FR-5 Glass Epoxy Sheets Manufacturer in India
The FR5 sheet, commonly known as NEMA FR5, is a high-end fire-resistant laminate made of woven fiberglass cloth reinforced with epoxy resin. The FR-5 sheet can be considered as the fire resistant version of the G11 laminate. This high-performance fire retardant FR-5 epoxy glass laminate sheet is widely known among other FR5 laminate sheets for its combination of high-temperature resistance and fire compliance.
At Harnawa Inc., we specialize in the manufacturing of FR5 glass epoxy sheets in India and supply our fire-resistant laminates to all the transformer, switchgear, PCBs, and motor/generator OEMs in India with our international certification and pan-India deliveries from our Mumbai manufacturing facility.
What is FR-5 Glass Epoxy?
The FR-5 material is made from the same woven fiberglass cloth and epoxy resin used in other glass epoxy materials but with a special resin formula which provides both the flame-retardant and high-thermal properties. In other words, FR-5 can be called the fire-safety rated alternative of G11 because it has the same temperature resistance capability of the G11 as well as the self-extinguishing property.
High TG FR4 — Understanding the Upgrade Path
FR-5 is frequently looked for and sought after as the high TG FR4 equivalent – a laminate which possesses a higher glass transition temperature (Tg) than conventional FR-4 while still meeting the flame-retardant requirements. While conventional FR-4 starts losing its structural and dielectric properties as the temperature increases, FR-5 continues to demonstrate stable structural and electrical characteristics in the high temperature range, thus being a perfect material choice for a project that requires an upgrade from conventional FR-4.
Material Construction
FR-5 panels consist of woven fiberglass cloth laminated with epoxy resin to form several layers of rigid board. Such a construction provides the same strength and stability properties along with water resistance characteristics as any other glass epoxy material; however, the resin in this case is specially designed for high-temperature mechanical retention and fire resistance at once.
Working Temperature & Class H Insulation Sheet Suitability
The thermal stability of the FR-5 sheets produced by Harnawa Inc. is up to 140°C, providing consistent dielectric and mechanical characteristics in the process of work. This characteristic allows their use in applications that meet the criteria of the Class H insulation sheets, where the equipment should operate stably under the influence of high temperatures.
This makes the FR-5 sheets suitable for transformers, switchgears, and insulators working in harsh conditions of thermal and electrical stress.
Color Options
The FR-5 sheets are available in the customary yellow color, in keeping with the tradition within the industry when it comes to glass laminate sheets made from epoxy resin.
Thickness & Size Availability
FR-5 sheets can be obtained from Harnawa Inc. in customized thicknesses according to the requirements of your particular application, and also in cut-to-size sheets – saving you time on machining, reducing wastage of material, and expediting your delivery times.
FR5 PCB Material — Electronics-Grade Applications
FR-5 is further designated as FR5 PCB material in electronics industry application where thermal reliability is desired at a greater level than provided by regular FR-4 boards. Being a high TG epoxy sheet, FR-5 is capable of offering a substrate for PCB manufacturers that performs well under conditions of thermal cycling and elevated temperature processes related to lead-free soldering and harsh environment operation.
Typical Applications
The FR-5 glass epoxy laminate sheets have been widely specified for use in various industry and electrical applications, such as:
Switchgear Manufacturing
- Insulation for fire protection and increased heat resistance in switchgear compartments
- Insulation of busbar in high-cycle equipment
PCB (Printed Circuit Board) Production
- Materials used for substrate of highly reliable and highly temperature PCB assembly as FR5 PCB material of choice
- Multi-layer PCB exposed to elevated thermal cycling in production and usage
Transformer Production
- Insulating barriers and insulation of terminal boards for transformers subjected to continuous thermal loading
- Structures for dry-type and cast-resin transformers
Motor & Generator Insulation Parts
- Slot wedges and end windings support structure in motors & generators built for high temperatures
- Terminal block insulation and insulating spacers
Industrial Insulation Parts
- Insulating washers, bushings, and spacers used in equipment with harsh temperature applications
- Control cabinet and industrial electronics insulation parts
FR-5 vs FR-4 vs G11 — Choosing the Right Grade
| Property |
FR-4 |
FR-5 |
G11 |
| Base Construction |
Fiberglass + Epoxy |
Fiberglass + Epoxy |
Fiberglass + Epoxy |
| Working Temperature |
Up to 170°C |
140°C (rated), high-Tg formulation |
Up to ~200°C |
| Flame Retardancy |
Flame-retardant |
Flame-retardant |
Not flame-retardant |
| Color |
Yellow |
Yellow |
Yellow-green to amber |
| Best Suited For |
General fire-safety-critical applications |
Higher-Tg, fire-safety-critical applications (PCB, switchgear) |
High-temperature, non-fire-rated applications |
Takeaway point: FR-5 is the right specification if your application needs both fire safety compliance and a higher glass transition temperature than that of normal FR-4. G11, on the other hand, is the better choice if you need high heat resistance but do not require flame retardancy.
Building a Complete High-Reliability Insulation System
FR-5 sheets are frequently specified alongside other high-performance insulation materials to build a complete, fire-safety-compliant insulation system for transformers, motors, switchgear, and PCB assemblies:
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Aramid Papers — used for Class H slot lining and winding insulation, complementing FR-5 structural components in motor and generator assemblies
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Laminated Insulation Paper Composites — layered dielectric barrier materials used alongside FR-5 in transformer and motor construction
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Insulation Tapes High Temperature — used for coil binding and terminal insulation in assemblies incorporating FR-5 structural parts
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Fiberglass Insulation Sleeves — used to protect leads and connections routed through or near FR-5 panels
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Polyimide film — offering additional high-temperature dielectric wrapping in demanding assemblies
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Fiberglass yarn — used for lacing and mechanically reinforcing windings in high-reliability equipment
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Insulating Varnishes and Thinner — applied over windings and components to complete the dielectric protection system in transformer and motor builds using FR-5 structural insulation
Sourcing all of these materials from a single, certified supplier ensures compatibility, consistent quality standards, and simplified procurement for OEMs building fire-safety-compliant, high-reliability electrical equipment.
Quality & Certifications
Each lot of FR-5 glass epoxy sheets provided by us at Harnawa Inc. is produced using international standards of quality testing, based on:
- UL certification
- CE marking approval
- RoHS approval
- ISO 9001:2015 manufacturing standard
- REACH approval
Thus we ensure that our FR-5 sheets fulfill the requirement specifications of both the local Indian manufacturers as well as foreign OEMs for exports..
FR-5 Glass Epoxy Sheets Manufacturer in India — Why Choose Harnawa Inc.
Harnawa Inc. is known to be one of the most reputed manufacturers of FR5 Glass Epoxy Sheets in India that provides NEMA FR5 laminated sheets along with a variety of electrical insulating material products like transformers, motors, generators, switchgear, PCBs, etc.
What sets us apart:
- Reliable source of NEMA FR5 specification laminate sheets of 140°C operating temperature
- Complete customization of size and cut-to-size delivery
- Nationwide availability in Mumbai, Delhi, Pune, Ahmedabad, and more
- Compliant quality system certifications (UL, CE, RoHS, ISO 9001:2015, REACH)
- Exclusive supplier of FR-5 along with an exhaustive list of other insulating materials
Frequently Asked Questions
1.What is the working temperature of FR-5 glass epoxy sheets?
FR-5 glass epoxy sheets provided by Harnawa Inc. have the working temperature of 140°C, which is enough for constant industrial and electrical insulating purposes.
2.Is FR-5 the same as high TG FR4?
The use of FR-5 is common as the alternative of high-Tg FR-4 that provides enhanced thermal and mechanical retention with higher temperatures while remaining flame retardant.
3.Can FR-5 be used as FR5 PCB material?
Yes, FR-5 is used for PCBs production in the cases when there is a need for increased thermal resistance compared to standard FR-4 substrate.
4.What is the difference between FR-5 and G11?
FR-5 and G11 have a similar design of fiberglass-epoxy laminate; however, FR-5 is flame retardant while G11 is not. The maximum temperature of G11 is slightly higher (~200°C). However, FR-5 should be used when it is necessary to comply with fire safety regulations.
5.Can FR-5 sheets be custom cut to size?
Yes. Custom-made FR-5 sheets can be ordered with specified thickness and cutting to size.
