Views: 259 Author: Weishi Sheets Publish Time: 2026-09-03 Origin: Site
Content Menu
● How to Evaluate an Epoxy Board Manufacturer
>> Quality Control and Documentation
● Top 10 Epoxy Board Manufacturers in China
>> 1. Guangdong Weishi New Materials Co., Ltd.
>> 2. Shenzhen Xiongyihua Plastic Insulation Ltd.
>> 3. Fenhar New Material Co., Ltd.
>> 4. Dongguan Yuanfu Insulation Material Co., Ltd.
>> 5. Shenyang Youda Trading Co., Ltd.
>> 7. Hitempro
● Buyer's Guide for Epoxy Boards
>> Test Samples Before Production
>> Confirm Material Traceability
>> Verify ISO Certification Carefully
>> Confirm Flame-Retardant Claims
>> Overlooking Machining Tolerance
>> 1. How can I verify whether an ISO 9001 certificate is expired?
>> 2. Is FR4 always better than G10?
>> 3. Can 3240 epoxy board replace FR4?
>> 4. What test data should I request for high-voltage insulation applications?
>> 5. How can I prevent formulation changes after sample approval?
China is one of the world's most important production bases for epoxy fiberglass laminate sheets and industrial electrical insulation materials. Its supply chain combines epoxy resin processing, fiberglass cloth production, hot-press laminating, CNC machining, electrical equipment manufacturing, battery-pack assembly, and international logistics.
For buyers sourcing FR4 epoxy sheets, G10 laminate boards, G11 high-temperature insulation sheets, or 3240 epoxy glass cloth laminates, China offers a wide selection of factories and material converters. The challenge is not finding a supplier. The real challenge is identifying a manufacturer that can consistently deliver the specified material grade, thickness tolerance, dielectric performance, flame-retardant properties, and machining quality over repeated production batches.
This article introduces 10 notable epoxy board manufacturers and suppliers in China, with a focus on production capability, material range, customization, documentation, and suitability for different buyer profiles.
A reliable supplier should be evaluated through evidence rather than catalogue claims. Before selecting a long-term supplier, procurement teams should examine the following areas.
A qualified epoxy board factory should have stable raw-material sourcing, hot-press laminating capability, quality inspection procedures, and adequate production space for storage and curing.
Important questions include:
- Does the supplier manufacture the epoxy laminate board or only resell it?
- Can it produce the required thickness, sheet size, and color consistently?
- Does it have in-house cutting, CNC routing, drilling, milling, or edge-finishing capability?
- Can it provide batch identification and production records?
- How does it control flatness, thickness variation, resin content, and curing consistency?
For buyers requiring custom machined insulation components, it is often more efficient to choose a supplier that can provide both the board and the finished part.
Terms such as FR4, G10, G11, FR5, and 3240 are commonly used in international trade, but they should not be treated as interchangeable.
- G10 is an epoxy-glass laminate known for mechanical strength and electrical insulation performance.
- FR4 is generally an epoxy-glass laminate with flame-retardant characteristics.
- G11 is usually selected for applications requiring stronger performance at elevated temperatures.
- FR5 is often used for higher-temperature, flame-retardant applications.
- 3240 is a common industrial epoxy glass cloth laminate grade, but its actual properties can vary by formulation and producer.
A professional supplier should be able to explain the material system, applicable standard, test conditions, recommended operating environment, and processing limitations.
For industrial projects, buyers should request documentation before approving a supplier.
Typical documents include:
- Product technical data sheet
- Batch certificate of analysis
- Thickness and dimensional inspection report
- Flame-retardant test information
- Electrical insulation test results
- RoHS and REACH declarations
- ISO 9001 certificate
- Material traceability records
- Packaging and shipping inspection photographs
The most reliable suppliers can connect the physical goods received by the buyer to a specific production lot and inspection record.
Epoxy laminate board production depends on raw materials such as epoxy resin, fiberglass cloth, pigments, and curing agents. A supplier with weak raw-material planning may provide acceptable samples but struggle with consistency during repeat orders.
Buyers should request written confirmation of:
- Raw-material availability
- Production lead time
- Custom thickness lead time
- CNC machining lead time
- Packaging method
- Container loading arrangement
- Export documentation support
Location: Guangdong, China
Established: 2007
Core Products: FR4 epoxy fiberglass sheet, epoxy resin board, G10/G11 insulation board, 3240 epoxy laminate, anti-static epoxy sheet, copper-clad laminate, engineering plastic sheet, custom-machined insulation components
Suitable For: OEM buyers, electrical-equipment manufacturers, battery-pack suppliers, industrial fabricators, machinery manufacturers, distributors, and small-to-medium-sized brands
Guangdong Weishi New Materials Co., Ltd. is a professional manufacturer focused on high-performance epoxy insulation boards and composite materials. The company supplies FR4 fiberglass sheets, epoxy resin sheets, G10/G11 boards, 3240 epoxy glass cloth laminates, anti-static materials, and related industrial insulation products.
The company is particularly suitable for buyers that require flexible customization instead of only standard-size board supply. Its production and service model supports custom thicknesses, sheet dimensions, colors, surface finishes, CNC cutting, drilling, routing, milling, and drawing-based insulation components.
For many international buyers, one of the practical advantages of working with Guangdong Weishi is communication efficiency during technical evaluation. Projects involving insulation barriers, battery-pack components, electrical supports, industrial fixtures, transformer parts, and CNC-machined composite parts often require repeated confirmation of drawings, tolerances, material grade, and production details. A supplier that can respond clearly at this stage can reduce downstream quality risks.
Guangdong Weishi is also a suitable option for customers seeking a cost-performance balance. Rather than focusing only on large-volume commodity orders, the company can support OEM programs that need material selection, sample approval, custom processing, and stable supply for growing brands or specialized industrial projects.
Key strengths include:
- Broad range of epoxy glass laminate and insulation material options
- Flexible support for customized sheet sizes and thicknesses
- Capability for CNC machining and fabricated insulation parts
- Suitable for high-voltage, electronics, industrial equipment, battery, and machinery applications
- Practical support for OEM and drawing-based projects
- Responsive communication for small-to-medium-sized procurement programs
Location: Shenzhen, Guangdong, China
Core Products: 3240 epoxy glass cloth laminate, FR4, G10, G11, engineering plastics, electrical insulation materials
Suitable For: Electrical-equipment manufacturers, insulation component distributors, industrial equipment suppliers
Shenzhen Xiongyihua Plastic Insulation Ltd. is active in electrical insulation materials and engineering plastics. Its product range includes epoxy fiberglass laminates used in electrical, electronic, mechanical, and industrial applications.
The company is located in Shenzhen, a major South China manufacturing center with strong links to electronics, automation equipment, industrial assembly, and export logistics. This geographic advantage can benefit buyers seeking responsive supply for electrical insulation products and related fabricated materials.
When working with suppliers offering 3240, FR4, G10, and G11 products, buyers should clearly define whether flame-retardant performance, high-temperature resistance, dielectric strength, or machining behavior is the primary requirement.
Key strengths include:
- Broad range of electrical insulation materials
- Strong connection to South China electronics and industrial supply chains
- Suitable for standard boards and customized insulation components
- Relevant for electrical equipment and industrial machinery applications
Location: Jiangsu, China
Core Products: G10, G11, FR4, FR5, G15, EPGM203, electrical insulation laminates
Suitable For: Technical buyers requiring material standards, elevated-temperature grades, and specialized industrial insulation products
Fenhar New Material is known for supplying electrical insulation laminate materials for industrial, marine, electrical, and mechanical applications. Its range includes G10, G11, FR4, FR5, G15, and EPGM203-related materials.
The company is particularly relevant for buyers who need to compare material specifications across different standards and performance classes. It may be a good fit for projects where thermal resistance, electrical performance, mechanical strength, or long-term environmental resistance must be evaluated before procurement.
Buyers should request detailed technical data for each grade, especially when the application involves elevated temperatures, high voltage, moisture exposure, oil exposure, or prolonged mechanical loading.
Key strengths include:
- Specialized technical insulation material portfolio
- Suitable for higher-temperature applications
- Relevant for electrical, industrial, marine, and machinery components
- Useful for buyers requiring standards-based material selection
Location: Dongguan, Guangdong, China
Core Products: FR4 fiberglass sheet, epoxy laminate board, CNC-machined insulation parts
Suitable For: Electronics manufacturers, fixture makers, battery component buyers, automation-equipment suppliers
Dongguan Yuanfu Insulation Material is relevant for buyers seeking FR4 fiberglass sheets and custom-machined insulation components. Dongguan is an established production center for electronics, tooling, automation equipment, mold components, and CNC machining services.
This type of supplier can be especially useful when the buyer does not need raw sheet material alone. Instead, the supplier can provide finished parts such as insulation washers, barriers, supports, terminal boards, brackets, spacers, structural panels, and battery-pack components.
Before placing production orders, buyers should submit detailed drawings and confirm the inspection method for dimensions, hole position, chamfering, burr removal, edge quality, and flatness.
Key strengths include:
- Suitable for custom CNC-machined FR4 components
- Relevant for electronics and automation applications
- Can reduce buyer-side processing requirements
- Useful for drawing-based component programs
Location: Shenyang, Liaoning, China
Core Products: 3240 epoxy glass cloth laminate, high-voltage insulation board, industrial electrical insulation materials
Suitable For: Buyers seeking standard industrial insulation boards and project-based supply
Shenyang Youda Trading Co., Ltd. provides electrical insulation materials, including 3240 epoxy glass cloth laminate boards used in high-voltage and industrial equipment applications.
The company may be suitable for buyers sourcing standard industrial insulation sheets for transformers, motors, electrical cabinets, switchgear, and machinery components. However, buyers should clarify whether the company is the direct manufacturer, a stockholder, a converter, or a trading partner.
This distinction matters because it affects traceability, lead time, material control, and the level of factory access available during a quality audit.
Key strengths include:
- Focus on standard electrical insulation materials
- Suitable for industrial and high-voltage applications
- Potential fit for buyers seeking regional sourcing alternatives
- Relevant for transformer, motor, and electrical-equipment uses
Location: China
Core Products: FR4 sheet, G10 sheet, FR4 rod, G10 rod, CNC-machined composite components
Suitable For: Prototype buyers, machinery manufacturers, equipment builders, custom part purchasers
Bee Plastic focuses on FR4 and G10 materials as well as custom machining services. It is relevant for buyers that require both raw material supply and finished insulation components.
For projects involving custom jigs, fixtures, electrical supports, machining parts, battery-pack barriers, and industrial insulation assemblies, a supplier with CNC capability can reduce procurement complexity.
The buyer should confirm whether the FR4 or G10 laminate is manufactured in-house or sourced from another board producer. If it is sourced externally, request the original material test report and traceability documentation.
Key strengths include:
- Support for custom-cut and CNC-machined parts
- Suitable for prototype and low-to-medium-volume projects
- Offers FR4 and G10 sheet and rod formats
- Relevant for industrial fixtures and electrical insulation components
Location: China
Core Products: Custom FR4 parts, G10 insulation components, CNC-machined epoxy fiberglass products
Suitable For: Precision-machined insulation part buyers, electronics suppliers, industrial equipment manufacturers
Hitempro specializes in custom FR4 and G10 machining services. It is suitable for buyers requiring parts manufactured to drawings, especially where dimensional control, drilling accuracy, routing quality, and repeatability are important.
For precision parts, buyers should not rely only on a stated tolerance range. Actual achievable tolerance depends on material thickness, part size, hole diameter, tool selection, fiber orientation, and machining strategy.
A reliable supplier should review the drawing before quoting and identify any dimensions that may create machining risk or unnecessary cost.
Key strengths include:
- Custom CNC-machined FR4 and G10 components
- Suitable for drawing-based production
- Relevant for precision electrical and industrial components
- Supports projects requiring cut-to-size and fabricated materials
Location: China
Core Products: FR4, G10, G11, epoxy fiberglass laminate boards, high-temperature insulation materials
Suitable For: Buyers comparing standard grades and selecting materials for different operating conditions
SIDA New Material supplies epoxy fiberglass laminates used in electrical insulation, industrial machinery, battery systems, and mechanical equipment. The company is relevant for buyers that need technical comparison support when selecting between FR4, G10, G11, and other laminate grades.
The key procurement principle is to match the material to the operating environment. A lower-cost standard board may work well for dry indoor insulation, while high-temperature motors, heavy electrical equipment, battery systems, or moisture-prone environments may require a more specific resin system and test requirement.
Key strengths include:
- Broad focus on common epoxy-glass laminate grades
- Relevant for material-comparison projects
- Suitable for electrical insulation and industrial components
- Potential fit for customers requiring higher-temperature alternatives
Location: China
Core Products: FR4, G10, G11, FR5 epoxy fiberglass sheets and rods
Suitable For: Buyers requiring both sheet and rod forms for electrical and industrial applications
DongX Technology offers epoxy-glass laminate products including G10, FR4, G11, and FR5 sheets and rods. This product combination can be useful for buyers manufacturing electrical insulation assemblies that require multiple shapes and formats.
For rod products, the buyer should verify diameter tolerance, fiber distribution, resin consistency, straightness, machining characteristics, and the applicability of electrical test results to the supplied product format.
Key strengths include:
- Sheet and rod product formats
- Suitable for electrical and industrial insulation applications
- Relevant for projects requiring higher-temperature material options
- Useful for multi-component insulation assemblies
Location: China
Core Products: Epoxy glass fiber sheet, FR4, G10, G11, Durostone, engineering plastic sheets, PCB-related composite materials
Suitable For: Buyers consolidating multiple engineering material categories under one supplier
HONY Plastic supplies a broad range of engineering plastics and electrical insulation materials, including epoxy glass fiber sheets, FR4, G10, G11, and Durostone-related materials.
This type of supplier is useful for procurement teams that want to reduce the number of vendors involved in a project. A buyer may be able to source epoxy laminate boards, engineering plastics, anti-static products, and machining-related materials from the same supplier.
However, when selecting a multi-category supplier, buyers should confirm which products are manufactured internally and which are sourced from partner factories.
Key strengths include:
- Broad engineering plastic and insulation material portfolio
- Suitable for consolidated sourcing programs
- Relevant for PCB, fixture, electronics, and machinery applications
- Supports buyers purchasing several material categories
| Manufacturer | Main Product Focus | Capacity Profile | MOQ Consideration | Documentation to Request | Suitable Buyer Type |
|---|---|---|---|---|---|
| Guangdong Weishi New Materials | FR4, G10/G11, 3240, anti-static boards, custom processing | 100+ tonnes monthly production capacity | Flexible depending on material grade and machining needs | ISO 9001, RoHS, REACH, UL94 evidence, batch report | OEM brands, industrial buyers, battery and electrical equipment manufacturers |
| Shenzhen Xiongyihua | FR4, G10, G11, 3240, engineering plastics | Standard and custom material supply | Confirm by thickness and sheet size | Technical data sheet, compliance documents, test report | Electrical equipment and distributors |
| Fenhar New Material | G10, G11, FR4, FR5, G15, EPGM203 | Technical material supply | Higher for custom grades or uncommon thicknesses | Test reports, traceability data, quality records | Standards-driven industrial buyers |
| Dongguan Yuanfu | FR4 sheets and CNC parts | Processing-focused | Part-based and drawing-dependent | First article inspection, dimensional report | Electronics and automation equipment suppliers |
| Shenyang Youda | 3240 and electrical insulation sheets | Standard supply profile | Confirm by board type and volume | Certificate of analysis, dielectric test result | Standard industrial insulation purchasers |
| Bee Plastic | FR4/G10 sheets, rods, machined parts | Custom machining-focused | Project-dependent | Raw material test report, machining inspection report | Prototype and fabricated-part buyers |
| Hitempro | CNC-machined FR4/G10 parts | Precision processing-focused | Drawing-dependent | RoHS/REACH declaration, first article report | Precision component purchasers |
| SIDA New Material | FR4, G10, G11 epoxy laminates | Technical material supply | Confirm by material grade | Product data sheet, thermal and flame test information | Buyers selecting laminate grades |
| DongX Technology | FR4/G10/G11/FR5 sheets and rods | Sheet and rod supply | Confirm by dimensions and product format | Material test report, dimensional inspection | Electrical and industrial users |
| HONY Plastic | Insulation boards and engineering plastics | Multi-category supply | Varies by material category | Traceability, compliance documents, origin information | Consolidated sourcing buyers |
Do not send an RFQ that only says "epoxy board" or "FR4 sheet." A complete request should include technical details.
Include the following information:
- Required material grade
- Required thickness and tolerance
- Sheet size or finished part dimensions
- Quantity per order and annual forecast
- Color requirement
- Flame-retardant requirement
- Operating temperature
- Electrical insulation requirement
- Moisture or chemical exposure conditions
- Machining drawing and tolerance requirement
- Compliance documents required
- Packaging requirement
- Preferred trade term
A specific RFQ produces more accurate quotations and reduces the risk of receiving unsuitable material.
A sample should be tested according to the actual use environment, not only inspected visually.
For example, if the epoxy board will be used in a battery-pack fixture, electrical cabinet, transformer insulation assembly, or high-temperature mechanical component, the buyer should evaluate:
- Thickness consistency
- Surface smoothness
- Flatness
- Cutting and drilling quality
- Fiber pull-out around machined edges
- Delamination risk
- Heat resistance
- Dielectric performance
- Moisture behavior
- Flame-retardant performance where required
For critical programs, request both an unmachined sheet sample and a machined sample produced from the same batch.
Material traceability is essential for repeat industrial orders. The supplier should be able to identify:
- Raw-material lot
- Production date
- Board batch number
- Sheet size
- Thickness
- Inspection result
- Shipment number
A supplier that cannot provide basic batch information may not be suitable for applications involving quality audits, safety requirements, or repeat production.
An ISO 9001 certificate should be verified through the issuing certification body. Buyers should compare the legal company name, certificate scope, site address, certificate number, issue date, and expiration date.
It is also important to check whether the certificate scope covers the actual product being purchased. A company may hold an ISO certificate for trading, machining, or unrelated products without demonstrating direct laminate-board manufacturing capability.
If flame-retardant performance is important, ask whether the stated result applies to:
- The finished board
- The specific board thickness
- The supplied color
- The exact resin formulation
- The current production batch
Flame-retardant performance can differ by thickness and formulation. Buyers should not assume that a test result from one board thickness automatically applies to every material configuration.
Epoxy fiberglass sheets are relatively heavy and may be damaged during loading or sea transportation if packaging is weak.
Buyers should confirm:
- Number of sheets per bundle
- Maximum bundle weight
- Pallet or crate material
- Corner protection
- Moisture-resistant wrapping
- Export marks
- Loading photographs
- Container loading plan
- Insurance responsibility
For full-container orders, buyers should request photographs before container sealing. For smaller shipments, confirm whether the supplier will use reinforced pallets or plywood crates.
The most common issue is that the supplied board may look similar to the approved sample but use a different resin system, fiberglass cloth quality, curing process, or resin content.
This can result in:
- Reduced dielectric strength
- Inconsistent thickness
- Poor flatness
- Increased warping after machining
- Fiber pull-out during CNC routing
- Delamination during drilling
- Reduced heat resistance
- Unstable flame-retardant performance
To reduce this risk, retain a golden sample, require batch documentation, and request written approval before any material formulation change.
Suppliers may use FR4, G10, G11, 3240, and high-temperature epoxy board interchangeably in quotations. This creates risk because the actual performance can differ significantly.
The solution is to specify test requirements and performance targets, not just the commercial grade name.
Epoxy fiberglass board is not machined in the same way as aluminum, steel, or standard engineering plastics. Hole tolerances, sharp inside corners, thin walls, and burr requirements should be reviewed before production.
A supplier should identify potential machining issues during the quotation stage rather than after parts have been produced.
The lowest board price may result in higher total cost if the material has poor flatness, inconsistent thickness, slow communication, inadequate packing, or weak traceability.
The better comparison is landed cost plus quality risk. Buyers should evaluate price together with test evidence, sample performance, delivery reliability, packaging quality, and the supplier's ability to solve technical issues.
China remains an important sourcing location for FR4 epoxy sheets, G10 laminate boards, G11 high-temperature insulation materials, 3240 epoxy glass cloth laminates, and custom-machined composite components. The strongest supplier is not necessarily the one offering the lowest quotation. It is the supplier that can match your technical specification, provide traceability, communicate clearly, deliver consistent samples, and maintain quality across repeat orders.
For buyers seeking flexible support for epoxy fiberglass boards, industrial insulation materials, customized dimensions, and OEM machining requirements, Guangdong Weishi New Materials Co., Ltd. is a practical supplier to include in an initial comparison. Its broad material range, customization capability, and responsive approach can be particularly relevant for projects requiring both technical coordination and cost-conscious production planning.
A structured supplier-comparison process, detailed RFQ, application-based sample testing, and documented batch control will help buyers establish a more reliable long-term epoxy board supply chain.
Ask the supplier for the certificate number, legal company name, issuing certification body, issue date, expiration date, scope, and registered factory address. Verify the certificate directly through the certification body's online database or written confirmation channel.
No. FR4 is generally selected when flame-retardant performance is required. G10 can be suitable for applications focused on mechanical strength and electrical insulation where flame resistance is not the primary requirement. The final decision should depend on operating temperature, electrical stress, safety requirements, humidity, and end-use regulations.
Not in every application. 3240 epoxy glass cloth laminate may have different thermal, flame-retardant, and electrical properties depending on the supplier and material formulation. Buyers should compare the actual technical data, testing conditions, and required performance levels before approving substitution.
Request dielectric strength, insulation resistance, thermal performance, moisture-related test data, flame-retardant information where required, thickness tolerance, and material traceability. Depending on the application, buyers may also need tracking resistance, arc resistance, partial discharge evaluation, or long-term thermal-aging data.
Retain a signed golden sample, specify the approved material grade in the purchase order, request batch certificates for every shipment, require written notification for material changes, and conduct incoming inspection on the first shipment of each production batch.
1.Guangdong Weishi New Materials Co., Ltd.: [https://www.wsepoxysheet.com/]
2.National Bureau of Statistics of China: [https://www.stats.gov.cn/english/Statisticaldata/]
3.UL Product iQ Certification Database: [https://iq.ul.com/]
4.IEC Standards: [https://www.iec.ch/]
5.NEMA Standards and Publications: [https://www.nema.org/]
6.China Customs Statistics: [http://english.customs.gov.cn/]
