Epoxy Fiberglass Sheet Manufacturers

Epoxy Fiberglass Sheet Manufacturer with Full Process Control

As a Epoxy Fiberglass Sheet Manufacturers, we match product configuration to the application, operating limits, interfaces and acceptance criteria defined for each project.

Jiangyin Dongli New Materials Technology Co., Ltd. is a China-based Epoxy Fiberglass Sheet manufacturer and supplier that produces high-performance thermosetting insulation laminates for electrical, electronic, and new-energy applications. From our 32,000-square-meter facility in Jiangyin, we control every step—from E-glass fabric weaving and epoxy resin formulation to hot-press lamination, precision cutting, and final inspection—so each sheet meets the dimensional, electrical, and flame-retardant requirements your project demands.

Our epoxy fiberglass sheets are manufactured from woven E-glass fabric impregnated with brominated epoxy resin, offering excellent electrical insulation, heat resistance, and mechanical toughness. They are widely used as insulating structural parts in lithium battery packs, PCB test fixtures, switchgear, busbar supports, transformer spacers, and motor slot wedges. We supply standard sheets and custom sizes, with options for thickness, color, and surface finish.

Product Range and Application Fit

Our current epoxy fiberglass sheet line is centered on FR-4 grade laminate, available in standard and custom configurations. The flagship product is the yellow epoxy fiberglass sheet (1240×1040 mm), but we can produce sheets in a range of dimensions and thicknesses to suit your specific tooling or insulation design.

We also offer Custom Yellow Epoxy Fiberglass Sheet 1240×1040×1mm as a standard product, which can be customized in size and thickness for volume orders.

Material and Performance Characteristics

Our epoxy fiberglass sheets are made from woven E-glass fabric and brominated epoxy resin, giving them a compact texture, high flatness, and stable dimensions. The yellow pigmentation is added during resin formulation for easy visual identification in electrical assemblies.

• Electrical insulation: Dielectric strength 20–28 kV/mm, volume resistivity 10⁷–10⁸ MΩ·cm, dissipation factor 0.015–0.02 @1MHz.
• Thermal performance: Continuous operating temperature 130°C (Class B), short-term peak 150°C (30 min), thermal conductivity 0.25–0.35 W/(m·K).
• Flame retardancy: UL94 V-0 self-extinguishing, suitable for high-safety applications.
• Mechanical toughness: Good impact strength and machinability, compatible with CNC milling, drilling, and punching.
• Low water absorption: Below 0.15% after 24 hours immersion, ensuring dimensional stability in humid environments.

These properties make our sheets suitable for both electrical insulation and structural support in demanding environments.

Configuration and Customization

We understand that every project has unique dimensional and performance requirements. Our factory can produce epoxy fiberglass sheets in custom sizes, thicknesses, and tolerances. Whether you need a standard 1240×1040 mm sheet or a non-standard shape, we can cut, route, or machine the material to your specifications.

For high-volume production, we offer consistent quality with batch-to-batch repeatability. Our in-house cutting equipment ensures clean edges and precise dimensions, reducing your secondary processing time.

Quality Assurance and Testing

All sheets are inspected per IPC-4101 standards. Dielectric strength is tested per ASTM D149, and we provide a certificate of conformance with each shipment. Our quality control includes dimensional checks, visual inspection, and electrical testing to ensure compliance with your specifications.

We operate a 10KN microcomputer-controlled mechanical testing machine for composite materials, allowing us to verify mechanical properties in-house. Our factory is ISO 9001:2015 certified, reflecting our commitment to quality management.

Machining and Handling Recommendations

To achieve the best results when machining our epoxy fiberglass sheets, we recommend using carbide tools with a feed rate of 0.05–0.10 mm/rev and spindle speed of 20,000–40,000 RPM. Always support the sheet fully during machining to prevent vibration and edge chipping.

The material is resistant to acetone, ethanol, and oils, but should not be exposed to concentrated sulfuric acid or strong alkalines. It can withstand thermal cycling from -40°C to 130°C with warpage below 0.3% after 100 cycles.

Information We Use to Configure Your Solution

To prepare an accurate quotation and technical proposal, we need the following project details:

• Required dimensions (length, width, thickness) and tolerance
• Quantity and delivery schedule
• Application context (e.g., lithium battery insulation, PCB fixture, switchgear)
• Electrical and thermal performance requirements
• Any special certifications or test reports needed
• Color preference (standard yellow or custom)

With this information, we can recommend the appropriate grade, thickness, and processing method to meet your performance and cost targets.

FAQs

What is the minimum order quantity for custom epoxy fiberglass sheets?

We accommodate both small prototype orders and large production runs. For custom sizes, please contact us with your requirements, and we will provide a tailored quotation.

Can you provide sheets with different thicknesses beyond 1 mm?

Yes, we can produce epoxy fiberglass sheets in a wide range of thicknesses, typically from 0.5 mm to 50 mm. Our hot-press process allows precise control of thickness tolerance.

Do you offer cutting or machining services?

We offer cutting to size and can perform simple machining operations. For complex shapes, we can provide CNC-machined parts upon request.

What certifications do your epoxy fiberglass sheets have?

Our sheets meet UL94 V-0 flammability and are inspected per IPC-4101. We provide a certificate of conformance and can supply test reports for dielectric strength and other properties.

How do you ensure consistent quality across large orders?

Our production process is fully controlled in-house, from raw material selection to final inspection. We use calibrated testing equipment and follow strict QC procedures to ensure batch-to-batch consistency.

Related Products and Categories

Our portfolio also includes Lightweight Rigid Carbon Fiber Texture Takeout Delivery Box for applications with different operating ranges, interfaces or integration requirements.