Class F NMN Insulation Paper Supplied for Motor Slot Insulation

Project Overview

An Indonesian insulation material distributor contacted Xuchang Chengrui Insulation Material Co.,Ltd. to source Class F NMN insulation paper for local motor repair workshops and small motor manufacturers.

The customer was looking for a flexible insulation paper that could be used for motor slot insulation, phase insulation and rewinding work. Their local customers handled different motor sizes, so the material had to be supplied in roll form and then cut locally according to each motor slot dimension.

After checking the application and processing method, Chengrui recommended 6640 NMN insulation paper as a suitable Class F material for their motor insulation requirements.

Customer Background

The customer is a local distributor in Indonesia supplying insulation materials to motor repair companies, rewinding workshops and electrical maintenance users.

Before contacting Chengrui, they mainly purchased standard polyester-based insulation materials from local suppliers. These materials worked for basic repair jobs, but some workshops started asking for better insulation paper for Class F motor applications.

Their main problem was not just price. They needed one material that could be:

easy to cut, easy to fold, strong enough during coil insertion, suitable for higher working temperature, and stable enough for repeated motor rewinding work.

For this reason, the customer began looking for NMN insulation paper from China.

Why the Customer Needed NMN Insulation Paper

In motor repair work, slot insulation paper is handled manually most of the time.

Workers cut the insulation paper into strips, fold it into shape and insert it into the stator slot before winding. If the paper is too soft, it may deform. If the surface is rough or the material is too brittle, it may be damaged during insertion.

The customer told us that some local workshops had this issue when using cheaper insulation paper. The material could be used, but the processing stability was not always good, especially for motors requiring Class F insulation performance.

NMN was selected because it offers a better balance between flexibility, strength and heat resistance.

The structure of NMN insulation paper is: aramid paper + polyester film + aramid paper

The polyester film gives the material mechanical strength, while the aramid paper layers improve heat resistance and surface insulation performance.

For Class F motor slot insulation, this structure is more suitable than ordinary polyester insulation paper.

Material Supplied

For the first order, Chengrui supplied Class F 6640 NMN insulation paper in roll form.

Sample Checking and Customer Test

Before confirming the regular order, the customer asked for material details and wanted to make sure the NMN paper could be used by their workshop customers.

Chengrui first confirmed the application, thickness and roll width. Then we provided product photos, technical information and packing details for the customer's review.

After receiving the material, the customer arranged a simple workshop test.

The workers cut the NMN paper into slot liner strips, folded the edges and inserted the material into several motor slots. They mainly checked three points:

whether the paper cracked during folding, whether it could be inserted smoothly, and whether the material had enough stiffness to keep its shape inside the slot.

The result was positive. The customer confirmed that the NMN paper was easier to process than expected and suitable for their Class F motor repair applications.

Application in Indonesia

The NMN insulation paper was mainly used by local motor repair and rewinding workshops in Indonesia.

Typical applications included:

• motor slot liners;

• phase-to-phase insulation;

• coil end insulation;

• winding protection;

• Class F motor repair and rewinding.

For the customer, the biggest advantage was flexibility in local processing. One roll could be slit and cut into different sizes according to actual motor repair needs.

This helped their local customers reduce material waste and keep fewer fixed-size insulation parts in stock.

Customer Feedback

After the first shipment, the customer gave positive feedback on the roll quality and processing performance.

They mentioned that the surface was clean, the roll edge was neat, and the material could be cut smoothly for slot liner preparation.

For motor repair workshops, this was important because they needed material that could be used directly without complicated processing.

The customer also planned to recommend the NMN insulation paper to more local motor repair users who were upgrading from ordinary polyester insulation paper to Class F insulation materials.

What This Case Shows

This Indonesia case shows a common situation in the motor insulation market.

Many buyers do not start by asking for a full technical comparison. They simply need a material that works reliably in daily production or repair work.

For motor slot insulation, the right material should not only meet the thermal class. It should also be practical during cutting, folding and insertion.

For many Class F motor applications, NMN insulation paper is a suitable choice because it provides a good balance of insulation performance, mechanical strength and processing convenience.

If the application only requires standard insulation, DMD insulation paper may be enough. If the motor requires higher temperature resistance, NHN insulation paper can also be considered.

Conclusion

Chengrui supplied Class F NMN insulation paper to an Indonesian customer for motor slot insulation and rewinding applications.

The material was supplied in roll form with 0.25mm thickness and 914mm width, allowing the customer to cut and process the insulation paper locally for different motor sizes.

For this customer, NMN insulation paper was not only a higher-grade insulation material. It was a practical solution that helped local workshops improve processing stability in Class F motor repair work.

For NMN insulation paper, motor slot insulation paper or other flexible insulation material requirements, Chengrui can provide customized supply solutions according to your application and processing needs.