Fibre Glass Epoxy Components
Fibre glass epoxy components are precision-engineered insulation parts used in electrical and industrial equipment where both dielectric performance and mechanical strength are critical. ACC Insulations manufactures high-quality fibre glass epoxy components to exacting specifications for transformer, motor, and switchgear manufacturers across India.
We work with industry-standard materials including NEMA G10, G11, FR4, and FR5. Our CNC fabrication process ensures that these glass cloth reinforced epoxy parts maintain their mechanical integrity, high arc resistance, and stable dielectric properties even in high-humidity, high-temperature, or chemically aggressive environments.
What Are Fibre Glass Epoxy Components?
Fibre glass epoxy components are precision-machined parts produced from epoxy laminate sheets (G10, G11, FR4, FR5) reinforced with woven glass cloth fabric. The epoxy resin matrix bonds the glass layers together, creating a rigid composite that combines excellent electrical insulation with high mechanical strength — properties that cannot be achieved with either material alone.
Product Specifications
| Fibre Glass Epoxy Components — Technical Specifications | |
|---|---|
| Technical Grades | NEMA G10, G11, FR4, FR5 / EPGC 201, 202, 203 |
| Thickness Range | 0.8 mm – 50 mm |
| Shape & Size | As per customer engineering drawing |
| Machining Tolerance | ±0.05 mm |
| Flame Resistance | UL 94-V0 Rated |
| Thermal Endurance | Class F (155°C) to Class H (180°C) |
| Available Colours | Lemon Yellow, Golden Yellow, Natural, Green |
| Usage | Transformers, Motors, Switchgear, Electrical Panels |
| Standards | IEC 60893, IS 13529, NEMA LI-1, UL 94-V0 |
Understanding Epoxy Laminate Grades
Choosing the correct grade of glass epoxy laminate is critical to long-term component performance. Here is a quick guide to the grades we supply:
G10
General-purpose glass epoxy laminate. High mechanical and dielectric strength. Suitable for room-temperature to moderate heat applications. Not flame-retardant.
G11
High-temperature grade with superior flexural strength retention above 130°C. Ideal for motor slot wedges, dry-type transformer components, and Class H applications.
FR4
Flame-retardant variant of G10. UL 94-V0 rated. The most widely used grade in switchgear, electrical panels, and PCB-adjacent industrial applications.
FR5 / G11-FR
Combines the high-temperature performance of G11 with flame retardancy. Best suited for demanding environments requiring both thermal endurance and fire safety compliance.
Key Properties
- High dielectric strength — reliable electrical insulation under sustained high-voltage conditions
- Mechanical rigidity and durability — withstands clamping loads, short-circuit forces, and vibration
- Thermal stability — maintains performance from Class F (155°C) to Class H (180°C)
- Moisture and chemical resistance — stable in humid, oily, and chemically aggressive environments
- High arc resistance — resists electrical tracking and surface discharge in high-voltage applications
- Flame retardancy — UL 94-V0 rated grades self-extinguish and do not propagate flame
- Long service life — dimensional stability maintained across thermal cycling and mechanical load cycles
Features
- Woven fiberglass fabric reinforcement — glass cloth layers bonded with epoxy resin for maximum inter-laminar shear strength
- Epoxy resin binder system — provides superior adhesion, chemical resistance, and dielectric performance
- Weather and UV resistance — suitable for indoor and protected outdoor electrical enclosures
- Cost-effective versus metallic alternatives — lighter, easier to machine, and inherently non-conductive
- Colour-coded by grade — easy visual identification of material grade on the production floor
Components We Manufacture
ACC Insulations produces a comprehensive range of precision epoxy insulation components including:
- Stator slot wedges — for securing motor windings in stator slots, preventing movement under electromagnetic forces
- Busbar supports and insulators — maintaining safe phase clearances in switchgear and distribution panels
- Terminal boards and connection blocks — providing insulated connection points in transformers and motors
- Phase barriers and phase separators — electrically isolating phases in switchgear enclosures and motor terminal boxes
- Arc chutes and arc splitter plates — for interrupting and extinguishing arcs in contactors and circuit breakers
- Insulation spacers and distance pieces — maintaining critical clearances between live conductors
- Custom machined profiles — complex shapes, slots, holes, and contoured edges per customer drawing
Applications
Fibre glass epoxy insulation components from ACC Insulations are used in:
- Power and distribution transformers — terminal boards, lead supports, and inter-winding spacers
- Electric motors and generators — stator slot wedges, phase insulation, and end-winding support rings
- Switchgear and MCC panels — busbar supports, phase barriers, arc chutes, and insulating barriers
- Dry-type transformers — high-temperature Class H components for cast resin and VPI designs
- Industrial electrical equipment — custom insulation components developed to unique OEM specifications
Manufacturing Capabilities
ACC Insulations operates advanced CNC machining and fabrication facilities capable of producing fibre glass epoxy components with consistent quality and tight dimensional tolerances:
- CNC machining centres for complex 2D and 3D profiles
- Precision milling, drilling, and routing equipment
- Custom tooling and fixturing for repeat production runs
- In-process dimensional verification to ±0.05 mm tolerance
- Prototyping from customer drawings — first-article inspection before production
Quality Assurance
Every fibre glass epoxy component leaving ACC Insulations undergoes multi-stage quality verification:
- Dimensional inspection — verifying all critical dimensions against customer drawings
- Electrical performance testing — dielectric withstand and insulation resistance checks
- Mechanical strength verification — flexural and compressive strength testing on representative samples
- Visual and surface inspection — checking for delamination, edge chipping, or surface defects
All products are manufactured in compliance with IEC 60893, IS 13529, NEMA LI-1, and customer-specified quality plans.
Standards and Compliance
- IEC 60893 — Insulating boards of thermosetting resin and industrial laminates
- IS 13529 — Indian Standard for glass fabric reinforced epoxy laminates
- NEMA LI-1 — Industrial laminated thermosetting products standard
- UL 94-V0 — Flame retardancy classification (FR4, FR5 grades)
- Customer-specific OEM and transformer design standards accepted
Custom Design & Engineering Support
ACC Insulations works directly with OEM design and procurement teams to deliver fibre glass epoxy components that are optimised for their specific application:
- DFM (design for manufacturing) review of customer drawings before production
- Material grade selection guidance based on thermal class, voltage, and environment
- Prototype development and first-article approval
- Volume production with consistent quality and on-time delivery
Why Choose ACC Insulations?
- Proven expertise manufacturing precision epoxy insulation components for OEM electrical manufacturers
- Full CNC machining capability — complex shapes to ±0.05 mm from customer drawings
- All major grades in stock: G10, G11, FR4, FR5, EPGC 201/202/203
- IEC, IS, and NEMA standard compliance with documented quality records
- Flexible batch sizes — from prototype quantities to full production volumes
- Reliable supply and technical support for the entire component lifecycle
Engineering Tools Suite
Calculate exact dielectric tolerances, thermal stability margins, and thickness requirements for your custom fibre glass epoxy components using our interactive insulation tools.
Frequently Asked Questions
Fibre glass epoxy components are precision-machined insulation parts used in power transformers, electric motors, switchgear panels, and industrial electrical equipment. Common parts include stator slot wedges, busbar supports, terminal boards, phase barriers, arc chutes, and spacers — anywhere reliable electrical insulation combined with mechanical strength is required.
G10 is a general-purpose glass epoxy laminate with high mechanical and dielectric strength, suitable for ambient to moderate temperature applications. G11 is a high-temperature grade with superior flexural strength at elevated temperatures. FR4 is a flame-retardant version of G10, rated UL 94-V0 — the most widely used grade in electrical panels and switchgear. All three use glass cloth reinforced with epoxy resin binders.
Yes. ACC Insulations operates CNC machining centres, precision milling, and drilling equipment capable of producing custom epoxy components to your exact engineering drawings. We achieve machining tolerances of ±0.05 mm and can produce complex profiles, slots, holes, and contoured shapes from G10, G11, FR4, and FR5 laminates.
Our components use high-grade epoxy resin binders reinforced with woven glass cloth fabric. The epoxy resin system provides excellent bonding between glass layers, high arc resistance, and resistance to moisture and chemicals — ensuring consistent electrical and mechanical performance across the service life of the component.
Our fibre glass epoxy components are manufactured in compliance with IEC 60893, IS 13529, and NEMA LI-1 standards. Flame retardant grades meet UL 94-V0. We can also produce to customer-specified standards for OEM transformer and motor manufacturers.
Our fibre glass epoxy components are available in thermal Class F (rated to 155°C) and Class H (rated to 180°C), making them suitable for high-temperature motor windings, dry-type transformers, and other demanding thermal environments.
