Understanding the SB-SGS Silicone-Coated Fiberglass Sleeve Family
Insulating sleeve buyers across new energy vehicles, 5G communications, robotics, drones, home appliances, and industrial equipment routinely face a common set of problems: substandard breakdown voltage, poor tear resistance, rough surface finish after processing, unstable raw material quality, and chaotic thickness claims among suppliers. Against this backdrop, the SB-SGS series fiberglass tube line, manufactured by Shenzhen Sunbow Insulation Materials MFG. Co., Ltd. under the SUNBOW brand, has been built specifically around measurable, verifiable product data rather than marketing claims alone.
SUNBOW positions the SB-SGS family as a domestically produced alternative that matches the specification requirements historically associated with international first-tier insulation brands, while being backed by third-party CNAS test reports and proprietary process formulas. This article reviews the documented specifications across the SB-SGS product range to help technical buyers evaluate fit for their applications.
Core Technical Specifications Across the SB-SGS Series
Breakdown Voltage and Insulation Strength
Breakdown voltage performance varies by model within the SB-SGS series to match different application risk profiles. The SB-SGS-40 Fiberglass Tube (Inner White Outer Black) carries an actual measured breakdown voltage greater than 4 kV, a figure SUNBOW states matches international first-tier product specifications. The SB-SGS-40(EX) Customized Glass Fiber Tube, built to substitute DELFINGEN SG-240, exceeds 7,000 V — providing margin over the SG-240's reported 6,000 V rating while maintaining Class A dielectric performance. At the higher end, the SB-SGS-100 High-Pressure Casing Fiberglass Tube is rated for 10 kV voltage withstand, and the SB-SGS Fiberglass Casing used in drone and robotics applications reaches breakdown voltage up to 10,000 V. Across the broader SB-SGS Series Fiberglass Tube line, SUNBOW reports insulation strength more than 30% above peer products and voltage capability exceeding 10 kV.
For lower-voltage household appliance applications, the SB-SGS-15 and SB-SGS-25 Fiberglass Tubes are specified with withstand breakdown voltage greater than 1.5 kV, paired with high-grade flame-retardant performance suited to wiring harnesses, motors, and transformers.
Temperature Resistance and Material Sourcing
Temperature resistance across the SB-SGS line generally spans from -60°C up to 260°C depending on the specific model, a range SUNBOW attributes to the use of alkali-free, sodium-free glass fiber yarn combined with silicone imported from Germany. The SB-SGS-40 variant is rated up to 260°C, which the company compares to approximately 200°C for domestic peer products. The SB-SGS-100 operates across -60°C to 200°C, while the SB-SGS Fiberglass Casing for drones and robotics is rated for continuous use from -50°C to 200°C.
Surface Finish and Wear Resistance
A proprietary weaving process is credited with producing tight, moderate yarn density and a smooth tube surface, which SUNBOW states lays the foundation for coating quality. Tear and wear resistance on the SB-SGS-40 is reported at more than twice the level of peer products, attributed to the toughness of the German silicone raw material, which the company states exceeds domestic silicone by more than twice. The SB-SGS Fiberglass Casing used in drone applications is described as having almost no surface hardness and generating no friction after use, alongside excellent moisture resistance, shock resistance, corona resistance, leakage resistance, and chemical resistance.
Product Variants Within the SB-SGS Line
SB-SGS-40 and SB-SGS-40(EX)
The standard SB-SGS-40 (Inner White Outer Black) targets spotlight insulation and drive motor protection, with its dual-color configuration offered as a surface finish differentiator uncommon among peer products. The SB-SGS-40(EX) variant is purpose-built as a customized substitute for DELFINGEN SG-240, combining non-dewaxed glass fiber reinforcement with low hardness and soft touch comparable to the reference product, aimed at easing wire-threading friction in automotive and household wiring harness work.
SB-SGS-70, SB-SGS-15, SB-SGS-25, and SB-SGS-30
The SB-SGS-70 Fiberglass Tube is positioned for new energy vehicle drive motors, electronic control systems, and battery packs requiring elevated insulation strength. The SB-SGS-15 and SB-SGS-25 serve household appliance wiring harnesses, motors, and transformers at commercial appliance grade. The SB-SGS-30 Fiberglass Sleeve uses a self-formulated coated silicone oil and is positioned as a direct replacement for DELFINGEN SG-240, achieving 4.0 kV breakdown voltage at a 0.66 mm wall thickness while raising temperature resistance by 40–50°C over miscellaneous market fiberglass sleeves.
SB-SGS-100 and Double-Layer Constructions
The SB-SGS-100 High-Pressure Casing Fiberglass Tube combines an extra-thick silicone rubber oil coating with 10 kV voltage withstand capability, VW-1 flame-retardant grade, and thickness above 1.0 mm, designed for high-efficiency, high-heating equipment and premium automotive drive motors. Related double-layer constructions — including the Double-Layer Fiberglass Tube and the SB-AGSD Double-Layer Acrylic Fiberglass Sleeve — use a twice-repeated weaving and oiling process to achieve wall thickness of 1.2 mm or greater on large tubes, with service life above 10 years supported by a long-term service reliability prediction method recognized by experts of the Chinese Academy of Sciences.
Manufacturing Capability Behind the Specifications
SUNBOW's ability to deliver these specifications at scale is supported by fully automated production infrastructure, including high-speed braiding machines operating at an output level the company states is three times higher than the majority of peer manufacturers, fully automatic yarn-punching machines, and fully automatic pipe-passing machines introduced in 2020. Across two factories in Shenzhen and Dongguan covering approximately 20,000 square meters, monthly output reaches 8.4 million meters. Quality verification runs through an in-house testing laboratory equipped with a VW-1 UL flame-retardant tester, high-voltage tester, high and low temperature tester, and other industry test equipment, supplemented by CNAS third-party certified test reports.
Verified Performance in Real-World Applications
Documented customer cases illustrate how these specifications perform under operating conditions. A Mercedes-Benz drive motor supplier has used SB-SGS-40 fiberglass tubes monthly for new energy drive motor insulation without quality accident complaints across several years; in a 30-day continuous operation test at Mercedes-Benz headquarters, SUNBOW's fiberglass tube was the only one among competing manufacturers that did not crack. A Thailand lighting manufacturer, after unsuccessful trials with multiple other suppliers, passed a 15-day verification of the SB-SGS-40 sample before moving to formal mass production. A Mexican drone engineering customer adopted the SB-SGS Fiberglass Casing in 2016 after a trial, supporting five new drone models that flew successfully that year. In North Macedonia, a contactor and switch manufacturer whose previous fiberglass tube supply broke easily during use confirmed SB-SGS series performance through an on-site wear test, progressing from a trial order of tens of thousands of meters to a follow-up order of 200,000 meters.
Choosing a Silicone-Coated Fiberglass Sleeve Supplier
For buyers evaluating silicone-coated fiberglass sleeve options, the SB-SGS specification range — spanning breakdown voltage from above 1.5 kV to 10,000 V, temperature resistance from -60°C to 260°C, and documented wear and tear resistance exceeding twice that of peer products — offers a reference point for comparing stated performance against actual, tested figures. SUNBOW's emphasis on CNAS third-party verification, proprietary process formulas, and multi-year quality track records across automotive, lighting, drone, and industrial customer applications provides measurable data for buyers seeking to transition from imported dependence toward a stable, specification-matched local supply source.
www.sunbowgd.com
Shenzhen Sunbow Insulation Materials MFG.Co.,Ltd
