China Silicone Coated Fiberglass Sleeving Factory 2026 Guide

 A Manufacturer's Profile Behind Silicone Coated Fiberglass Sleeving

For procurement teams sourcing silicone coated fiberglass sleeving in China, one of the manufacturers worth examining closely is Shenzhen Sunbow Insulation Materials Manufacturing Co., Ltd., operating under the brand SUNBOW. Founded in October 2003, the company is headquartered 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. Its business coverage is globally distributed, with products mainly sold to Europe, North & South America, Japan, South Korea, Australia, New Zealand, Southeast Asia, South Asia, Russia, Africa and other regions.

Strategic Focus and Industry Context

Sunbow's strategic positioning centers on the R&D, production and sales of insulation sleeves, with a stated commitment to becoming a globally recognized supporting supplier in the insulation sleeve industry, providing environmentally friendly, safe and reliable products for the society. This focus responds directly to industry pain points identified across 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, and high and low voltage power distribution complete sets of equipment, along with petrochemical, coal, power systems, charging piles, charging guns, battery flexible connections, fortifications, ultra-high voltage transmission, photovoltaics, energy storage, and new energy vehicle industries. As the knowledge base notes, the "three-electric" systems of new energy vehicles and the photovoltaic energy storage field urgently need highly reliable protective sleeves to solve wire harness protection and electrical insulation stability challenges — a demand that silicone-coated fiberglass sleeving is specifically engineered to address.

Core Silicone Coated Fiberglass Sleeving Products

Sunbow's fiberglass sleeve series includes several silicone-based product lines, each targeting distinct temperature and voltage requirements.

Silicone Resin Fiberglass Sleeves (SB-SGS, SB-SGSD)

This line provides high-temperature insulation and flame retardant protection, with an operating temperature range of -60~200℃. It addresses the risk of electrical breakdown or material aging that wiring harnesses and motors face under high-temperature conditions. The product carries an H-class insulation grade, with breakdown voltage options from 1.2kV to 10kV. Notably, the knowledge base identifies Sunbow as one of few mainland manufacturers with full-color safety certifications to meet color coding requirements — a differentiator for buyers needing certified color-identified sleeving. Core functions include electrical insulation and stable breakdown voltage protection to prevent short circuits under high voltage.

 

 

High-Viscosity Silicone Fiberglass Sleeves (SB-SGS-E)

Designed for coils, windings and other industrial sectors, this variant extends temperature resistance up to -60~240℃, retaining the H-class insulation grade. It is offered in natural, reddish-brown, black standard colors (customizable), with breakdown voltage options of 4kV~10kV. Its core functions combine electrical insulation, softness, radial expandability, flame retardancy, wide temperature resistance, anti-extrusion, corrosion resistance, and halogen-free composition.

Expandable Silicone Resin Fiberglass Sleeves (SB-SGS-EX)

This expandable jacket handles an operating temperature of -60~250℃, with a breakdown voltage of 4.0kV~7.0kV and an expansion ratio of 1:1.5 or 1:2. It suits internal wiring of electronics, appliances, automobiles, H/C class motors, alternators, generators, transformers, and general electrical wiring construction. The knowledge base highlights good compatibility with varnish impregnation, self-extinguishing flame retardancy, high flexibility, and excellent chemical performance.

High-Temperature Fireproof Sleeves (SB-SGS-FH)

For harsh environments such as steel plants, smelters, glass factories, rail transit, and large transformer stations, this jacket withstands an operating temperature of -60~260℃, with documented short-term heat resistance of 800℃ for 30 minutes, 1100℃ for 15 minutes, 1500℃ for 1 minute, and 1650℃ for 30 seconds. It is described as flame retardant, heat resistant, insulating, anti-aging, anti-molten metal splash, waterproof, oil-proof, and acid & alkali resistant.

Complementary Silicone Tubing and Braided Sleeves

Beyond fiberglass sleeving, Sunbow also produces Silicone Tubes (SBS-SRT) rated for food-grade and general industrial use up to 200℃, Silicone Heat Shrink Tubing (SBS-SR-HST) operating at -50~200℃ with a 1.7:1 / 2:1 shrink ratio, and Reinforced Silicone Braided Sleeves (SBS-SRRT), a high-pressure reinforced sleeve designed to maintain stable tube shape under high-temperature and high-pressure special application scenarios.

Certifications and Quality Systems

Quality assurance is documented through multiple systems: IATF 16949:2016 Automotive Quality Management System Certification, ISO 9001:2015 Quality Management System Certification, and ISO 14001:2015 Environmental Management System Certification. For braided products, the company holds CUL Safety Certifications: E333178 (UZIQ2, VW-1) and E333177 (UZFT2/8, 200V, 600V). Extruded products carry the CUL Safety Certification YDPU2/8: E360625. Products are also stated to be compliant with EU RoHS, REACH, PFOA, PFOS test standards. On the honors side, Sunbow has been recognized as a National High-tech Enterprise, a Shenzhen Specialized, Refined, Unique & Innovative SME, and a Science & Technology Enterprise of Guangming New District, Shenzhen, alongside holding over 60 patents.

Manufacturing Scale and Market Performance

According to the knowledge base, Sunbow employs around 150 employees, led by a General Manager and supported by an R&D team and a production management and quality control system. Key market data reported includes 2025 Annual Sales of USD 24.31 million and a monthly output of various sleeves exceeding 40 million meters, indicating a manufacturing scale capable of supporting sizable, recurring orders across its 13 main product lines.

Industry Applications and Customer Base

Sunbow's silicone coated fiberglass sleeving and related insulation products serve customers across three principal sectors. In the home appliance industry, referenced end customers include Haier, Midea, Philips, Panasonic, and Samsung. In the electrical and industrial industry, cases include ABB, Huawei, Siemens, CRRC, and Schneider Electric. In the automotive industry, supply is documented under IATF16949 certified supply to Tesla, BYD, Toyota, Mercedes-Benz, Volkswagen, Geely, and NIO.

Summary

For sourcing teams evaluating a China silicone coated fiberglass sleeving factory, the documented profile of Shenzhen Sunbow Insulation Materials Manufacturing Co., Ltd. combines a defined product range spanning -60℃ to 260℃ operating temperatures, multiple international quality and safety certifications, a stated patent portfolio exceeding 60 filings, and disclosed end-customer relationships across home appliance, electrical/industrial, and automotive segments. These documented specifications and certifications provide a factual basis for buyers comparing suppliers of silicone-based fiberglass insulation sleeving for demanding thermal and electrical protection applications.