Meeting the Demand for Reliable Flame Retardant Fiberglass Sleeving in China

As electronics, motors, transformers, new energy vehicles, photovoltaic energy storage, aerospace, shipbuilding, robotics, and 5G/6G communication systems continue to expand across global supply chains, the demand for insulation materials that withstand high temperature, high voltage, and flame exposure has intensified. Industries operating in the "three-electric" systems of new energy vehicles and the photovoltaic energy storage field, in particular, require highly reliable protective sleeves to resolve wire harness protection and electrical insulation stability challenges. Against this backdrop, Shenzhen Sunbow Insulation Materials Manufacturing Co., Ltd., operating under the SUNBOW brand, has built its business around research, production, and sales of insulation sleeves, positioning itself as a supporting supplier for the insulation sleeve industry.

A Manufacturing Base Built for Scale and Consistency

Founded in October 2003, Sunbow operates from its headquarters at Sunbow Industrial Park, No.8, 2nd Industrial Zone, Xiacun Community, Gongming Sub-district Office, Guangming District, Shenzhen, with a second production base located in Qiaotou, Dongguan. This dual-site structure supports a monthly output of various sleeves exceeding 40 million meters, backed by a team of around 150 employees led by the General Manager and supported by an R&D team along with a production management and quality control system. In 2025, the company recorded annual sales of USD 24.31 million, with business coverage distributed globally across Europe, North and South America, Japan, South Korea, Australia, New Zealand, Southeast Asia, South Asia, Russia, and Africa. This combination of production capacity and geographic reach reflects a manufacturing operation structured to serve both regional and international demand for flame retardant fiberglass sleeving.

Engineering Insulation Performance Across Temperature Extremes

At the core of Sunbow's fiberglass sleeve series is the Silicone Resin Fiberglass Sleeve (SB-SGS, SB-SGSD), rated for an operating temperature of -60°C to 200°C with an H-class insulation grade and breakdown voltage options ranging from 1.2kV to 10kV. This product line addresses electrical breakdown or material aging risks that motor and wiring harnesses face under high-temperature conditions, and the company notes it is one of few mainland manufacturers offering full-color safety certifications to meet color coding requirements.

For applications requiring even greater thermal tolerance, the High-Viscosity Silicone Fiberglass Sleeve (SB-SGS-E) extends the operating range to -60°C through 240°C, maintaining an H-class insulation grade with breakdown voltage options between 4kV and 10kV, and is used in coils, windings, and other industrial sectors. The Expandable Silicone Resin Fiberglass Sleeve (SB-SGS-EX) operates between -60°C and 250°C with breakdown voltage from 4.0kV to 7.0kV and an expansion ratio of 1:1.5 or 1:2, suited to internal wiring for electronics, appliances, automobiles, and H/C class motors.

At the upper end of the thermal spectrum, the High-Temperature Fireproof Sleeve (SB-SGS-FH) is rated for continuous operation between -60°C and 260°C, with short-term heat resistance documented at 800°C for 30 minutes, 1100°C for 15 minutes, 1500°C for 1 minute, and 1650°C for 30 seconds—performance data relevant to environments such as steel plants, smelters, glass factories, rail transit, and large transformer stations. Beyond this, the High-Silica Fiber Sleeve (SB-TGS-1000), woven from silica fiber with SiO₂ content over 96%, sustains continuous operation up to 1000°C with a peak temperature of 1650°C, while the Quartz Fiber Sleeve (SB-TGS-1050), woven with SiO₂ content of 99.9% or higher, is rated for continuous use up to 1050°C with a peak of 1700°C, serving aerospace, military, semiconductor, and petrochemical applications.

For mid-range thermal and mechanical protection, the Polyacrylate Fiberglass Sleeve (SB-AGS, SB-AGSD) provides F-class insulation between -40°C and 155°C with oil and chemical resistance through its polyacrylate coating, while the Polyurethane Fiberglass Sleeve (SB-PUGS) offers mechanical toughness for bent or compressed wiring harnesses within -15°C to 155°C. The PPS Fiber Sleeve (SB-PPS) covers -30°C to 190°C with H-class insulation and is applied across electronics, electrical machinery, automobiles, aerospace, and communication equipment.

Certification and Compliance as a Production Standard

Sunbow's fiberglass sleeving production line operates under an IATF 16949:2016 Automotive Quality Management System Certification, alongside ISO 9001:2015 Quality Management System Certification and ISO 14001:2015 Environmental Management System Certification. Braided products carry CUL safety certifications E333178 (UZIQ2, VW-1) and E333177 (UZFT2/8, 200V, 600V), while extruded products hold CUL certification YDPU2/8: E360625. All products referenced comply with EU RoHS, REACH, PFOA, and PFOS test standards. These certifications provide a documented basis for procurement teams evaluating flame retardant fiberglass sleeving for regulated industries, particularly automotive supply chains governed by IATF 16949.

Recognition Supporting Continued Development

Sunbow holds status as a National High-tech Enterprise and a Shenzhen Specialized, Refined, Unique & Innovative SME, and has been recognized as a Science & Technology Enterprise of Guangming New District, Shenzhen. The company has accumulated over 60 patents, reflecting sustained investment in materials engineering for insulation sleeve products.

Serving Industries Where Insulation Failure Carries Real Consequences

The range of sectors referenced in Sunbow's strategic positioning—electronics, electrical appliances, motors, sensors, transformers, low-altitude economy, aerospace, shipbuilding, AI computing power, robotics, electric heating equipment, special lighting fixtures, electronic instruments, high and low voltage electronic wire harnesses, 5G/6G communications, power adapters, high and low voltage power distribution complete sets of equipment, petrochemical, coal, power systems, charging piles, charging guns, battery flexible connections, fortifications, ultra-high voltage transmission, photovoltaics, energy storage, and new energy vehicles—illustrates the breadth of applications where flame retardant, high-temperature, and high-voltage insulation performance is required. Under IATF 16949 certified supply, the company's automotive industry customer base includes Tesla, BYD, Toyota, Mercedes-Benz, Volkswagen, Geely, and NIO. In the electrical and industrial sector, referenced end customers include ABB, Huawei, Siemens, CRRC, and Schneider Electric, while home appliance industry customers include Haier, Midea, Philips, Panasonic, and Samsung.

A Production Line Oriented Toward Long-Term Supply Reliability

Taken together, Sunbow's dual manufacturing bases in Shenzhen and Dongguan, its monthly output exceeding 40 million meters, its documented certification portfolio, and its fiberglass sleeve range spanning -60°C to 1050°C operating temperatures reflect a production line structured around the specific technical demands of flame retardant fiberglass sleeving. The company describes its strategic positioning as focusing on research, production, and sales of insulation sleeves, with the stated aim of becoming a globally recognized outstanding supporting supplier in the insulation sleeve industry, providing environmentally friendly, safe, and reliable products. For organizations evaluating flame retardant fiberglass sleeving sourced from Chinese production facilities, the combination of temperature-rated product engineering, third-party certification, and multi-industry customer references provides a documented basis for supplier assessment.

https://www.sunbowgd.com
Shenzhen Sunbow Insulation Materials MFG. CO., Ltd