Views: 255 Author: Weishi Sheets Publish Time: 2026-09-01 Origin: Site
Content Menu
● Why Source Epoxy Sheets from China?
● How to Evaluate an Epoxy Sheet Manufacturer
>> 3. Custom Processing Capability
>> 4. Stable Delivery Performance
● Top 10 Epoxy Sheet Manufacturers in China
>> 1. Guangdong Weishi New Materials Co., Ltd.
>>> Core Advantages
>> 2. Dongguan Yuanfu Insulation Material Co., Ltd.
>>> Core Advantages
>> 3. Fenhar New Material Co., Ltd.
>>> Core Advantages
>>> 4. SIDA Composite Materials
>>> Core Advantages
>>> Core Advantages
>> 6. Hony Engineering Plastics
>>> Core Advantages
>>> Core Advantages
>>> Core Advantages
>> 9. Hitempro
>>> Core Advantages
>> 10. Nantong Baiwei Electric
>>> Core Advantages
● Comparison of Production Focus, MOQ, and Documentation
● Understanding FR4, G10, G11, FR5, and 3240
>> How to Reduce Internal Defect Risk
>> Unclear Certification Claims
● Recommended Sampling Process
>> Step 1: Prepare a Detailed Requirement Sheet
>> Step 2: Request Technical Documents
>> Step 3: Test the Sample in Real Conditions
>> Step 4: Approve a Golden Sample
>> Step 5: Define Pre-Shipment Inspection Requirements
● Packaging and Logistics Considerations
>> 1. How can I verify whether a supplier's ISO certificate has expired?
>> 2. Is all FR4 material flame retardant?
>> 3. What is the difference between G10 and G11 epoxy sheet?
>> 4. Why are quotations for the same FR4 sheet size sometimes very different?
>> 5. What information should be included in an epoxy sheet RFQ?
China has become an important global production base for epoxy fiberglass laminates and electrical insulation composites. Buyers sourcing FR4 sheets, G10 sheets, G11 sheets, FR5 sheets, 3240 epoxy glass cloth laminates, and custom-machined insulation parts can access a wide range of manufacturing capabilities across Guangdong, Jiangsu, Zhejiang, Shandong, and other industrial regions.
For procurement managers, choosing a supplier involves much more than requesting the lowest quotation. A reliable manufacturer should be able to provide stable material properties, consistent thickness control, traceable production batches, technical documentation, professional communication, and dependable delivery performance.
This article introduces ten notable epoxy sheet manufacturers in China and provides a practical purchasing guide for industrial buyers seeking long-term supply partners.
China's composite-material industry benefits from a mature supply chain for fiberglass cloth, epoxy resin systems, insulation materials, CNC machining, electrical components, industrial equipment, and export logistics.
This gives international buyers several advantages:
- Broad availability of FR4, G10, G11, FR5, 3240, antistatic FR4, and related composite grades
- Competitive pricing for standard insulation sheets and converted components
- Flexible support for custom dimensions, sheet thicknesses, colors, and machining requirements
- Access to CNC routing, drilling, milling, die-cutting, and finished insulation-part production
- Strong manufacturing clusters close to electronics, electrical equipment, battery, machinery, and mold industries
- More options for prototype orders, pilot production, and medium-volume OEM programs
Guangdong is especially relevant for buyers serving electronics, electrical equipment, battery-pack assembly, automation systems, industrial machinery, and precision-machining applications. The region combines insulation-material manufacturing with extensive downstream processing resources.
However, buyers should understand that product names alone do not guarantee the same performance. Materials labeled as "FR4," "G10," "G11," or "3240" can differ in resin formulation, fiberglass content, flame-retardant properties, thickness tolerance, thermal resistance, electrical strength, moisture absorption, and machining behavior.
A professional supplier evaluation should consider both product performance and operational reliability.
A capable manufacturer should clearly explain the differences between common grades and recommend materials based on actual application conditions.
Typical material categories include:
- FR4 epoxy fiberglass sheet
- G10 epoxy glass laminate
- G11 epoxy glass laminate
- FR5 high-temperature flame-retardant epoxy laminate
- 3240 epoxy glass cloth laminate
- Antistatic FR4 sheet
- Copper-clad epoxy fiberglass laminate
- Custom epoxy insulation components
A supplier should not simply state that all grades are "high temperature" or "flame retardant." It should provide material-specific technical data, including dielectric strength, flexural strength, water absorption, density, flame-retardant classification, and recommended operating temperature.
Reliable epoxy sheet production depends on control of raw materials, impregnation, lamination pressure, curing temperature, sheet flatness, thickness, and final inspection.
Buyers should ask whether the supplier can provide:
- Incoming raw-material inspection records
- Thickness measurement data
- Density and hardness test results
- Dielectric-strength test reports
- Flexural-strength test reports
- Water-absorption data
- Flame-retardancy documentation
- Production-batch traceability
- Material test certificates or certificates of analysis
Many industrial projects do not require full-size sheets. They require ready-to-install insulation parts with precise dimensions, holes, slots, chamfers, cutouts, and surface requirements.
A capable manufacturer should support services such as:
- Cut-to-size sheet conversion
- CNC milling and routing
- Drilling and countersinking
- Edge finishing and deburring
- Die-cutting
- Engraving and marking
- Custom thickness selection
- Drawing-based production
- Prototype and pilot-order support
Lead time is especially important when epoxy sheets are used in electrical cabinets, battery packs, transformers, motors, industrial machinery, PCB fixtures, and assembly-line equipment.
Buyers should confirm:
- Standard production lead time
- Lead time for custom thicknesses
- Raw-material inventory policy
- Emergency-order options
- Monthly output capacity
- Packaging method
- Export experience
- Quality-claim response process
| Rank | Manufacturer | Main Region | Main Products | Suitable For |
|---|---|---|---|---|
| 1 | Guangdong Weishi New Materials Co., Ltd. | Guangdong | FR4, G10, G11, 3240, antistatic sheets, machined insulation parts | Flexible OEM and customized projects |
| 2 | Dongguan Yuanfu Insulation Material Co., Ltd. | Guangdong | FR4 sheets and custom insulation components | CNC-machined electrical insulation parts |
| 3 | Fenhar New Material Co., Ltd. | Jiangsu | G10, G11, G15, FR4, EPGM laminates | Industrial and high-temperature insulation |
| 4 | SIDA Composite Materials | Zhejiang | FR4, G10, G11, FR5 sheets, rods, and tubes | Multi-grade electrical insulation sourcing |
| 5 | DongX Technology | Guangdong | FR4, FR5, G10, G11 sheets and rods | Electrical and industrial equipment |
| 6 | Hony Engineering Plastics | Guangdong | FR4/G10 machined components | Precision parts and OEM assemblies |
| 7 | BeePlastic | Guangdong | FR4/G10 sheets, rods, and machined parts | Prototypes and custom components |
| 8 | JHD Material | China | High-temperature FR4 and insulation laminates | Heat-sensitive electrical applications |
| 9 | Hitempro | China | CNC-machined FR4/G10 components | Tight-tolerance drawing-based projects |
| 10 | Nantong Baiwei Electric | Jiangsu | Electrical insulation materials | Traditional electrical equipment supply |
Guangdong Weishi New Materials Co., Ltd. is a specialized manufacturer of high-performance epoxy insulation sheets and composite materials. The company focuses on supplying epoxy fiberglass laminates for electronics, electrical equipment, machinery, mold manufacturing, industrial fixtures, battery systems, and high-voltage insulation applications.
Its product range includes FR4 epoxy fiberglass sheets, G10 sheets, G11 sheets, 3240 epoxy glass cloth laminates, antistatic sheets, copper-clad laminate materials, and custom-machined insulation components.
The company is particularly suitable for buyers seeking a balance between product quality, flexible order handling, and customization support. Instead of focusing only on large-volume standard-sheet business, Guangdong Weishi New Materials can support custom sheet dimensions, special thicknesses, application-specific materials, CNC-machined components, drilled panels, routed parts, and drawing-based OEM orders.
- Broad product range covering common electrical-insulation and engineering-composite grades
- Support for FR4, G10, G11, 3240, antistatic, and custom epoxy fiberglass sheet requirements
- Flexible service for small-to-medium-volume OEM projects
- Responsive communication for overseas buyers
- Ability to supply both raw sheets and processed insulation components
- Suitable for custom drawings, non-standard dimensions, holes, cutouts, and CNC-machined parts
- Applicable to high-voltage insulation, battery packs, electronics, machinery, and mold fixtures
- Electrical insulation panels
- Transformer and switchgear components
- Battery-pack insulation barriers
- Electronics fixtures and testing jigs
- PCB drilling and assembly fixtures
- Industrial machinery insulation components
- Mold and tooling parts
- CNC-machined composite parts
- High-voltage electrical equipment
Guangdong Weishi New Materials is a practical option for buyers who need more than a standard FR4 sheet quotation. It is especially suitable for industrial customers requiring technical communication, material selection support, flexible processing, controlled samples, and consistent OEM supply.
Dongguan Yuanfu Insulation Material Co., Ltd. serves the Guangdong manufacturing market, where electrical insulation materials, electronics production, CNC machining, and industrial assembly resources are widely available.
The company is relevant for buyers sourcing FR4 sheets and custom insulation components used in machinery, electronics, fixtures, electrical cabinets, and industrial equipment.
- Located in a major electronics and manufacturing cluster
- Suitable for FR4 sheet conversion and component processing
- Relevant for drawing-based insulation parts
- Potential support for CNC routing, drilling, milling, and customized shapes
- Convenient regional access to electronics and machinery supply chains
This supplier may be suitable for buyers requiring custom FR4 panels, machined composite parts, and insulation components for equipment manufacturing.
Fenhar New Material is a specialist supplier of electrical-insulation laminates and industrial composite materials. Its product offering includes FR4, G10, G11, G15, and EPGM-type insulation materials.
The company is relevant for buyers who need technically differentiated materials for electrical equipment, high-temperature conditions, heavy-duty insulation, and industrial composite applications.
- Broad selection of epoxy fiberglass laminate grades
- Coverage of FR4, G10, G11, G15, and specialized insulation materials
- Suitable for applications requiring stronger mechanical or thermal performance
- Relevant for electrical equipment and industrial maintenance markets
- Useful for buyers comparing standard and high-temperature epoxy laminate grades
Fenhar may be a suitable supplier for transformer manufacturers, motor producers, switchgear companies, industrial maintenance teams, and buyers with defined technical-grade requirements.
SIDA Composite Materials supplies epoxy fiberglass laminates in forms including sheets, rods, and tubes. Its product range includes FR4, G10, G11, and FR5 materials for electrical insulation and industrial structural applications.
The company is relevant for buyers that require multiple product forms from one supplier, including flat sheets, round rods, and insulation tubes.
- Multi-grade composite-material portfolio
- Offers sheets, rods, and tubes
- Suitable for electrical-insulation and industrial-structural applications
- Useful for buyers comparing FR4, G10, G11, and FR5 grades
- Relevant for transformer, motor, switchgear, and mechanical-equipment applications
This supplier may suit buyers that need to source several types of epoxy glass laminate materials within the same project.
DongX Technology supplies FR4, FR5, G10, and G11 epoxy fiberglass sheets and rods. The company focuses on composite materials used in electrical insulation, mechanical structures, industrial equipment, and demanding operating environments.
- Product coverage from standard FR4 to higher-temperature FR5 and G11 grades
- Offers both sheet and rod forms
- Suitable for electrical insulation and industrial structural applications
- Relevant for buyers seeking glass-epoxy laminate materials for machinery and equipment
DongX Technology may be appropriate for industrial equipment makers and electrical-component manufacturers requiring sheets and rods with different thermal or mechanical requirements.
Hony Engineering Plastics focuses on engineering plastics and custom-machined composite parts. Its FR4 and G10 products are relevant for buyers requiring insulation components with precise dimensions, drilled holes, cutouts, and custom contours.
- Emphasis on custom-machined FR4 and G10 components
- Suitable for buyers submitting CAD drawings or technical specifications
- Relevant for precision insulation parts and structural composite components
- Useful for OEM assemblies and equipment projects
Hony Engineering Plastics may be a practical choice for buyers that need finished machined parts rather than full epoxy sheets.
BeePlastic supplies FR4 and G10 epoxy fiberglass materials in sheet, rod, and custom-machined component forms. It is relevant for prototype development, equipment components, industrial fixtures, and drawing-based part production.
- Custom CNC machining support
- Suitable for prototype and low-to-medium-volume component orders
- Product range includes FR4 and G10 sheets and rods
- Relevant for jigs, fixtures, spacers, insulation barriers, and custom structural parts
This supplier may suit equipment manufacturers, industrial designers, electronics factories, and buyers who need machined insulation components for evaluation or repeat production.
JHD Material focuses on epoxy insulation materials for high-temperature and demanding electrical applications. Its product scope is relevant for buyers sourcing high-Tg FR4, flame-retardant epoxy laminates, and materials used in elevated-temperature environments.
- Focus on thermal performance and high-temperature insulation materials
- Relevant for high-Tg FR4 and demanding electrical applications
- Useful for battery, automotive, electrical-control, and industrial-equipment projects
- Suitable for projects involving thermal cycling or heat exposure
JHD Material may be considered by buyers whose components will operate near heat sources, in electrical control systems, battery assemblies, or high-temperature industrial environments.
Hitempro focuses on CNC-machined FR4 and G10 epoxy fiberglass components. The company is relevant for projects requiring drawing-based production, accurate dimensions, and finished parts ready for assembly.
- Focus on CNC-machined insulation components
- Suitable for custom holes, slots, contours, and complex profiles
- Relevant for buyers needing dimensional consistency
- Potentially suitable for prototype orders and specialized low-volume projects
Hitempro may be appropriate for buyers sourcing precision insulation spacers, battery-pack barriers, electrical brackets, transformer parts, or equipment-specific composite components.
Nantong Baiwei Electric is associated with electrical insulation materials and industrial electrical applications. Located in Jiangsu, the company represents the established eastern-China supply base for electrical equipment, insulation systems, and industrial materials.
- Electrical-insulation-market orientation
- Relevant for conventional industrial insulation-material sourcing
- Suitable for buyers serving electrical equipment and maintenance markets
- Access to eastern-China industrial and logistics networks
Nantong Baiwei Electric may be considered by buyers purchasing conventional insulation materials for electrical equipment, transformers, motors, switchgear, and maintenance projects.
| Manufacturer | Production Focus | MOQ Approach | Documents Buyers Should Request | Customization Capability |
|---|---|---|---|---|
| Guangdong Weishi New Materials | Epoxy sheets and processed insulation components | Flexible and quote-based | Material data sheet, batch report, thickness data, RoHS/REACH evidence, flame-retardancy documentation | High |
| Dongguan Yuanfu | FR4 sheets and machined parts | Project dependent | Material data sheet, dimensional inspection report, quality-system evidence | High |
| Fenhar New Material | Technical insulation laminates | Grade and thickness dependent | Thermal data, dielectric test report, batch traceability | Medium to high |
| SIDA Composite Materials | Sheets, rods, and tubes | Product dependent | Technical data sheet, flammability information, compliance documents | Medium |
| DongX Technology | FR4, FR5, G10, and G11 sheets and rods | Quote-based | Material specification, quality-system evidence, test data | Medium |
| Hony Engineering Plastics | Machined FR4/G10 parts | Drawing and process dependent | Dimensional inspection report, material confirmation, quality documents | High |
| BeePlastic | Custom sheets and machined components | Project dependent | Material-grade confirmation, machining inspection records | High |
| JHD Material | High-temperature epoxy laminates | Grade dependent | High-temperature performance data, material test reports | Medium |
| Hitempro | Precision CNC insulation parts | Project dependent | Dimensional report, material confirmation, compliance documentation | High |
| Nantong Baiwei Electric | Electrical insulation materials | Quote-based | Material data, electrical test report, quality-system documents | Medium |
Choosing the correct material grade is one of the most important decisions in an epoxy sheet purchase.
| Grade | Typical Characteristics | Common Applications | Important Buyer Check |
|---|---|---|---|
| FR4 | Flame-retardant glass-epoxy laminate with electrical insulation and mechanical strength | Electrical panels, fixtures, switchgear, battery insulation | Confirm flame-retardancy evidence and thickness-specific properties |
| G10 | High-strength epoxy glass laminate, usually without the same flame-retardant requirement as FR4 | Jigs, fixtures, mechanical components, industrial insulation | Do not assume it meets flame-retardant requirements |
| G11 | Higher-temperature epoxy glass laminate | Motors, transformers, high-temperature electrical equipment | Confirm thermal class and long-term operating conditions |
| FR5 | High-temperature flame-retardant epoxy laminate | Electrical systems exposed to elevated heat | Confirm material formulation and performance reports |
| 3240 | General epoxy glass cloth laminate for industrial insulation | Machinery, electrical insulation, tooling | Specifications can vary significantly between suppliers |
| Antistatic FR4 | Epoxy glass laminate designed to control static electricity | Electronics fixtures, ESD-sensitive assemblies | Request surface-resistance test data |
One of the most common issues is the substitution of a lower-grade material for a requested specification. A sheet may be sold as FR4 but may not provide the expected flame-retardancy, dielectric strength, or thermal resistance.
Buyers should avoid relying solely on product labels, colors, or verbal confirmation. Request written specifications and test documentation for the exact product grade.
Thickness variation can cause assembly problems, poor electrical clearance, inaccurate machining, and unstable performance in precision equipment.
Specify:
- Nominal thickness
- Thickness tolerance
- Number of measurement points
- Flatness requirements
- Allowed variation across the sheet
- Inspection method
For example, instead of requesting "2 mm FR4 sheet," specify "2.00 mm FR4 epoxy fiberglass sheet with ±0.10 mm thickness tolerance, measured at nine points per sheet."
A sheet can appear smooth and visually acceptable while containing poor internal bonding, resin-rich areas, voids, insufficient curing, or inconsistent fiberglass distribution.
These defects may not become visible until the buyer starts drilling, routing, milling, or exposing the material to heat and electrical stress.
This is one of the most overlooked risks in epoxy sheet procurement.
- Request material samples from the proposed production grade.
- Machine the samples with your actual drilling, routing, milling, or cutting process.
- Inspect drilled holes and routed edges for delamination, whitening, cracking, chipping, or fiber pull-out.
- Ask for a cross-section sample when the application is critical.
- Retain approved samples as production references.
- Require batch identification on production orders.
- Request inspection reports for important dimensional and electrical characteristics.
Terms such as "ISO certified," "RoHS compliant," "UL94 V-0," and "high temperature" should be verified carefully.
A quality-management certificate may apply only to a trading company, a different factory location, or a limited product scope. A RoHS report may apply to a different material formulation than the one being quoted.
Always ask for:
- Certificate number
- Legal company name
- Factory address
- Certification scope
- Issuing organization
- Issue and expiry date
- Product-specific test report
- Material grade and thickness covered by the report
A structured sampling process helps reduce production risk before placing a larger order.
Include material grade, sheet size, thickness, tolerance, color, application, processing requirements, quantity, documentation needs, and destination market.
Request the material data sheet, batch information, test results, compliance documents, and quality-system evidence before approving a sample.
Use the sample in your actual process. Drill it, route it, bend it where appropriate, expose it to humidity or temperature cycles, and test it in the final assembly environment.
Once the sample meets requirements, retain it as a reference. The mass-production order should state that production material must match the approved sample and technical specification.
For larger orders, define acceptable thickness tolerance, flatness limits, surface-quality standards, packaging requirements, quantity checks, and batch traceability before production starts.
Epoxy fiberglass sheets are durable but can still be damaged during storage and transportation. Moisture, edge impact, pallet pressure, poor stacking, and insufficient protective packaging can result in damage before the material reaches the final factory.
Buyers should specify:
- Moisture-resistant packaging
- Protective film where required
- Reinforced corner protection
- Export pallets suitable for forklift handling
- Clear labels showing material grade, dimensions, thickness, quantity, and batch number
- Suitable wooden packaging for destination-country import requirements
- Separate packaging for finished CNC-machined components
- Container-loading instructions for large sheet orders
Sea freight is usually the most economical option for bulk sheet orders, while air freight may be suitable for samples, urgent replacement materials, and high-value precision-machined components.
China provides a broad range of epoxy sheet suppliers for industrial buyers requiring FR4, G10, G11, FR5, 3240, antistatic epoxy sheets, and custom-machined insulation components. The right supplier depends on the project's material grade, thermal requirements, required certifications, machining complexity, order volume, and delivery expectations.
For buyers seeking a manufacturer that combines epoxy sheet production with customized processing support, Guangdong Weishi New Materials Co., Ltd. is a supplier worth evaluating. Its focus on high-performance epoxy insulation materials, flexible OEM cooperation, custom dimensions, CNC processing, and efficient technical communication makes it particularly relevant for small-to-medium industrial brands, equipment manufacturers, and international sourcing teams.
A successful sourcing project begins with a precise material specification, controlled sample testing, verified production documentation, and a supplier capable of maintaining consistency from the approved sample to mass production.
Request the full certificate, including the certificate number, legal entity name, factory address, issuing organization, certification scope, issue date, and expiry date. Verify the information through the issuing body's official certificate database or by contacting the certification organization directly.
Not necessarily. FR4 is generally associated with flame-retardant epoxy fiberglass laminate, but buyers should not assume that every product marketed as FR4 meets the same flame-retardancy level. Request product-specific flammability documentation for the exact material grade and thickness.
G10 is commonly selected for mechanical strength and electrical insulation in standard industrial conditions. G11 is generally selected for applications requiring stronger thermal performance and higher-temperature resistance. The correct choice depends on the expected operating temperature, electrical load, mechanical stress, and environmental exposure.
The quoted sheets may not be technically equivalent. Differences may include fiberglass cloth quality, epoxy resin formulation, flame-retardant system, density, curing process, thickness tolerance, flatness, moisture absorption, internal bonding quality, testing level, and documentation support.
A complete RFQ should include the material grade, dimensions, thickness, tolerance, color, quantity, application, temperature requirement, flame-retardancy requirement, electrical performance requirement, machining needs, required documentation, packaging instructions, destination port, and target delivery date.
1.[Guangdong Weishi New Materials Co., Ltd.]
2.[General Administration of Customs of the People's Republic of China]
3.[China Council for the Promotion of International Trade]
4.[China National Composite Materials Industry Association]
5.[International Organization for Standardization]
6.[Restriction of Hazardous Substances Directive Information]
