4KV Fiberglass Sleeve
  • Air Pro4KV Fiberglass Sleeve
  • Air Pro4KV Fiberglass Sleeve
  • Air Pro4KV Fiberglass Sleeve
  • Air Pro4KV Fiberglass Sleeve
  • Air Pro4KV Fiberglass Sleeve

4KV Fiberglass Sleeve

The 4KV glass fiber sleeve is made of high-purity alkali-free glass fiber yarn woven into the sleeve, and then after high temperature treatment, it is made of silicone resin and silicone rubber.

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Product Description

Introduction to 4KV fiberglass casing:

The 4KV glass fiber sleeve is made of high-purity alkali-free glass fiber yarn woven into the sleeve, and then after high temperature treatment, it is made of silicone resin and silicone rubber.

4KV Fiberglass Sleeve


The synthesis of special high temperature resistant materials determines that high temperature bushings have the characteristics that many other similar materials are difficult to replace. 4KV glass fiber bushings themselves have high electrical insulation, heat resistance, corrosion resistance, aging resistance and heat dissipation. Excellent characteristics, and because of its excellent flexibility and elasticity, it can maintain its flexibility and resistance to tortuosity at a low temperature of minus 50 ℃, without reducing its electrical insulation.


1. Safety and environmental protection, protect the health of workers

The alkali-free glass fiber in the 4KV glass fiber casing has strong tensile strength, will not be wrinkled and broken, is resistant to vulcanization, is smoke-free, halogen-free, non-toxic, pure oxygen, non-combustible, and has good insulation characteristics. After the organic silicone is cured, it will be strengthened. The safety and environmental protection performance effectively protects the human health of workers and reduces the incidence of occupational diseases. Unlike other products, which are extremely harmful to the human body and the environment.

2. Splash-proof, multiple protection

In the smelting industry, the temperature of the medium in the electric furnace is extremely high, and it is easy to form high-temperature splash (the same is true in the electric welding industry). After cooling and solidification, slag is formed on the pipe or cable, which will harden the rubber on the outer layer of the pipe or cable. Ultimately embrittlement and crack. Furthermore, unprotected equipment and cables are damaged. The 4KV fiberglass sleeve coated with multiple silica gels can achieve multiple safety protections. The temperature resistance can be as high as 600 degrees Celsius. It can effectively block the high temperature melting of molten iron, molten copper, and molten aluminum. Splashing of objects to prevent damage to surrounding cables and equipment.

3. Thermal insulation, energy saving and consumption reduction, radiation resistance

In high-temperature workshops, many pipelines, valves or equipment have very high internal temperatures. If they are not covered with protective materials, it is easy to cause burns or heat loss. Especially the 4KV fiberglass casing has better thermal stability than other polymer materials, as well as radiation resistance and thermal insulation, preventing accidents, reducing energy consumption, and preventing the heat of the medium in the pipeline from being directly transferred to the surroundings. The environment makes the temperature of the workshop too high, saving the cost of cooling.

4KV glass fiber casing application range:

Insulation protection of wiring harness, hot runner, steel, smelting, shipbuilding and chemical industry and other high temperature areas, heating area cables, H-class & N-class motors, household appliances, electric heating equipment, special lamps, etc.

4KV glass fiber casing parameters:

Characteristic items

Characteristic parameter

experiment method


Smooth surface, uniform thickness covered with silicone resin coating, weaving patterns are clearly visible


Continuous use temperature (℃)


UL standard test

Temperature resistance

200±2℃ 24h≥1/2 original voltage value

UL standard test

Heat aging

200℃, 12 hours, no cracks

The test temperature is 200℃, 24 hours. Take it out and put it at room temperature for testing. The average damage is not less than half of the failure voltage before aging, and there is no crack on the surface.

Cold bending

Test temperature -10℃, no cracks in 1 hour

Test temperature -10℃, 1 hour, rewind the test tube on the casing of this specification and rewind 6 times, the casing surface coating has no cracks or peeling phenomenon

Horizontal combustion


Burn with a flame of 1000±50Btu/ft, and put the horizontally placed casing in contact with the outer flame of the flame and burn for 15 seconds at a time, 2 times in a row, any one of the 2 tests spreads the flame cannot exceed 30 seconds and automatically extinguishes



UL1441 test

Volume resistivity (Ω.CM)

1014 Ωcm or more

UL1441 test

Hydrolytic stability

No sticky, no deformation, no softening

After putting the casing in the water for 24 hours, the surface of the casing will not be sticky, deformed, or soft


For each of our products, we will design a dedicated test equipment, and each product is an empirical test, not a random test

Product quality certification:

Our company adheres to the concept of continuous innovation and advancement with the times, combined with the development of the 5G era, and the development and manufacturing of supporting smart equipment related products. A core R&D team with more than 20 years of experience has established a quality inspection room and an engineering research and development room. The related quality detectors ensure the quality of the products, so that our company has a number of invention patents, interprets the craftsmanship spirit with our own actions, and has successively passed ISO9001 certification, TS16949, UL, SGS, and other certifications. The company insists on product research and development to drive market sales and market sales to drive enterprise development. Adhering to the four-in-one business philosophy of "integrity, quality, efficiency, and innovation", we will continue to serve domestic and foreign customers with high-quality products, reasonable prices, perfect after-sales services, and the principle of mutual benefit.

Service Introduction:

Pre-sales: Pre-sales will actively communicate with customers detailed information, customer needs, product parameters, quality standards, provide consultation, accept telephone orders and mail orders, provide a variety of convenience and financial services, etc.

In-sale: In-sale provides customers with solutions with the best performance-to-price ratio, proactively track contract signing, delivery of goods, and help customers solve problems.


1. Dissatisfaction caused by the quality of the product itself. We will help the customer to solve the problem as soon as possible within the agreed period.

2. If the product cannot be used normally due to man-made reasons. We explain the cause of the problem to the customer, indicating that this type of problem is beyond our responsibility, and then provide other solutions to the customer based on the customer's problem.


Q: Is it high temperature resistant? Will cracks occur after high temperature resistance?

A: The 4KV glass fiber sleeve is woven with extremely high temperature resistant glass fiber, and the surface silica gel is added with special materials such as appropriate flame retardants to make it have excellent temperature resistance, long-term continuous use temperature range, -10℃~200℃, with or without cracks and cracks.

Q: Your bending and twists will reduce the electrical insulation?

A: Our conventional 7KV glass fiber casing body has high electrical insulation, and has good heat resistance, corrosion resistance and heat dissipation. Because of its excellent flexibility and elasticity, it is at minus 60°C. The low temperature can also maintain its flexibility, and its film is strong and resistant to tortuous, although it is twisted, it will not detract from its electrical insulation.

Q: Are your products flame retardant?

A: Our 4KV fiberglass sleeving products are flame-retardant and meet the American UL testing standards.

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