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Transformer Insulation Materials Custom
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No. of Product Width (mm) Model of Raw Yam (tex)   Model of Raw Yam (tex)  Mesh (mm)  Mesh (mm)  Mesh (mesh/inch)  Mesh (mesh/inch)  Weave Resin Content (%) Weight (g/m 2) Fracture Strength (N/50mm)  Fracture Strength (N/50mm) 
Warp Woof Warp Woof Warp Woof Warp Woof
1 1000-1250 32x2 204 5 5 5 ± 0.5 5 ± 0.5 union 20 ± 2 65 ± 3 500 500
2 1000-1250 50x2 255 5 5 5 ± 0.5 5 ± 0.5 union 18 ± 2 80 ± 3 800 900
3 1000-1250 100x2 306 5 5 5 ± 0.5 5 ± 0.5 union 18 ± 2 125 ± 3 1100 1300
4 1000-1250 134x2 357 5 5 5 ± 0.5 5 ± 0.5 union 18 ± 2 145 ± 3 1300 1500
5 1000-1250 134x2 408 5 5 5 ± 0.5 5 ± 0.5 union 18 ± 2 2160 ± 3 1500 1700
6 1000-1250 50x2 204 4 5 6 ± 0.5 5 ± 0.5 union 18 ± 2 80 ± 3 550 800
7 1000-1250 100x2 255 4 5 6 ± 0.5 5 ± 0.5 union 18 ± 2 110 ± 3 1100 1000
8 1000-1250 134x2 306 4 5 6 ± 0.5 5 ± 0.5 union 18 ± 2 150 ± 3 1400 1500
9 1000-1250 32x2 204 4 4 6 ± 0.5 6 ± 0.5 union 19 ± 2 80 ± 3 550 850
10 1000-1250 100x2 204 4 4 6 ± 0.5 6 ± 0.5 union 18 ± 2 120 ± 3 1100 900
11 1000-1250 134x2 255 4 4 6 ± 0.5 6 ± 0.5 union 18 ± 2 150 ± 3 1500 1600
12 1000-1250 134x2 306 4 4 6 ± 0.5 6 ± 0.5 union 18 ± 2 160 ± 3 1500 1800
13 1000-1250 50x2 306 5 6 5 ± 0.5 4 ± 0.5 union 18 ± 2 80 ± 3 500 1000
14 1000-1250 100x2 357 5 6 5 ± 0.5 4 ± 0.5 union 18 ± 2 110 ± 3 1000 1200
15 1000-1250 255x2 408 10 10 2.5 2.5 union 18 ± 2 220 ± 3 1000 1200
16 1000-1250 255x2 561 10 10 2.5 2.5 union 18 ± 2 125 ± 3 1000 1400
17 1000-1250 375x2 561 10 10 2.5 2.5 union 18 ± 2 145 ± 3 1400 1500
18 1000-1250 375x2 561 10 10 2.5 2.5 union 18 ± 2 160 ± 3 1500 1600
19 1000-1250 33x2 67 2.8 2.8 9 ± 0.5 9 ± 0.5 union 21 ± 2 45 ± 3 600 600
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Transformer Insulation Materials Manufacturers

About
Zhejiang Yuanda Fiberglass Mesh Co.,ltd.
Zhejiang Yuanda Fiberglass Mesh Co.,ltd.
Zhejiang Yuanda Fiberglass Mesh Co., Ltd. is China Transformer Insulation Materials Manufacturers and Custom Transformer Insulation Materials Factory, was founded in 2000. It is a technology-oriented manufacturing enterprise focusing on the new materials field, specializing in the research and development, and production of composite reinforcing materials, insulating materials, and related intelligent equipment. Committed to providing professional and reliable products and services to customers worldwide. The company is located in the Yangtze River Delta Economic Circle of China, close to Ningbo Port and Shanghai Port. The unique geographical location has brought convenience to the company's import and export business. The company covers an area of nearly 33,000 square meters and has modern standard workshops.
The three core business segments
1. Composite material fiber bars and fiber bar mesh sheets (GFRP), as well as supporting production equipment.
2. Special interlayer insulating materials for power transformers and motors.
3. For the past 25 years, Zhejiang Yuanda Fiberglass Mesh Co., Ltd. has been deeply engaged in the field of new materials, deepening technological innovation and industrial collaboration, continuously expanding the application scope of its products, and has won wide recognition from customers. In the future, we will be committed to building a leading domestic supplier of composite new materials and injecting continuous impetus into the high-quality development of the industry.
Certificate Of Honor
  • Test Report
  • Test Report
  • Quality Management System Certificate
  • Quality Management System Certification Certificate
  • Safety Production Standardization
  • Business License
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Product Category Industry knowledge

1. What Are Transformer Insulation Materials?

Transformer insulation materials are essential components used to electrically isolate conductive parts and protect transformers from thermal, electrical, and mechanical stress. These materials help maintain operational safety, improve energy efficiency, and extend transformer lifespan. Common insulation materials include insulating paper, fiberglass mesh, epoxy resin, insulating varnish, and polymer composites.

In modern power systems, transformers often operate under temperatures exceeding 105°C to 220°C. High-quality insulation materials reduce dielectric losses and improve thermal endurance. According to industry data, reliable insulation systems can increase transformer service life by 30% or more.

2. Main Types of Transformer Insulation Materials

（1）Cellulose Insulation Paper

Cellulose paper is widely used in oil-immersed transformers because of its excellent dielectric properties and affordability. It is commonly applied around transformer windings and conductors.

（2）Fiberglass Mesh Materials

Fiberglass mesh reinforced materials provide outstanding mechanical strength and heat resistance. These materials are commonly used in dry-type transformers and high-voltage insulation systems where dimensional stability is critical.

（3）Epoxy Resin Systems

Epoxy resin insulation is known for its superior moisture resistance and strong adhesion. It is often used in cast resin transformers operating in humid or polluted environments.

Comparison of Common Transformer Insulation Materials
Material Temperature Resistance Main Advantage
Cellulose Paper 105°C Low Cost
Fiberglass Mesh 180°C+ High Strength
Epoxy Resin 155°C Moisture Resistance

3. Why High-Quality Insulation Materials Matter

Transformer failures are often linked to insulation breakdown. Studies show that approximately 60% of transformer failures are related to insulation aging and overheating. Using advanced insulation materials significantly improves transformer reliability and reduces maintenance costs.

  • Improved dielectric performance
  • Better thermal stability under heavy loads
  • Enhanced mechanical strength and durability
  • Reduced maintenance frequency and downtime

4. Zhejiang Yuanda Fiberglass Mesh Co.,ltd.

Zhejiang Yuanda Fiberglass Mesh Co.,ltd. is a professional manufacturer specializing in high-performance fiberglass mesh materials widely used in transformer insulation systems, construction reinforcement, and industrial applications.

The company operates a 33,000 m² facility equipped with in-house weaving and impregnation-curing production lines. With an annual production capacity of 20 million m² of high-strength GFRP mesh, Zhejiang Yuanda ensures stable supply and consistent product quality.

The manufacturing process follows a green, energy-efficient, and intelligent production concept. Critical factors such as tension control, coating pickup, and curing profiles are continuously monitored to guarantee consistent aperture, weight, and adhesion in every batch.

The company has passed ISO9001-2015 international quality system certification and obtained CE certification from the European Union. Its trademark, "Yimabao", has earned strong recognition from customers worldwide thanks to strict quality standards and reliable product performance.

5. Future Trends in Transformer Insulation Materials

As the global energy industry moves toward higher efficiency and smart grid systems, transformer insulation materials are evolving rapidly. Manufacturers are increasingly adopting eco-friendly composite materials and nano-enhanced insulation technologies.

Industry analysts predict that the global transformer insulation market could grow by over 6% annually through the next decade, driven by renewable energy expansion and electric grid modernization.

6. FAQs About Transformer Insulation Materials

Q1. What is the most commonly used transformer insulation material?

Cellulose insulation paper remains one of the most widely used materials because of its affordability and reliable dielectric performance.

Q2. Why is fiberglass mesh important in transformer insulation?

Fiberglass mesh provides excellent heat resistance, mechanical reinforcement, and dimensional stability, making it suitable for high-temperature transformer applications.

Q3. How long can transformer insulation materials last?

Under proper operating conditions, high-quality transformer insulation systems can last 20 to 40 years, depending on temperature, load, and environmental conditions.