Good Flexibility 4000v Fiberglass Sleeving Factory Silicone Coated Fiberglass Sleeve

Product Overview

UL high voltage Silicone rubber fiberglass sleeve

Made of alkali-free glass fiber woven into a tube, coated with silicone rubber on the outer layer of the tube, and then cured. It has high dielectric strength, good flexibility, heat aging resistance, oil resistance, flame Retardancy, and temperature resistance up to 200 degree. Widely used in circuit insulation protection for new energy vehicles, special vehicles, rail transit, etc

Features:

1. Operating temperature:-40°C~200°C

2. Environmental standard: RoHS, REACH

3. Color: Nature, White, Black, Red, Yellow, Blue, Green, Orange, other colors are available

4. Flame retardant rating: HB

5. Rated voltage: 1.5KV, 2.5KV, 4.0KV, 7.0KV

Support customization, ODM & OEM available

Click to contact us for free samples

VR

PRODUCT SPECIFICATIONS

Items	Technical Parameters	Reference Standard
Appearance	No glue leakage, cracking, etc	GB/T 7113.1-2014
Coating hydrolysis	No coating displacement, adhesion, etc	GB/T 7113.2
Cold bending test	-40℃，4h，No cracks, coating peeling and delamination	IEC60684
Temperature	-40℃～200℃	UL1441
Flame retardant rating	HB	UL94
Breakdown voltage	Reference standard	GB/T 1408-2016
Heat Resistance	250℃±5, 24h, No droplets, no flow marks, no cracking	JB/T 7093 2015

Dimensions

ID - mm			Wall thickness - mm				Wall Thickness（mm）			Package
Size	Tolerance	1500V	2500V	4000V	7000V	M/Roll
Φ2.0	-0.10～0.25	0.35±0.1	0.40±0.1	0.45±0.1	0.5±0.1	100
Φ3.0	-0.10～0.25	0.35±0.1	0.40±0.1	0.45±0.1	0.5±0.1	100
Φ4.0	-0.10～0.35	0.4±0.1	0.45±0.1	0.50±0.1	0.55±0.1	100
Φ5.0	-0.10～0.35	0.4±0.1	0.45±0.1	0.50±0.1	0.55±0.1	100
Φ6.0	-0.10～0.40	0.45±0.1	0.50±0.1	0.55±0.1	0.60±0.1	100
Φ7.0	-0.10～0.50	0.45±0.1	0.50±0.1	0.55±0.1	0.60±0.1	100
Φ8.0	-0.10～0.50	0.45±0.1	0.50±0.1	0.55±0.1	0.65±0.1	50
Φ9.0	-0.10～0.50	0.45±0.1	0.50±0.1	0.55±0.1	0.65±0.1	50
Φ10.0	-0.20～0.70	0.50±0.15	0.55±0.15	0.65±0.15	0.7±0.15	50
Φ12.0	-0.20～0.70	0.50±0.15	0.55±0.15	0.65±0.15	0.7±0.15	50
Φ13.0	-0.30～0.80	0.55±0.15	0.60±0.15	0.70±0.15	0.75±0.15	50
Φ14.0	-0.30～0.80	0.55±0.15	0.60±0.15	0.70±0.15	0.75±0.15	50
Φ15.0	-0.30～0.80	0.55±0.15	0.60±0.15	0.70±0.15	0.75±0.15	50

We don't list all sizes here, other sizes are available on request

Company Show

Suzhou Volsun Electronics Technology Co., Ltd. was founded in 2006. We keep focusing on the R&D, production and sales in insulation, sealing & protection solutions for over 20 years. Quality is our culture. Volsun has a modern quality management system, which has passed a series of quality system certification such as IATF16949, ISO9001 etc. Up to now, Volsun cooperated with customers from 88 countries, we offer suitable sealing, waterproof solutions for some well-know enterprises in communication, Automobile, Power industry etc

Certifications

Trade terms	FOB, EXW, CIF, DDU, DDP, CFR
Payment terms	T/T, L/C, Negotiable
MOQ	100M
Supply capability	1,000,000 mts per month
Lead time	Usually 2-3 working days
Shipment	Express, Air, Sea
Port	Shanghai, Ningbo, Shenzhen
Sample availability	Yes
Sample time	Usually 1-2 days
Packaging	Normal: Plastic bag & Carton & Pallet Special: Customized packing

Abroad Exhibition

Las Vagas AAPEX

Moscow Expo

Hannover Messe

Packaging and Shipping

FAQ

Q 1. How long is the payment term
A: We accept T/T 50% deposit and 50% balance against B/L or L/C copy at sight, also accept Western Union, VISA and Paypal

Q 2. What is the normal lead time for product orders
A: The average lead time for prototype/first piece is 7~10 days, if tooling is involved, the lead time for production tooling is 10 days, and the average production time after sample approval is 2-3 weeks

Q 3. What is your standard packaging

A: All goods will be packed in cartons and loaded on pallets. Special packing methods are acceptable when needed

Q 4. Can you tell us the monthly production capacity of your products
A: It depends on the model, we produce more than 1500 tons of rubber materials per month

Q 5. What kind of certificates do you have
A1: We have ISO9001:2015, IATF16949:2016, ISO14001:2015, ISO45001:2018 certified
A2: We have various rubber compounds approved by UL, ROHS and REACH

Q6: How to check the quality of bulk order
A1: We provide pre-production samples to all customers before mass production if needed
A3: We accept third-party inspection, such as SGS, TUV, INTERTEK, BV, etc

Q 7: Can you provide customized service
A: Yes, we accept customization and can produce products in different sizes, packaging, colors according to requirements

Volsun presents the Good Flexibility 4000v Fiberglass Sleeving Factory Silicone Coated Fiberglass Sleeve — a purpose-built insulating solution engineered to meet demanding high-voltage and thermal protection requirements. Combining advanced materials science with manufacturing precision, this 4000V fiberglass Sleeving and silicone coated fiberglass sleeve is optimized for high-voltage insulation trends and automotive electrical protection applications. Drawing on Volsun’s two production bases, extensive R&D, and decades of experience in polymer materials, this product delivers reliable electrical insulation, flame resistance, and mechanical flexibility for modern electrical systems.

Product Overview and Core Features

The Good Flexibility 4000v fiberglass Sleeving is designed as a high-performance insulation sleeve that resists arcing, withstands thermal stress, and preserves dielectric integrity under challenging conditions. As a silicone coated fiberglass sleeve, it integrates a glass-fiber substrate with a conformal silicone coating to provide enhanced abrasion resistance, moisture protection, and improved dielectric strength. Key features include:

- Rated dielectric performance up to 4000V for robust insulation in demanding high-voltage circuits.

- Silicone coated fiberglass sleeve construction for superior surface hydrophobicity and environmental protection.

- Excellent flexibility to accommodate tight bends, wire harness routing, and dynamic motion without cracking or delamination.

- High temperature stability, enabling continuous operation across wide thermal ranges commonly encountered in electronics and automotive systems.

- Flame-retardant fiberglass substrate that supports fire safety requirements and reduces combustion risk.

- Strong mechanical resilience to abrasion, compression, and vibration for long service life in harsh operating environments.

Materials and Manufacturing Advantages

Volsun’s Good Flexibility 4000v fiberglass sleeving combines a high-quality woven or braided fiberglass carrier with an engineered silicone coating to yield a silicone coated fiberglass sleeve that balances electrical performance with mechanical adaptability. The fiberglass substrate provides intrinsic dielectric strength and flame resistance, while the silicone coating enhances surface tracking resistance and creates a moisture-resistant barrier. Proprietary coating control and curing processes produce a consistent silicone layer that bonds tightly to the fiberglass, minimizing particulate shedding and maximizing adhesion under thermal cycling. This approach supports industry needs for durable insulating Sleeving while adhering to tight quality standards.

Electrical and Thermal Performance

The 4000V fiberglass Sleeving specification addresses contemporary high-voltage insulation trends, where compact, lightweight components are required to safely manage elevated voltages and higher power densities. The silicone coated fiberglass sleeve exhibits stable dielectric properties across a broad temperature range and maintains insulation integrity even after prolonged thermal exposure. For high-voltage Busbars, coil leads, and power conversion modules, the 4000V fiberglass Sleeving provides the necessary barrier to prevent arcing and short circuits. The silicone coating further reduces surface leakage and improves tracking resistance, aligning performance with evolving high-voltage insulation trends and safety expectations.

Applications: Automotive, Electronics, and Industrial Systems

Volsun’s Good Flexibility 4000v fiberglass Sleeving and silicone coated fiberglass sleeve are tailored for a range of applications that demand high-voltage insulation and rugged protection:

- Automotive electrical protection: Modern vehicles incorporate high-voltage architectures for hybrid and electric powertrains, and the 4000V fiberglass Sleeving addresses insulation needs for battery cables, inverter connections, motor leads, and harness protection. The silicone coated fiberglass sleeve supports automotive electrical protection by resisting oil, coolant, and under-hood contaminants while tolerating temperature cycling and vibration.

- Power electronics and inverters: The silicone coated fiberglass sleeve is ideal for insulating high-voltage interconnects, Busbars, and transformer leads in power conversion units where thermal stress and electrical isolation are critical.

- Industrial high-voltage equipment: For switchgear, distribution systems, and testing equipment, 4000V fiberglass Sleeving provides a compact, reliable way to insulate conductors and protect personnel and equipment from high-voltage exposure.

- Telecom and energy systems: In cable assemblies and high-voltage distribution panels, the silicone coated fiberglass sleeve adds a protective layer that reduces the risk of insulation failure due to environmental contamination or mechanical wear.

- Specialty electronic assemblies: Where space constraints and elevated voltages coincide, the 4000V fiberglass Sleeving offers a thin, flexible insulation layer that supports high packing density while maintaining electrical clearance and insulation safety.

Design Flexibility and Installation Benefits

Flexibility is a defining trait of the Good Flexibility 4000v fiberglass Sleeving. The product’s pliable nature makes it easier to route through complex harness geometries and around tight radii without compromising the silicone coated fiberglass sleeve’s protective properties. This ease of installation translates to reduced assembly time and lower labor costs, particularly in high-volume automotive and electronics manufacturing. The sleeve’s compatibility with standard termination techniques—heat shrink collars, clamps, and adhesive-lined collars—further facilitates integration into existing production processes.

Safety, Standards, and Reliability

Backed by Volsun’s history as a National High-tech Enterprise and supported by certifications including IATF 16949 and ISO 9001, the Good Flexibility 4000v fiberglass Sleeving is manufactured under stringent quality systems. The silicone coated fiberglass sleeve meets established materials and flammability standards commonly required by automotive and industrial customers. Volsun’s extensive patent portfolio and controlled production environment ensure consistent product characteristics, traceability, and compliance with customer specifications. These quality assurances are critical as high-voltage insulation trends move toward higher operational stresses and stricter safety regulations.

Competitive Differentiators and Innovation

Volsun leverages a combination of materials expertise and process innovation to differentiate the Good Flexibility 4000v fiberglass Sleeving in the market. The silicone coated fiberglass sleeve benefits from optimized coating formulations that balance adhesion, elasticity, and thermal stability. Production controls minimize voids and coating irregularities, providing a uniform protective layer across the sleeve surface. Through continuous R&D and customer-driven development, Volsun refines the silicone coated fiberglass sleeve design to meet evolving automotive electrical protection needs and other high-voltage insulation trends.

Customization and OEM/ODM Support

Recognizing diverse application requirements, Volsun offers customization options for the 4000V fiberglass Sleeving including varying inner diameters, wall thicknesses, silicone coating weights, and cut-to-length or continuous roll configurations. As an established supplier to thousands of customers globally, Volsun supports OEM/ODM partnerships that include tailored material selection, testing protocols, and packaging solutions. This flexibility enables rapid integration into specialized electrical systems and rigorous qualification processes demanded by automotive and industrial manufacturers.

Performance Testing and Qualification

To ensure reliability in the field, the silicone coated fiberglass sleeve undergoes comprehensive testing for dielectric strength, thermal aging, flammability, moisture resistance, and mechanical durability. Electrical tests validate the 4000V fiberglass sleeving’s ability to withstand rated voltages and limit leakage under specified conditions. Thermal cycling and aging evaluations confirm long-term performance under automotive electrical protection scenarios and continuous high-voltage operation. These qualification efforts align the product with customer expectations for safety and lifecycle performance.

The Good Flexibility 4000v fiberglass Sleeving silicone coated fiberglass sleeve from Volsun is a purpose-engineered solution for modern high-voltage insulation demands and automotive electrical protection challenges. Combining a robust fiberglass carrier with an advanced silicone coating, this 4000V fiberglass Sleeving delivers dielectric reliability, environmental resistance, and installation-friendly flexibility. Backed by Volsun’s manufacturing expertise, certifications, and OEM/ODM capabilities, the silicone coated fiberglass sleeve offers a scalable, high-performance option for designers and engineers facing stringent high-voltage insulation trends and demanding application environments.