China is a major sourcing base for epoxy fiberglass laminates used in electrical insulation, battery systems, CNC-machined parts, industrial fixtures, tooling, molds and mechanical equipment. Its mature supply chain for fiberglass cloth, epoxy resin, composite pressing, machining and export packaging gives international buyers access to a broad range of Black G10 Sheet options.

However, selecting a supplier requires more than comparing prices. "Black G10 Sheet" can refer to materials with different resin systems, glass-cloth constructions, flame-retardant properties, thickness tolerances, ESD performance and machining characteristics. A black surface alone does not confirm material grade, electrical performance or compliance status.

For professional procurement teams, the most important objective is to identify manufacturers that can provide stable batch quality, clear documentation, reliable delivery schedules and practical support for custom dimensions or machined components.

Black G10 Sheet Manufacturing Guide

Why Source Black G10 Sheet from China?

China's electrical insulation material industry benefits from strong industrial clusters in Guangdong, Jiangsu, Zhejiang, Henan and Jiangxi. These regions support manufacturers of epoxy fiberglass laminates, copper-clad boards, insulation parts, electrical equipment, battery components and CNC-machined industrial products.

This supply-chain concentration provides several practical advantages:

- Broad availability of G10, FR4, G11, FR5, ESD and epoxy fiberglass laminate grades

- Flexible sheet thicknesses, panel dimensions and color options

- Competitive production costs for standard and customized orders

- Established export experience for industrial materials

- Access to CNC cutting, drilling, routing and finished insulation-part processing

- Easier coordination between material suppliers, machine shops and equipment manufacturers

China's large electrical and mechanical manufacturing sector also supports the long-term availability of related raw materials, processing services and export logistics.

How We Evaluated Black G10 Sheet Manufacturers

The companies below were selected using practical purchasing criteria rather than marketplace visibility alone. A reliable supplier should be evaluated according to manufacturing capability, material consistency, documentation quality and communication efficiency.

Evaluation Area	What Buyers Should Review	Why It Matters
Manufacturing specialization	Whether the company produces epoxy fiberglass laminates or only resells them	Direct manufacturers usually have stronger control over pressing, resin formulation and thickness stability
Product range	Availability of G10, FR4, G11, FR5, ESD grades and machined parts	A broader product range may indicate stronger technical knowledge
Production capacity	Factory size, press capacity, monthly output and raw-material inventory	Capacity affects lead-time consistency and repeat-order reliability
Quality control	Incoming material inspection, thickness checks, dielectric testing and lot traceability	Helps reduce batch variation and material substitution risk
Certification management	ISO, UL, RoHS, REACH or customer-required documentation	Documentation should match the exact material grade and order
Custom service	Cut-to-size, CNC machining, drilling, color selection and packaging	Important for OEM projects and finished industrial components
Export readiness	English communication, shipping documentation and export-grade packaging	Reduces delays, misunderstandings and transit damage

G10, FR4 and Black Epoxy Fiberglass Sheet: Key Differences

G10 and FR4 are both epoxy resin–impregnated glass cloth laminates. They are widely used where electrical insulation, mechanical strength and dimensional stability are needed.

The most important distinction is flame retardancy.

- G10 generally refers to a glass-epoxy laminate and may not always be specified as flame retardant.

- FR4 is typically used for flame-retardant epoxy fiberglass laminate grades.

- G11 and FR5 are generally selected for applications requiring higher thermal resistance.

- ESD G10 or ESD FR4 materials are engineered for applications requiring controlled static dissipation.

- Black G10 Sheet may refer to standard black G10, black FR4, black ESD laminate or a custom-colored epoxy fiberglass board.

Buyers should not assume that a black sheet is automatically flame-retardant, anti-static or high-temperature resistant. The purchase specification should clearly state the required grade, thermal rating, electrical properties, thickness tolerance and compliance documents.

Black G10 Sheet Material Structure

Top 10 Black G10 Sheet Manufacturers in China

The following companies represent a practical sourcing shortlist for buyers of Black G10 Sheet, FR4 Sheet, G11 Sheet and custom-machined epoxy fiberglass components. The order reflects overall relevance for industrial buyers, customization capability and material specialization rather than a universal ranking.

1. Guangdong Weishi New Materials Co., Ltd.

Location: Guangdong, China

Established: 2007

Main Products: FR4 fiberglass sheets, epoxy resin sheets, Black G10-related materials, anti-static sheets, copper-clad laminates, high-density composite sheets and engineering plastics

Suitable For: Industrial equipment manufacturers, battery-pack suppliers, electrical-component producers, machinery companies and OEM buyers

Customization: Sheet thickness, panel size, color, CNC-ready blanks, drilled parts, machined insulation components and project-specific packaging

Guangdong Weishi New Materials Co., Ltd. is a specialized manufacturer of epoxy fiberglass insulation sheets and composite materials. The company has built its product range around FR4 sheets, epoxy resin boards, anti-static insulation materials and customized composite solutions for industrial applications.

For buyers seeking a long-term manufacturing partner rather than a basic stock supplier, Weishi is particularly suitable for projects requiring flexible communication and practical customization support. Its strength lies in serving customers that need more than standard sheet dimensions, including custom thickness requirements, black epoxy fiberglass materials, machined blanks, CNC processing support and tailored packaging.

The company is a suitable option for small and medium-sized industrial brands, equipment manufacturers and buyers developing new products. Instead of forcing every customer into a fixed catalog format, it can support applications where material dimensions, electrical insulation performance, mechanical strength and processing requirements need to be discussed before production.

Typical applications include:

- Battery-pack insulation barriers and structural components

- Electrical insulation panels and busbar supports

- CNC-machined fixtures and jigs

- Industrial machine parts

- Mold and tooling components

- Transformer, motor and switchgear insulation parts

- High-strength composite components for mechanical processing

Core Strengths

- Manufacturing experience in epoxy fiberglass insulation materials

- Flexible OEM and custom processing support

- Suitable for both developing projects and repeat industrial orders

- Broad portfolio covering FR4, anti-static boards and composite sheets

- Responsive communication for custom specifications

- Practical support for buyers that require machining or conversion after lamination

2. Guangzhou Shengrui Insulation Materials Co., Ltd.

Location: Guangdong, China

Established: 2012

Main Products: FR4/G10 laminates, multicolor G10, FR5/G11 laminates, ESD FR4/G10, 3240 sheets, copper-clad laminates, prepregs and carbon-fiber products

Suitable For: Buyers needing multiple insulation-material types from one supplier

Customization: Custom colors, dimensions, CNC machining, insulation components and carbon-fiber part processing

Guangzhou Shengrui Insulation Materials Co., Ltd. offers a broad range of industrial laminate materials. Its portfolio includes G10, FR4, G11, FR5, ESD materials, 3240 boards, prepregs and carbon-fiber products.

This makes the company relevant for buyers that want to source multiple engineering materials through one supplier. It may be particularly useful for projects involving electrical insulation boards, mechanical composite parts, anti-static materials and CNC-machined components.

The availability of multicolor G10 may also be useful for customers that require color differentiation, visual identification or custom appearance in finished components.

Core Strengths

- Broad range of epoxy fiberglass and composite materials

- Availability of ESD and high-temperature laminate grades

- Custom color options for G10 materials

- CNC machining support for finished components

- Suitable for buyers managing mixed-material projects

3. Zhejiang Jingjing Insulation Materials Co., Ltd.

Location: Zhejiang, China

Main Products: Black ESD epoxy fiberglass sheets, FR4, G10, FR5, G11, 3240 sheets, prepregs and insulation accessories

Suitable For: Battery, transformer, electrical-equipment and anti-static industrial applications

Customization: Thickness, sheet size, anti-static performance and custom insulation components

Zhejiang Jingjing Insulation Materials Co., Ltd. is relevant for buyers who need anti-static epoxy fiberglass sheet products in addition to standard G10 or FR4 boards. Its material range includes black ESD laminate sheets designed for electrical, electronic and battery-related applications.

For buyers in lithium battery, electronics assembly, electrical power equipment and transformer manufacturing, the company may be considered when static-control requirements are important. A black ESD board should always be specified according to measurable resistance requirements rather than visual appearance alone.

Core Strengths

- Focus on anti-static epoxy fiberglass materials

- Product range includes G10, FR4, FR5 and G11

- Suitable for electrical and battery-related applications

- Availability of thicker insulation-board options

- Potential fit for customers requiring controlled ESD performance

4. Youda Insulation

Location: China

Main Products: G10 epoxy sheets, colored epoxy fiberglass sheets and custom laminate materials

Suitable For: Mechanical component manufacturers, industrial tooling users and buyers requiring custom color options

Customization: Black, green, yellow, red, white and other color options; custom thicknesses and dimensions

Youda Insulation offers G10 epoxy sheets in different colors, including black. This makes the company relevant for buyers whose requirements include visual differentiation, custom colors or project-specific material appearance.

While black G10 is commonly used for insulation and mechanical parts, colored laminate sheets are also used in industrial fixtures, knife-handle materials, tooling elements, mechanical spacers and equipment panels.

Buyers should clarify whether a required color is cosmetic, through-colored, anti-static or related to a specific resin formulation.

Core Strengths

- Custom color options for G10 sheets

- Suitable for standard and custom sheet orders

- Useful for visual identification and branding-related applications

- Potential fit for mechanical and industrial composite parts

5. Wuxi Different Plastic Co., Ltd.

Location: Jiangsu, China

Main Products: Black G10 sheet, EPGC201 laminate materials and high-voltage epoxy fiberglass boards

Suitable For: Solar systems, electrical equipment, high-voltage components and industrial insulation projects

Customization: Thickness range, custom dimensions and application-specific panel formats

Wuxi Different Plastic Co., Ltd. is associated with Black G10 and epoxy fiberglass laminated sheet products positioned for solar and high-voltage applications. The company may be relevant for buyers requiring thicker sheet materials or insulation boards used in electrical equipment.

For high-voltage applications, buyers should validate more than the nominal voltage claim. Material performance depends on thickness, humidity, surface condition, geometry, creepage distance, clearance distance and operating environment.

Core Strengths

- Product positioning for high-voltage and solar applications

- Black epoxy fiberglass laminate options

- Potential suitability for thicker insulation boards

- Relevant for electrical-equipment and industrial-system buyers

6. Beijing Shine Universe Science and Technology Co., Ltd.

Location: Beijing, China

Main Products: FR4 sheets, G10 sheets, SMC fiberglass boards and composite materials

Suitable For: Electronics, industrial component manufacturing and specialized composite applications

Customization: Thin sheets, custom dimensions, material selection and specialized product configurations

Beijing Shine Universe Science and Technology Co., Ltd. supplies FR4, G10 and SMC fiberglass materials for industrial and electronics-related applications. The company may be worth considering for buyers seeking thinner epoxy fiberglass laminates or alternative composite material options.

For specialized applications, buyers should request full technical data covering thermal performance, mechanical strength, dielectric properties, water absorption and processing behavior.

Core Strengths

- Broad composite-material offering

- Potential suitability for thinner laminate requirements

- Relevant for electronics and industrial component projects

- Custom material and format options

7. Henan Jinzhi Electrical Insulation New Material Co., Ltd.

Location: Henan, China

Main Products: FR4 sheets, G10 sheets, 3240 epoxy sheets and electrical insulation boards

Suitable For: Motor manufacturers, transformer producers, battery-insulation suppliers and industrial electrical-component buyers

Customization: Sheet color, thickness, dimensions and standard insulation-board conversion

Henan Jinzhi Electrical Insulation New Material Co., Ltd. focuses on commonly used electrical insulation laminate materials, including FR4, G10 and 3240 boards. Its product range may suit buyers seeking standard insulation sheets for electrical, motor and battery-related applications.

This type of supplier can be relevant for routine industrial supply programs where standard grades, repeat dimensions and consistent material availability are the main priorities.

Core Strengths

- Focus on standard electrical insulation board grades

- Suitable for motor, transformer and electrical-equipment applications

- Black and green epoxy fiberglass sheet options

- Practical fit for repeat sheet-material orders

8. Jiujiang Xinxing Fiberglass Material Co., Ltd.

Location: Jiangxi, China

Main Products: FR4, G10, G5, G9 and fiberglass-based insulation materials

Suitable For: Buyers comparing multiple insulation-material grades and resin systems

Customization: Sheet sizes, thicknesses and material selection for different industrial applications

Jiujiang Xinxing Fiberglass Material Co., Ltd. offers several fiberglass-based insulation materials, including FR4, G10, G5 and G9. This product range may benefit buyers that need to compare different material grades before selecting the best option for their application.

Rather than treating every epoxy fiberglass board as interchangeable, procurement teams should compare the relevant resin system, thermal class, dielectric strength, water absorption, flexural strength and machining behavior.

Core Strengths

- Broad range of fiberglass insulation materials

- Relevant for multi-grade material comparison

- Suitable for industrial machinery and electrical insulation applications

- Potential option for buyers requiring alternative laminate grades

9. Suzhou Wanrun Insulation Material Co., Ltd.

Location: Jiangsu, China

Main Products: FR4 sheets, G10 sheets, 3240 boards and electrical insulation materials

Suitable For: Buyers requiring regular industrial insulation-board supply

Customization: Standard sheets, cut-to-size formats and routine material conversion

Suzhou Wanrun Insulation Material Co., Ltd. supplies standard electrical insulation boards and epoxy fiberglass materials. It may be suitable for buyers requiring conventional FR4, G10 and 3240 sheet products for regular replenishment orders.

Before finalizing a supplier, buyers should clarify whether the company controls the lamination process internally or works mainly as a converter, distributor or trading supplier. This distinction may affect technical consistency, lead-time control and the ability to resolve material-quality issues.

Core Strengths

- Standard electrical insulation material supply

- Suitable for repeat orders of common sheet grades

- Relevant for machinery, electrical equipment and industrial component manufacturing

- Potential cut-to-size service for standard applications

10. Beijing Red Sun Technology Co., Ltd.

Location: Beijing, China

Main Products: FR4 sheets, G10 sheets, epoxy fiberglass boards and CNC-machined insulation components

Suitable For: Buyers requiring both raw sheets and finished insulation parts

Customization: CNC cutting, drilling, routing, custom profiles and machined components

Beijing Red Sun Technology Co., Ltd. is relevant for buyers who prefer to source raw epoxy fiberglass sheets and finished machined parts from the same supplier. This can reduce the number of supply-chain steps for projects involving custom insulation panels, electrical bases, motor components and equipment housings.

Buyers should assess raw-sheet quality and machining capability separately. A supplier may provide accurate CNC machining but use externally sourced material, so it is important to clarify the origin and grade of the raw laminate before approval.

Core Strengths

- Combination of epoxy fiberglass sheet supply and CNC processing

- Suitable for finished insulation components

- Useful for buyers needing drilled, routed or custom-profiled parts

- Relevant for electrical and mechanical assemblies

China Black G10 Sheet Factory Production

Manufacturer Comparison: Capacity, MOQ and Certifications

Published information on capacity, minimum order quantity and certification scope varies widely across manufacturers. The table below is intended as a starting point for supplier discussions. Buyers should request written confirmation for the specific grade, thickness and order quantity required.

Manufacturer	Capacity or Scale	MOQ Approach	Certification and Compliance Review	Best Fit
Guangdong Weishi New Materials Co., Ltd.	More than 16,000 m² facility; over 100 tonnes monthly output	Quote-based; suitable for custom and repeat orders	Request material-specific test reports and compliance documents	OEM projects, custom sheets, battery and industrial applications
Guangzhou Shengrui Insulation Materials	Verify factory scale directly	Quote-based	Verify ISO, RoHS, REACH and flame-retardancy scope	Multi-material sourcing and CNC parts
Zhejiang Jingjing Insulation Materials	Verify factory scale directly	Quote-based	Request ESD test results, RoHS and REACH documents	ESD, electrical and battery applications
Youda Insulation	Verify factory scale directly	Quote-based	Verify documentation based on required material grade	Colored and custom G10 sheet projects
Wuxi Different Plastic	Verify factory scale directly	Quote-based	Request high-voltage test reports and thickness-specific data	Solar and high-voltage insulation
Beijing Shine Universe	Verify factory scale directly	May support smaller customized orders	Verify documentation for exact material grade	Electronics and specialized composite projects
Henan Jinzhi	Verify factory scale directly	Standard-sheet MOQ structure	Verify quality-system and material documents	Standard electrical insulation boards
Jiujiang Xinxing	Verify factory scale directly	Quote-based	Request technical data for each laminate grade	Multi-grade insulation-material comparison
Suzhou Wanrun	Verify factory scale directly	Standard product MOQ structure	Verify whether material is factory-produced or sourced externally	Routine sheet-material procurement
Beijing Red Sun Technology	Verify factory scale directly	Quote-based	Verify raw-material source and machining inspection process	CNC-machined insulation components

What to Include in a Black G10 Sheet Specification

A complete purchasing specification should contain more than the phrase "Black G10 Sheet, 3 mm." Incomplete specifications increase the risk of material substitution, inconsistent performance and disputes during incoming inspection.

Include the following details:

- Material grade: G10, FR4, G11, FR5, ESD FR4 or another required material

- Resin system and reinforcement structure

- Flame-retardancy requirement, if applicable

- Thermal rating and operating-temperature range

- Sheet thickness and allowable tolerance

- Length and width dimensions

- Flatness requirement

- Surface finish: smooth, matte, polished, textured or protective-film finish

- Color requirement: black through-color, surface color or ESD black

- Electrical requirements: dielectric strength and insulation resistance

- Mechanical requirements: flexural strength, compressive strength and impact behavior

- Water-absorption limits for humid environments

- Surface resistivity or volume resistivity for anti-static applications

- RoHS, REACH, halogen-free or customer-specific compliance requirements

- Required documentation, including certificate of conformity and batch traceability

- Packaging standards for export shipping

Common Black G10 Sheet Sourcing Problems

Confusing G10 with FR4

Some suppliers use "G10/FR4" as a general product description. This may be acceptable for a broad initial inquiry, but not for a final purchase order. If flame retardancy is mandatory, specify FR4 and define the required flame-retardant documentation.

Assuming Black Means ESD

Black color does not automatically mean anti-static performance. A standard black G10 sheet and a black ESD FR4 sheet may look similar but have very different surface-resistance properties.

Ignoring Thickness Tolerance

A sheet specified as 3.0 mm may not be suitable if the actual thickness varies beyond the tolerance required by your design. This is especially important for battery-pack spacers, press-fit parts, machined fixtures and electrical clearance components.

Approving Only a Small Sample

A small polished sample may not reveal warpage, internal voids, thickness inconsistency or machining defects that appear on full production sheets. Always inspect full-size production samples when sheet flatness and machining performance matter.

Accepting Generic Certificates

A general ISO certificate or a RoHS statement for another product line does not prove that the specific Black G10 Sheet grade meets your requirements. Request documents that clearly identify the product grade, test method and applicable scope.

An Important Material Inspection Tip

Black epoxy fiberglass sheets can conceal surface irregularities more effectively than light green, yellow or natural-color sheets. Dark pigmentation can make it harder to identify resin-rich areas, glass-weave irregularities, sanding differences, minor voids and localized discoloration.

To reduce this risk, buyers should request the following during sampling and incoming inspection:

- A cut cross-section sample from the required thickness

- Edge inspection for delamination and internal voids

- Thickness readings from corners, center and multiple edge points

- Flatness measurements across the full panel

- A machining trial using the intended drilling, routing or CNC process

- Surface inspection under strong direct lighting

- Lot number and production-batch identification on packaging

- A retained sample for future comparison

For industrial applications, a lower-priced sheet can become expensive if it causes excessive tool wear, edge chipping, delamination, assembly rejection or downtime during processing.

Black G10 Sheet Quality Inspection

Buyer's Guide for Supplier Qualification

Verify the Actual Manufacturer

Ask for the legal company name, factory address, business registration details, production-line photos, workshop videos and export documentation examples. Confirm whether the supplier owns the lamination process or purchases finished sheets from another source.

A direct manufacturer is not always the only suitable option, but buyers should understand who controls resin formulation, pressing, quality inspection and production scheduling.

Check ISO Certification Validity

To verify whether an ISO certificate is current:

1. Request the complete certificate rather than a partial image.

2. Check the certificate number, issuing body, company name, factory address, scope and expiry date.

3. Confirm that the factory address matches the actual production site.

4. Review whether the certificate scope is relevant to insulation laminates or composite-material manufacturing.

5. Verify the certificate through the issuing body's official directory or direct contact channel.

6. Confirm that the legal entity on the certificate matches the entity issuing your commercial invoice.

Use a Staged Sampling Process

A structured sample process reduces the risk of approving unsuitable material.

1. Send a written technical specification and drawings.

2. Request a material datasheet and formal quotation.

3. Obtain a sample in the intended grade, color and thickness.

4. Perform incoming inspection and required laboratory testing.

5. Conduct a machining, drilling or assembly trial.

6. Approve a signed golden sample.

7. Place a pilot order before committing to large-volume production.

8. Compare pilot-order material against the approved sample.

9. Establish batch-inspection requirements for repeat orders.

Prepare for Shipping and Storage

Black G10 sheets are rigid, heavy and vulnerable to edge damage, moisture exposure and warpage when improperly supported.

Specify the following shipping requirements:

- Export-grade plywood pallets or reinforced cartons

- Full-sheet support to prevent bending

- Corner protectors and moisture-resistant packaging

- Clear labels showing grade, thickness, quantity and lot number

- Separate packaging for different grades and thicknesses

- Packing lists matched to the purchase-order number

- Agreed Incoterms and cargo-insurance responsibilities

- Destination-country compliance requirements before shipment

Conclusion

China offers a broad manufacturing base for Black G10 Sheet, FR4 Sheet, G11 Sheet, ESD epoxy fiberglass board and custom-machined insulation components. The most suitable supplier is not simply the one offering the lowest initial price. A reliable partner should demonstrate material consistency, clear communication, documented quality control, stable delivery performance and the ability to support your actual application requirements.

For buyers that require flexible custom service, efficient communication, composite-material expertise and dependable support for OEM projects, Guangdong Weishi New Materials Co., Ltd. is a practical manufacturer to include in a supplier evaluation program. Its focus on epoxy fiberglass insulation boards, anti-static materials, custom specifications and industrial applications makes it suitable for buyers developing new products as well as companies managing ongoing procurement requirements.

A well-defined technical specification, staged sample validation process and consistent incoming inspection program will help buyers build a more reliable Black G10 Sheet supply chain.

Frequently Asked Questions

Is Black G10 Sheet the same as Black FR4 Sheet?

Not always. Both may use epoxy resin and woven glass cloth, but FR4 is generally specified as flame-retardant, while G10 may not have the same flame-retardant requirement. Confirm the exact material grade, flame classification and test documentation before ordering.

How can I verify that a supplier's ISO certificate is still valid?

Request the full certificate and check the issue date, expiry date, certificate number, issuing body, legal company name, factory address and scope. Then verify the certificate through the issuing organization's official database or customer-service channel.

What is the correct way to specify an ESD Black G10 Sheet?

Define the required surface resistivity or volume resistivity range, test standard, test conditions, thickness, surface finish and acceptable tolerance. Do not rely on the word "anti-static" alone.

Can Black G10 Sheet be used for high-voltage electrical insulation?

It can be used in many electrical-insulation applications, but suitability depends on the material grade, thickness, dielectric strength, moisture exposure, operating temperature, creepage distance, clearance distance and part geometry. Engineering validation is required for every final application.

How can buyers avoid material substitution during production?

Include the exact material grade, thickness tolerance, dimensions, surface finish, color, electrical requirements, flame-retardancy requirements and documentation requirements in the purchase order. Retain an approved golden sample, require lot traceability and inspect every incoming shipment.