable for structured industrial procurement programs
- Suitable for electrical and mechanical insulation applications
- Potential fit for customers seeking copper-clad and specialty laminate products
- Custom sizes
- Industrial-grade material selection
- Thickness variation
- Specialized insulation workpieces
- Export packing requirements
- Compliance-document coordination
Shenzhen Xiongyihua Plastic Insulation Ltd. is a supplier of FR4, G10, G11 and a broader range of engineering plastics. Its product range also includes POM, nylon, PTFE, PVC, PE, PU and ABS materials.
This company may suit buyers who prefer to consolidate procurement for fiberglass laminates and engineering-plastic materials through one supplier.
- FR4, G10 and G11 product availability
- Broad engineering-plastic portfolio
- Suitable for mixed-material sourcing
- Potential support for machining and processed parts
- Located in Shenzhen, close to electronics and precision-manufacturing clusters
- CNC routing and drilling
- Custom dimensions
- Machined FR4 components
- Color and thickness selection
- Mixed orders involving FR4 and engineering plastics
- Customized packaging
Suzhou Wanrun Insulation Material Co., Ltd. supplies prepreg, epoxy resin sheet, FR4 board, G10 sheet, 3240 epoxy board and copper-clad laminate products.
Its Suzhou location is useful for buyers sourcing from Jiangsu and Shanghai-area industrial supply chains. The company may be especially relevant for projects involving prepreg, laminated sheet and copper-clad material requirements.
- Product coverage across prepreg and epoxy laminate materials
- Suitable for FR4, G10 and 3240 requirements
- Convenient regional access to East China ports and manufacturing hubs
- Relevant for electrical insulation and copper-clad material programs
- Sheet-size customization
- Thickness requirements
- Prepreg-related discussions
- Export packaging
- Application-specific insulation materials
- Repeat production based on retained samples
Anheda Group, also known through AHD Polymer product lines, supplies FR4 fiberglass sheet, anti-static FR4 and engineering-plastic materials. The company is commonly considered for larger-volume sheet requirements and material programs that combine insulation sheets with other industrial plastics.
- FR4 and anti-static FR4 availability
- Broad engineering-plastic supply range
- Suitable for volume purchasing
- Potential fit for industrial distribution and consolidated procurement
- Relevant for applications requiring anti-static performance
- ESD FR4 requirements
- Custom thicknesses
- Sheet sizing
- Color selection
- Bulk pallet packaging
- Material testing based on application requirements
ZTELEC Group has a long history in electrical insulation materials and offers FR4, G10, G11 and other laminated insulation products. It is a potential candidate for buyers in electrical infrastructure, transformer manufacturing, motors, generators and industrial insulation applications.
- Long-term industry experience
- Product coverage across multiple electrical insulation grades
- Suitable for electrical and power-related projects
- Potential support for conventional and higher-temperature insulation requirements
- Broad electrical-material portfolio
- Application-based material selection
- Custom insulation components
- High-temperature material requirements
- Drawing-based parts
- Batch documentation
- Electrical-insulation assemblies
Noves Electronics Co., Ltd. supplies FR4, G10, G11 fiberglass sheets, ESD Bakelite sheets, acrylic, POM and related industrial sheet materials.
The company may be suitable for buyers that need both insulation laminates and general engineering-plastic sheet products for fixtures, jigs, electrical components and industrial processing.
- Coverage of FR4, G10 and G11
- ESD Bakelite and engineering-plastic options
- Suitable for mixed product sourcing
- Potential fit for fixture, jig and electrical-insulation applications
- Sheet cutting
- Customized dimensions
- ESD material requirements
- Mixed-material purchasing
- Industrial packaging
- Sample-based repeat orders
Kunshanshi Honglei Electronics Technology Co., Ltd. supplies FR4/G10 epoxy glass-fiber sheet for electrical insulation and electronics-related applications. The company is relevant to buyers of transformer insulation, PCB-processing materials, industrial fixtures and mechanical electrical components.
- Focus on FR4/G10 insulation applications
- Suitable for electronics and transformer-related demand
- Potential fit for PCB drilling pads and electrical fixtures
- Jiangsu location within an established manufacturing region
- Drilled panels
- Routed insulation components
- Custom thicknesses
- Fixture-board processing
- Application-specific sheet dimensions
- First-article inspection for custom parts
Shenyang Youda Trading Import & Export Co., Ltd. offers epoxy laminated sheets and related electrical insulation materials with OEM-oriented export support.
For buyers considering this supplier, it is important to clarify whether the quoted products are manufactured in a company-controlled factory or sourced through partner facilities. This distinction affects audit access, production traceability and quality-control responsibility.
- Export-oriented communication support
- OEM project capability
- Electrical insulation material coverage
- Potential fit for buyers requiring consolidated export coordination
- Export packaging
- Product labeling
- Sheet cutting
- Customized order coordination
- Documentation support
- Multi-item electrical insulation shipments
A common procurement risk is receiving a lower-cost epoxy sheet that is visually similar to FR4 but does not meet the agreed flame-retardant, electrical or thermal performance requirements.
A supplier may quote a "green epoxy board" or "fiberglass laminate" without defining the resin system, glass-cloth grade, flame rating or test standard. This can result in material that performs acceptably during basic machining but fails under humidity, elevated temperature, voltage stress or flame exposure.
To reduce this risk, define the full material requirement in the purchase order rather than writing only "FR4 sheet."
Thicker sheets may have more noticeable variation in thickness, flatness and internal resin distribution. If the sheet will be machined into precision electrical parts, even a small thickness deviation may affect assembly performance.
Buyers should specify:
- Nominal thickness
- Permitted thickness tolerance
- Flatness requirement
- Length and width tolerance
- Finished-part tolerance after machining
A supplier may show an ISO certificate that is expired, issued to another company entity or applicable only to a trading office rather than the actual factory.
Always verify the document before approving the supplier. For regulated industries, require the document to be included in the supplier-approval file.
A sample may be made from a higher-grade material than the material used later in bulk production. This can happen when the sample process is not linked to a batch specification.
The solution is to approve a "golden sample" and attach the agreed material specification, test requirements and inspection criteria to the purchase order.
FR4 sheets may suffer edge damage, scratches, moisture exposure or warping if packed poorly for sea freight. Buyers should specify pallet requirements, moisture-resistant wrapping, corner protection, clear labels and maximum pallet weight.
A useful but often overlooked practice is to test material from more than one area of the same production batch.
For thicker or larger-format FR4 sheets, a test sample cut only from one corner may not fully represent the consistency of the entire panel. For demanding applications, request samples taken from different locations within the sheet or from different positions in the production batch.
This approach can reveal potential variation in:
- Resin distribution
- Glass-cloth impregnation
- Thickness
- Flatness
- Internal voids
- Machining behavior
- Electrical performance
For critical projects, buyers should retain samples from the first, middle and final portions of a production lot. This creates a more accurate benchmark for future quality comparisons.
A complete RFQ should include:
- Material grade
- Application
- Required dimensions
- Thickness and tolerance
- Color requirement
- Flame-retardant requirement
- Electrical-property requirement
- Operating temperature
- Quantity per order
- Estimated annual quantity
- Required certificates
- Machining drawings
- Packaging requirement
- Destination port or delivery address
Before sampling, request:
- Technical data sheet
- Material declaration
- Relevant test reports
- Current certification copies
- Product photographs
- Standard sheet sizes
- Production lead time
- Packing method
- Quotation validity
The sample should come from the same material formulation and production route intended for the bulk order. It should not be a generic display sample.
For custom-machined parts, provide a 2D or 3D drawing and request a first-article sample before mass production.
The purchase order should define:
- Material grade
- Thickness tolerance
- Dimensional tolerance
- Surface requirements
- Color
- Test requirements
- Quantity
- Packaging
- Labeling
- Inspection method
- Nonconformance process
For the first mass-production order, request:
- Pre-shipment photos
- Packing photos
- Batch number
- Inspection report
- Certificate of analysis
- Sample retention
- Shipment documents
Once a supplier has successfully completed sample approval and initial production, maintain a documented supplier file. Record approved specifications, past inspection results, delivery performance, communication quality and any corrective actions.
This process reduces the risk of material substitution and makes future repeat orders more efficient.
China provides a broad range of FR4 fiberglass sheet manufacturers for industrial buyers, from large-volume laminate producers to flexible factories specializing in customized insulation components. The right supplier depends on more than quoted price. Material transparency, stable production, document verification, sample consistency, machining capability and delivery reliability should all be part of the selection process.
For buyers seeking FR4, G10, G11, anti-static epoxy sheet or custom-machined insulation components, Guangdong Weishi New Materials Co., Ltd. represents a balanced option for projects that require responsive communication, flexible order support, customized OEM processing and stable long-term material supply.
Request the complete certificate and check the legal company name, factory address, certificate number, issuing organization, scope and expiry date. Then verify the certificate through the issuing organization's official channels. Confirm that the certificate applies to the manufacturing site and relevant product scope.
It depends on the application. G10 and FR4 are both epoxy glass laminates, but FR4 is generally selected where flame-retardant performance is required. If your drawing, customer specification or safety requirement calls for FR4, do not substitute G10 without technical approval.
A useful certificate of analysis should include product grade, batch number, dimensions, thickness, density where relevant, inspection date, test results and applicable test methods. For critical applications, request electrical, mechanical and flame-retardant performance data.
Price differences may result from resin formulation, glass-cloth grade, material density, flame-retardant system, thickness tolerance, curing process, sheet size, inspection standard, packaging and order quantity. Compare technical specifications carefully before comparing prices.
Yes. FR4 can be cut, drilled, routed and milled into electrical insulation components, test fixtures, transformer parts, battery-pack spacers and industrial mechanical parts. The buyer should provide accurate drawings, tolerance requirements, burr limits and inspection criteria before production.
1.[Guangdong Weishi New Materials Co., Ltd.] [wsepoxysheet]
2.[Guangdong Weishi New Materials Company Overview] [gdwsxcl]
3.[China Fiberglass Market Size and Outlook] [grandviewresearch]
4.[China Fiberglass Market Research] [marketsandmarkets]
5.[Hebei JingHong FR4 Glass Epoxy Sheet Information] [jhd-material]
6.[Hangzhou Liansheng Insulation Company Information] [lesonccl.goldsupplier]
7.[Shenzhen Xiongyihua FR4/G10 Product Information] [xyhplastic]
8.[China FR4 Laminate Sheet Manufacturer Directory] [made-in-china]
