F Class Insulation Paper

F Class Insulation Paper Manufacturer & Supplier in India

Insulation paper of F class is a high-grade material which can provide excellent electrical insulation for applications up to 155°C temperature. Such insulators are frequently used in various kinds of motors, generators, transformers, electric devices, coils and other equipment which needs effective electrical and thermal insulation.

Harnawa Insulations is a manufacturer and supplier of electrical insulators in India. This company produces different insulation papers and laminates which can be used in various industrial purposes. For example, the AMA insulation paper manufactured by Harnawa Insulations is composed of Aramid + Polyester + Aramid and it is a real Class F insulation paper with 155°C heat resistance.

What Is F Class Insulation Paper?

F Class Insulation Paper is a material used in electrical insulation that is rated for use with a thermal class of up to 155°C under suitable operating conditions. It provides electrical insulation and separates active parts of the apparatus from one another in order to prevent electrical breakdowns and heat stresses.

However, the exact structure of F Class Insulation Paper depends on the intended use. One high-end construction of such a paper is laminated composite comprising Aramid Paper + Polyester Film + Aramid Paper. The Harnawa’s AMA insulation paper is made using the aforementioned laminated structure, thus combining thermal and mechanical qualities of Aramid Paper and insulating properties of Polyester film.

Such a composite is ideal in applications requiring flexible, durable, insulating and high temperature resistant material.

F Class Insulation Paper Construction

One of the F Class products of Harnawa is the AMA Insulation Paper. This material is made up of the following layers:

• Aramid Paper
• Polyester Film
• Aramid Paper

The polyester film is the middle layer of the composite and the aramid paper is laminated with both sides with an F Class adhesive. It is an ideal blend of properties such as thermal endurance, dielectric strength, flexibility, and mechanical stability.

As per the design needs, different thicknesses can be used. The AMA insulation paper of Harnawa is available in thicknesses of about 0.13 mm to 0.47 mm, depending on its grade.

Why Is F Class Insulation Paper Important?

Heat is produced by electrical apparatus while it is working. If the insulation cannot handle the temperature at which it works, then its durability is compromised.

F Class insulation has a high level of thermal capability and thus can be used for electrical apparatus that are meant to work under harsh temperatures.

A properly selected F Class insulation paper can help provide:

• Good electrical isolation
• Strong dielectric properties
• Thermal stability
• Physical protection
• Flexibility during manufacturing process
• Protection for winding elements
• Increased reliability of insulation system
• Uniform performance in electrical appliances

The actual performance depends on the construction, thickness, adhesive system, operating conditions, and complete insulation system.

Key Features of F Class Insulation Paper

1.155°C Thermal Class

The major feature of F Class insulation is that its thermal class is 155°C. Harnawa’s AMA insulation paper has been recognized as a 155°C Class F composite insulation paper for motor winding and electrical purposes.

2.Excellent Electrical Insulation Properties

The F class insulation paper is used as an insulator to provide electrical insulation for conductive materials. The dielectric properties make it possible to use the paper for electrical insulation in various electric devices such as motors and generators.

3.High Mechanical Strength

The aramid paper with a polyester film provides mechanical stability with maintaining elasticity which helps in winding, forming, inserting into slots, and other manufacturing operations.

4.Flexible Structure

Laminated insulation papers can be flexible materials that can be easily cut, bent, folded and inserted into narrow spaces. Thus, these materials can be useful in winding and slot insulation applications.

5.High Dielectric Properties

An electric insulation material should possess high dielectric strength. Depending on its thickness and grade, Harnawa’s AMA insulation paper has different breakdown voltage values.

6.Reliable Multi-layered Composite

The combination of aramid paper with the polyester film provides a multi-layered insulation construction.

Applications of F Class Insulation Paper

F Class Insulation Paper is used across several electrical and industrial applications.

Motor Winding Insulation

One of the widely used applications for this type of paper is motor winding insulation. It can be placed either around or between various winding components to create an electrical separation.

In addition to F Class laminated paper, Harnawa provides a wide variety of aramid papers that can be useful for electrical insulation applications.

Slot Insulation

Another application for which you can use F Class laminated paper is slot insulation in electric motors. Slot liners can protect winding from contact with the motor core and offer electrical insulation.

There are also other constructions of insulation paper offered by Harnawa for slot insulation Paper, phase insulation, and turn-to-turn insulation applications in motors.

Inter-Turn Insulation

Sometimes, insulation is required during production of motors and coils between the wire turns. F Class insulation paper can serve as inter-turn insulation.

Liner Insulation

Insulation liners can protect electrical windings and other conductive parts from any contact with surrounding parts. Flexibility of laminated insulation materials makes them good candidates for liners.

Transformer and Coil Insulation

Insulating materials play a vital role when manufacturing transformers and coils. These materials include various types of paper, film, laminate, and other types of insulating material based on the required temperatures.

Insulation kraft paper from Harnawa is also applicable for electrical use in transformer design and coating of conductors and layers.

Electrical Appliances

F Class insulating materials can also be utilized for electrical appliances that have a 155°C thermal class requirement.

F Class Insulation Paper for Motors and Generators

Insulation for electric motors and generators should be such that it is able to endure both electrical, mechanical, and thermal stresses. Thermal classification of insulation is essential since there will always be heating of the winding system while working.

F Class insulation paper can be used in:

• Motor Winding Insulation
• Slot Liners
• Interturn Insulation
• Phase Insulation
• Liner Insulation
• Electrical Barriers
• Generator Winding

The correct material must always be chosen with respect to the total insulation system, the temperature, the voltage, and the standards.

For higher temperatures, Harnawa even offers NPN laminated Nomex insulation paper suitable for Class F and Class H applications and comes in various thicknesses.

F Class vs Class H Insulation Paper

F Class and Class H are different thermal insulation classes.

F Class: 155°C

H Class: 180°C

It will depend upon the thermal class needs of the electrical apparatus.

In case where there is a specific requirement of 155 degree centigrade thermal class, F-Class insulation paper may be suitable. In case where there is a requirement of greater thermal class, then Class H material may be considered.

One example of Class H material is the NMN insulation paper by Harnawa that uses Aramid + Polyester film + Aramid combination. The website offers other high temperature insulation materials including Nomex and AHA papers.

It is important to consider more than just the temperature class while selecting the insulation paper. Other things to consider include dielectric strength, thickness, mechanical strength, flexibility and compatibility with varnish / resin.

Technical Specifications of F Class Insulation Paper

The specifications depend on the particular grade and construction. Harnawa’s AMA F Class insulation paper is available in multiple thickness grades.

The available breakdown voltage varies by thickness, with Harnawa listing values from approximately ≥6 kV to ≥28 kV across its AMA grades.

How to Choose the Right F Class Insulation Paper

Choosing the correct insulation material is important because different electrical systems have different requirements.

Consider Operating Temperature

Consider first what temperature level you expect your equipment to operate at. If the insulation system is supposed to work at Class F, it is necessary to select a material with thermal class of 155°C.

Check Required Thickness

Thickness impacts both mechanical and electrical parameters. A thinner material may be considered if the space is limited; otherwise, it is better to use thicker insulation.

Check Dielectric Strength

The dielectric strength should be sufficient to provide proper insulation against voltages and electric stresses applied.

Consider Mechanical Strength

The material should be able to withstand some mechanical stresses such as bending, insertion, winding, vibrations, and others during manufacturing process and during work.

Check Flexibility

In case the application requires flexibility, it should be provided by insulation material. The material should be easily processable without cracking, tearing and loss of its insulating abilities.

Consider Compatibility

The insulation material should be compatible with varnish, resin, adhesive, wire enamel and other components used in the electrical insulation system.

Why Choose Harnawa for F Class Insulation Paper?

Harnawa Insulations supplies a wide variety of electrical insulating materials to manufacturers and industries in India. Some of the products offered by Harnawa include aramid papers, laminated composite insulating paper, insulation pressboard and paper, polyester film, fiberglass insulating products, insulation tapes, polyimide films, and other electrical insulating components.

Harnawa offers its specialty insulation paper, AMA, which is specifically designed for the F Class with the class F temperature rating of 155°C. This product comes in different thicknesses and is recommended for use as slot insulation, inter-turn insulation, liner insulation, motors, generators, and electrical appliances.

Harnawa also has a wide variety of other insulation pressboard and paper products that customers may want to compare with when selecting from other insulation material options for electrical and industrial applications.

Harnawa’s Nomex paper line features Class H electrical insulation materials for motors, transformers, generators, traction motors, and other heavy-duty electrical machinery.

Frequently Asked Questions

1.What is F Class Insulation Paper?

The F Class insulation paper is an electrical insulation paper that is meant for F Class insulation thermal ratings of 155°C. F Class Insulation Papers are usually applied to Motors, Generators, Coils, Transformers, and other electrical appliances.

2.What is the temperature rating of F Class insulation?

The Thermal Class Rating of F Class Insulation is 155°C.

3.What is AMA insulation paper?

AMA Insulation Paper is a paper that comprises of Aramid + Polyester Film + Aramid combination. Harnawa provides AMA Insulation Paper which is a Class F 155°C insulation.

4.Where is F Class insulation paper applicable?

It is applicable for Slot Insulation, Inter-Turn Insulation, Liner Insulation, Motor Winding Insulation, Generators, and Electrical Appliances.

5.Is F Class insulation suitable for motors?

Yes. F Class insulation materials are widely used in electrical motors in case of 155°C thermal class suitability for the insulation system.

6.What is the difference between F Class and H Class insulation?

While the thermal class of F Class is 155°C, the thermal class of H Class is 180°C.

7.Does Harnawa provide other insulation materials?

Yes. The product range of Harnawa includes aramid papers, laminated insulation composites, insulation papers and pressboards, fiberglass products, polyester films, polyimide films, high-temperature insulation tapes, and other electrical insulation products.

Get F Class Insulation Paper from Harnawa Insulations

The F Class Insulation Paper is an essential element used for electrical insulation when good dielectric, mechanical, flexible properties, and F class at 155 degrees Celsius are needed.

Harnawa Insulations offers F Class laminated insulation like AMA insulation paper along with many other types of electrical insulations. Customers have a choice of different constructions and thicknesses in order to select the right insulation for their needs.