Views: 233 Author: Weishi Sheets Publish Time: 2026-08-09 Origin: Site
Content Menu
● Introduction: China's Role in Epoxy Resin Sheet Manufacturing
● How We Selected These 10 Manufacturers
>> 1. Factory certifications and compliance
>> 2. Technical capability and material coverage
>> 3. Quality control and production stability
>> 4. Flexibility, lead time and OEM/ODM support
>> 5. International experience and communication efficiency
● Practical Evaluation Framework for Epoxy Resin Sheet Suppliers
>> Factory recognition and documentation
>> Material grades and standards
>> Lead time consistency and inventory strategy
● Top 10 Epoxy Resin Sheet Manufacturers in China (2026)
>> 1. Guangdong Weishi New Materials Co., Ltd.
>> 2. Shenzhen Xiongyihua Plastic Insulation Ltd.
>> 3. Zhejiang Jingjing Insulation Materials Co., Ltd.
>> 4. Shenzhen Suxilong New Material Co., Ltd.
>> 5. Xuchang Rainyan Insulation Material Co., Ltd.
>> 6. Henan Jinzhi Electrical Insulation New Material Co., Ltd.
>> 7. Guangde Huachang New Materials Co., Ltd.
>> 8. Beijing Red Sun Technology Co., Ltd.
>> 9. Hitex Insulation (Ningbo) Co., Ltd.
>> 10. Shenzhen Baekeland Plastic Product Co., Ltd.
● Comparison Table: Key Parameters Across the 10 Manufacturers
● Common Pitfalls in Epoxy Sheet Procurement and How to Avoid Them
>> 1. Hidden downgrading of material grade
>> 2. Decorative certificates without real coverage
>> 3. Insufficient control of flatness and thickness tolerance
>> 4. Incomplete OEM/ODM communication
>> 5. Under‑estimating the impact of logistics and packaging
● Sample and Trial Production Workflow Recommendations
>> Step 1: Define sample objectives
>> Step 2: Test key properties
>> Step 3: Small‑scale trial production
● Logistics and Packaging Considerations
● Market Outlook for Epoxy Resin Sheets
● FAQ
China is one of the most important global bases for epoxy resin and related electrical insulation composites. From epoxy resin raw materials to FR4, G10, G11 and 3240 fiberglass laminates, the upstream and downstream supply chain is highly integrated.
Regions such as Guangdong, Zhejiang and Henan host dense clusters of electronic, electrical and insulation material manufacturers. This clustering supports stable capacity, competitive cost structures and broad technical capabilities for PCB tooling, transformers, motors, industrial equipment and renewable energy applications.
For purchasing managers looking for long-term cooperation, the local ecosystem offers clear advantages in capacity planning, cost control and standardized compliance for multiple destination markets.
This guide is built from a procurement-oriented perspective and follows transparent evaluation criteria. The main dimensions are:
- Existence and continuity of quality and environmental management systems (e.g., ISO9001, ISO14001).
- Product-level compliance with relevant standards, such as UL94 V-0 flammability, RoHS and REACH environmental requirements, IEC/NEMA standards for epoxy laminates (FR4, G10, G11, FR5, 3240).
- Availability of traceable test reports for dielectric strength, insulation resistance, thermal class and mechanical performance.
- Ability to produce multiple material grades: FR4, G10, G11, FR5, 3240 and special variants such as high-Tg, halogen-free, anti-static and arc-resistant grades.
- Process know‑how in resin formulation, fiberglass lay‑up, hot‑press curing and dimensional stability control for demanding applications.
- Support for customization: special thickness ranges, tight tolerances, specific colors and surface finishes, as well as complex machined parts.
- Defined QC procedures from incoming raw materials to finished boards, including thickness tolerance, flatness, visual inspection and electrical tests.
- Batch-level records and traceability for complaint investigation and corrective actions.
- Stable monthly capacity and consistent performance suitable for repeated orders and multi‑year projects.
- Typical lead times for standard sheets (often 7–20 days) and realistic handling of urgent orders.
- Depth of OEM/ODM services: CNC machining, drilling, routing, specialized fixtures, jigs and assembled insulation components.
- Responsiveness in drawing review, engineering communication and problem solving.
- Export track record to Asia, Europe, North America, South America and the Middle East.
- Ability to handle documentation, packing, labeling and shipping requirements for different regions.
- Communication level of sales and technical teams, especially in English, and familiarity with international trade practices.
Before looking at individual manufacturers, it is useful to adopt a structured evaluation framework:
- Request recent copies of management system certificates and product approvals. Check the issuing body, certificate number and validity period via public databases or official channels.
- Pay attention to whether environmental and safety documents are aligned with the current product formulations rather than older, discontinued versions.
- For FR4, G10/G11, FR5 and 3240 boards, review technical data sheets that cover dielectric strength, insulation resistance, thermal class (e.g., B class 130 °C, F class 155 °C), tensile and flexural strengths, and water absorption.
- Confirm whether the materials are designed in line with IEC, NEMA and industry specifications, especially when boards are used in global projects or cross‑region assemblies.
- Ask if each batch is recorded with key QC parameters (thickness, flatness, visual defects, dielectric test results).
- For high‑reliability applications, clarify whether additional routine tests (e.g., high‑voltage withstand, thermal aging) are performed and documented.
- Evaluate not only quoted delivery times but also the supplier's approach to capacity planning and raw material inventory.
- For key projects, consider establishing rolling forecasts or safety stock arrangements with core suppliers to keep lead times stable in peak seasons.
> The following list is designed as a practical reference for purchasing managers. The order is structured for clarity and does not represent an absolute ranking.
Guangdong Weishi New Materials Co., Ltd. is a composite materials manufacturer founded in 2007 in Heyuan, Guangdong. The factory covers around 20 acres with more than 16,000 m² of building area and operates three standardized workshops. A team of engineers and skilled technicians supports ongoing product development and process optimization.
The company offers a broad portfolio of epoxy-based insulation materials, including FR4, G10, G11, FR5 fiberglass laminates, 3240 epoxy sheets, anti-static boards, copper-clad laminate and various tooling boards. Thickness ranges from very thin sheets to thick structural plates, making it suitable for PCB fixtures, motor insulation, electrical cabinets and energy storage battery protection boards.
Weishi places strong emphasis on process control and environmental management. Their production lines focus on flatness, thickness accuracy, thermal resistance and reliable electrical insulation. Combined with platform recognition and management system certifications, this forms a solid basis for stable quality.
From a purchasing perspective, Weishi is a representative example of a high‑value, development‑oriented factory that actively supports small and mid‑sized brands. The company is particularly competitive in flexible batch sizes, custom machining (CNC, drilling, routing), and one‑stop supply of multiple insulation board types and finished parts. Communication with overseas customers tends to be efficient, which is valuable when drawings need clarification or projects require iterative optimization.
Shenzhen Xiongyihua Plastic Insulation Ltd. has focused on epoxy laminates and insulation solutions since the mid‑2000s, with notable experience in high‑voltage and chemical equipment applications.
Typical products include 3240 epoxy fiberglass cloth boards designed for electrical insulation under B‑class temperature conditions, FR4 boards with UL94 V‑0 flammability and G10 laminates for structural applications. The company's published technical information emphasises dielectric strength, mechanical stability and moisture resistance, making its materials suitable for switchgear, transformers and precision electrical fixtures.
Large monthly capacity and structured process control make this manufacturer attractive for buyers who need continuous high‑volume supply. In addition, one‑stop machining services such as CNC routing, drilling and engraving help reduce the number of external suppliers in complex projects.
Zhejiang Jingjing Insulation Materials Co., Ltd. is part of an eastern China cluster of electronic and insulation material companies. The factory specializes in FR4, G10 and G11 epoxy boards for electrical and mechanical applications.
The company emphasizes standardized production and adherence to management systems. Its position in the regional supply chain allows competitive lead times and relatively stable raw material sourcing. Buyers often use this supplier for mainstream grades and standard dimensions, while still having options for thickness and size customization.
Shenzhen Suxilong New Material Co., Ltd. focuses on 3240 epoxy resin fiberglass sheets and custom plates, serving motor manufacturers, transformer producers and mechanical equipment companies.
Suxilong's strength lies in handling small to medium batch orders and providing flexibility in sizes, colors and fabrication. This is attractive for projects that require specific dimensions, limited quantities or trial runs. Its location in southern China allows convenient export routes and short communication cycles with customers in Asia and beyond.
Xuchang Rainyan Insulation Material Co., Ltd. is located in Henan, a region known for insulation material manufacturing. The company supplies epoxy fiberglass sheets and related products to domestic and overseas customers.
Rainyan tends to focus on higher minimum order quantities and larger production runs. This positioning is suitable for cost‑sensitive projects and long-term contracts where the buyer can consolidate demand into larger batches to secure more favorable pricing and scheduling.
Henan Jinzhi Electrical Insulation New Material Co., Ltd. concentrates on electrical insulation materials, including epoxy resin sheets and FR4/G10/G11 laminates.
Its product range covers common thicknesses and grades used in motors, transformers, control panels and various electrical devices. Typical minimum order quantities fall in the range of dozens of sheets or several hundred kilograms. The company's portfolio and location make it a reasonable option for buyers who need repeated standard-grade deliveries to support continuous manufacturing lines.
Guangde Huachang New Materials Co., Ltd. is based in a composite materials cluster in eastern China. The company manufactures FR4 and G10 epoxy sheets and supplies them to industrial customers with a preference for bulk orders.
This supplier suits buyers who prioritize stable long‑term pricing and steady capacity. With larger minimum order quantities and a focus on standardized products, Huachang can be a good fit for projects with predictable demand patterns.
Beijing Red Sun Technology Co., Ltd. offers a range of epoxy resin sheets and insulation boards and is known for combining board supply with machining capabilities.
Because it can provide both raw boards and processed parts, the company is attractive for customers who want to streamline their supply chain, especially in applications involving complex geometries or multi‑step fabrication. It also has a reputation for relatively fast dispatch for standard orders, which can be useful in time‑critical projects.
Hitex Insulation (Ningbo) Co., Ltd. specializes in insulation materials and laminated sheets, including epoxy-based products.
Its business model focuses on bulk orders and long‑term cooperation, with minimum order quantities suited to buyers who can aggregate demand. The manufacturing and distribution setup in eastern China provides logistical advantages for export shipments and steady supply for repeat orders.
Shenzhen Baekeland Plastic Product Co., Ltd. produces epoxy 3240 laminates, fiberglass sheets and related structural parts widely used in motors, electrical equipment and industrial machinery.
Baekeland is a useful option for buyers who prefer to purchase both sheets and finished components from the same source. This reduces coordination effort and helps maintain consistency between raw material specifications and finished part performance.
The table below summarizes several practical dimensions for comparison. Values are indicative and may vary by specific product and order details.
| Manufacturer | Main grades (FR4/G10/G11/3240) | Capacity / positioning | Typical MOQ | Certifications / status (indicative) | OEM/ODM strengths |
|---|---|---|---|---|---|
| Guangdong Weishi New Materials | FR4, G10, G11, FR5, 3240, anti‑static, tooling boards | ~100+ tons/month, mid‑ to high‑end, SME‑friendly | 10–50 pcs or 10–100 kg | ISO-based systems, audited supplier | Multi‑grade boards, CNC machining, jigs and fixtures, flexible batches |
| Shenzhen Xiongyihua Plastic Insulation | 3240, FR4, G10, tubes and profiles | ~1000 tons/month, high‑voltage and special uses | 50–500 kg | Quality and environmental systems, RoHS‑oriented | High dielectric performance, one‑stop machining |
| Zhejiang Jingjing Insulation | FR4, G10, G11 | Stable batch supply, eastern cluster | ~200 kg | Quality and environmental systems | Standard boards, customized dimensions |
| Shenzhen Suxilong New Material | 3240 epoxy sheets, custom plates | Small–medium batches, customization | 1–50 kg | Audited supplier | Flexible sizes, colors, structural components |
| Xuchang Rainyan Insulation Material | Epoxy fiberglass sheets, FR4 | Large batch, cost‑sensitive projects | ≥500 kg | Audited supplier | Suitable for long‑term bulk contracts |
| Henan Jinzhi Electrical Insulation | Epoxy sheets, FR4/G10/G11 | Electrical industry focus | 50 pcs / 500 kg | Audited supplier | Standard grades for motors, transformers and control panels |
| Guangde Huachang New Materials | FR4, G10 | Bulk supply, eastern China cluster | ≥500 kg | Audited supplier | Long‑term pricing and volume contracts |
| Beijing Red Sun Technology | Epoxy sheets, insulation boards | Technical and fast‑dispatch orientation | ~100 kg | Quality systems in place | Boards plus machining, suitable for complex parts |
| Hitex Insulation (Ningbo) | Epoxy laminated sheets, insulation materials | Bulk orders, long‑term cooperation | ≥100 kg | High‑tier supplier status | Stable periodic deliveries |
| Shenzhen Baekeland Plastic Product | Epoxy 3240, fiberglass sheets | Motor and electrical components focus | 1–100 kg | Audited supplier | Boards and finished structural components |
One of the most frequent issues is using lower‑grade epoxy boards or recycled materials to replace higher‑grade FR4/G10 without upfront disclosure. Such substitution may pass initial visual inspection but can cause cracking, tracking or insulation breakdown under heat, high voltage or moisture over time.
Mitigation measures:
- Always require detailed technical data sheets with clear dielectric and mechanical performance metrics.
- Conduct sample‑stage verification, including high‑voltage tests and thermal cycling where the application is critical.
Certificates displayed in marketing materials may be outdated, limited to previous processes or issued by bodies that are not recognized in the target market.
Mitigation measures:
- Request recent certificates with visible certificate numbers and issuing bodies.
- Independently verify the status and validity period through official channels or databases.
Boards that appear acceptable at first sight can still cause problems if flatness or thickness tolerance is not properly controlled. This can lead to uneven soldering, poor fit of fixtures or unexpected mechanical stress in assemblies.
Mitigation measures:
- Specify acceptable flatness criteria and thickness tolerance in the drawings and purchase contracts.
- Include these parameters in incoming inspection and in potential claim conditions.
Misunderstandings about drawings, reference surfaces, tolerances and edge finishing can result in large batches of parts that do not fit.
Mitigation measures:
- Split the process into clear stages: drawing review, prototype machining, dimension verification and then mass production.
- Require dimension reports for critical features in the prototyping phase and agree on measurement methods.
Epoxy sheets, especially thin and large‑format boards, are sensitive to bending, impact and moisture during transportation.
Mitigation measures:
- Ask suppliers to use moisture‑resistant packaging with reinforced wooden cases and appropriate internal supports.
- Define labeling requirements (grade, thickness, batch number, production date) to facilitate warehouse handling and traceability.
A structured sample and trial production process can significantly reduce risk:
Differentiate between material verification samples (used for testing physical and electrical properties) and structural trial samples (used to validate machining precision and assembly fit). This avoids wasting budget on large trial runs before material suitability is confirmed.
For material verification:
- Test dielectric strength, insulation resistance and water absorption under realistic environmental conditions.
- Check flatness and thickness tolerance using appropriate measuring tools, especially for fixtures and precision applications.
For structural trials:
- Verify critical dimensions, hole positions and edges against drawings.
- Assemble parts in actual or simulated equipment where possible.
After samples pass, implement a small trial batch (for example, 20–50 pieces) before regular mass orders. Use this batch to identify potential issues in machining, handling, assembly and performance.
Feedback from production teams should be consolidated and shared with the supplier to refine the process before larger volumes are launched.
When dealing with cross‑border shipments, proper logistics planning is essential:
- Packaging: Epoxy sheets should be wrapped in moisture‑resistant film, optionally with desiccants, and placed in reinforced wooden cases. Thin or large boards may need internal supports to reduce bending risk.
- Labeling: Each case should be clearly labeled with material grade, thickness, tolerance range, batch number and production date.
- Transport mode: High‑value or sensitive boards are better shipped with appropriate insurance and reliable freight partners. Consider specific customs requirements and regulations in destination countries, particularly for electrical and electronic applications.
Industry reports indicate that China's epoxy resin market is expected to grow steadily over the next few years, driven by electronics, automotive, renewable energy and industrial equipment demand. Export volumes of epoxy materials have also shown robust growth, confirming the global role of China as a major supply base.
For purchasing managers, this suggests:
- Increasing availability of standard and special grades, with greater competition among suppliers.
- More opportunities to engage manufacturers that can support higher‑end demands, such as halogen‑free, high‑Tg, high dielectric strength and application‑specific formulations.
- The importance of selecting partners that invest continuously in technology and process upgrades rather than relying solely on price competition.
Q1: How can I verify whether a supplier's management or product certificate is still valid?
Ask for a clear copy of the certificate with the issuing body, certificate number and validity dates. Use the official website or recognized databases of the certification body to check the current status. If the certificate relates to product performance, confirm that the material model and grade match the one being supplied.
Q2: How do I confirm that an FR4 or G10 board genuinely meets the claimed thermal class?
Beyond reading the data sheet, perform thermal aging tests in a controlled environment at the target temperature for several days and then retest dielectric and mechanical properties. Stable performance without cracking, delamination or significant property loss is a strong indicator that the material meets the intended thermal class.
Q3: Price differences between suppliers are very large. How can I assess the risk of choosing a lower‑priced option?
Check the completeness of technical documentation, the transparency of test data and the track record of similar applications. Conduct comparative sample tests under identical conditions. If lower‑priced samples show inconsistent performance or poor workmanship, the potential long‑term costs may outweigh short‑term savings.
Q4: What is the best way to ensure dimensional accuracy for OEM‑machined epoxy parts?
Clearly define tolerances, reference surfaces, edge treatments and critical dimensions on the drawings. Request dimension reports for key features in the prototype batch. Use a mutually agreed measurement method and, if necessary, cross‑check critical dimensions in your own facility before authorizing large‑scale production.
Q5: How can I reduce damage to boards during international transport?
Specify packaging standards, including moisture protection, reinforced cases and internal supports. Agree on responsibility for packaging quality and inspection at dispatch. Consider using dedicated freight partners familiar with industrial goods and include insurance coverage for damage or loss.
Epoxy Resin Sheet product listings and supplier information (China manufacturers, grades, typical MOQ and certifications): https://www.made-in-china.com/products-search/hot-china-products/Epoxy_Resin_Sheet.html
Guangdong Weishi New Materials Co., Ltd. – company profile and product range (FR4, G10, G11, FR5, 3240, anti‑static boards, tooling plates): https://gdwsxcl.cn/
Example product: high‑performance FR5 epoxy resin fiberglass sheet for electrical insulation applications: https://www.alibaba.com/product-detail/FR5-Epoxy-Resin-Fiberglass-Sheet-G11_1601019244798.html
Industry insights on epoxy sheet brands and dielectric performance: https://www.xyhplastic.com/news/2026-top-7-epoxy-sheet-brands-by-dielectric-strength-performance-373299.html
China epoxy resin export and market analysis, 2024–2026 outlook: https://intl.sci99.com/n/4/655884.html
Global epoxy resins market size and growth projections for 2025–2033: https://www.researchandmarkets.com/reports/3934213/epoxy-resin-market-size-share-and-trends-analysis
