Engineered to withstand extreme environmental parameters while safeguarding global grid systems.
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View SpecificationsFounded in December 2002 with a registered capital of 508 million Yuan, Jiangxi QOCI Electric Co., Ltd. stands as a premier manufacturer of high-strength glass insulators. Located in the renowned industrial park of Luxi County, Pingxiang, Jiangxi Province, our manufacturing footprint covers 100 mu (70,000+ m²). Over two decades of technical evolution has empowered our facility to supply globally certified, high-performance insulation technologies for HVAC & UHV DC grids.
Serving world-class green grids.
Zero-defect target standard.
Plant Area (m²)
Annual Output (Tons)
Engineering Technicians
Invention & Utility Patents
A comprehensive look into industrial engineering, material chemistry, and structural execution.
High-quality tempered glass processes rely on precise thermal toughening operations. Under severe heating (approx. 680–700°C) followed by rapid air quenching, compressive stresses develop on the surface while tensile forces reside in the core. This stress profile gives the glass its superior mechanical properties.
Unlike composite alternatives, toughened glass possesses a crucial self-monitoring mechanism: when damaged, the unit shatters into tiny, non-hazardous particles. This "spontaneous shattering" makes faults visually obvious during ground-based inspections, eliminating the need for expensive diagnostic tests.
Even in the rare event of shell breakage, the remaining cap-and-pin stub retains up to 80% of its rated mechanical strength. This prevents immediate line drops and ensures grid integrity until routine maintenance can take place.
Our factories utilize ultra-pure silica sand blended with high-grade soda ash and limestone to yield glass with exceptional thermal stability. Melting takes place in state-of-the-art oxygen kilns at temperatures exceeding 1500°C. This ensures complete homogenization, minimizing microscopic impurities like nickel sulfide (NiS) inclusions, which are the main cause of spontaneous failure under mechanical load.
Mechanical strength is verified through rigorous type testing conformant to international IEC standards (IEC 60305, IEC 60383). Each insulator disk is matched with highly robust malleable iron caps and forged steel pins, bonded together using premium aluminate cement. This prevents galvanic corrosion and ensures dependable load transfer over decades of operation.
Continuous research and development has led to specialized profiles tailored to extreme conditions. Aerodynamic shapes allow wind and rain to naturally wash away industrial dust and coastal salt deposits. This prevents dangerous dry bands from forming and protects against flashover incidents.
Our factories are equipped to supply a range of profile configurations, including double-shed, triple-shed, and silicone-coated (RTV) varieties. These designs are highly effective in heavily polluted areas, saline soils, and high-altitude locations, providing reliable service under challenging environmental conditions.
Explore our wide range of insulator profiles, designed to meet specific environmental and mechanical challenges.
Features a leakage distance that exceeds the standard values defined in IEC 60305. The insulating body is designed with shallow, well-spaced ribs that facilitate self-cleaning under wind and rain.
Characterized by deep, widely spaced under-ribs that prevent electrical bridging between adjacent sections. Especially suited for coastal areas exposed to salt fog and industrial pollution.
Designed without under-ribs and with a larger disk diameter to prevent the accumulation of dry pollution, sand, and dust. Highly effective in desert zones and areas prone to heavy icing.
Features two external ribs that minimize dust build-up and enable easy manual washing. Provides performance equal to anti-pollution models in extremely sandy or industrial regions.
Incorporates three layers of isolated umbrella discs to extend the creepage path. An ideal solution for high-altitude zones, coastal corridors, and UHV installations.
Features a Room Temperature Vulcanized (RTV) silicone coating that maintains hydrophobicity and minimizes leakage currents, reducing maintenance costs in polluted areas.
Serving low-voltage, high-voltage, extra-high voltage, and ultra-high voltage AC & DC systems across diverse geographic regions.
Located in Luxi County, Pingxiang—the core of China's electrical ceramics manufacturing corridor—our facility delivers outstanding process control and supply chain stability.
Automated high-pressure pressing units ensure uniform dimensions and density in the raw glass shells, preventing defects that can lead to physical failure under load.
Every batch undergoes stringent puncture, power frequency dry/wet flashover, and impulse voltage testing to guarantee dielectric performance before dispatch.
Using advanced furnace heating systems helps lower fuel consumption while maintaining precise, high-temperature thermal control to produce uniform, defect-free glass melt.
Our location in Pingxiang, Jiangxi Province, provides access to an established network of raw material suppliers, high-capacity transport infrastructure, and technical expertise. This regional ecosystem enables us to keep lead times short, maintain competitive pricing, and scale production quickly to meet large project demands.
This logistics network ensures secure shipping from our warehouse to major sea and land ports. By maintaining strategic inventories of finished components and raw glass shells, we minimize the impact of international shipping challenges for our global clients.
To ensure dependable performance in critical environments, our processes are certified under ISO 9001 (Quality Management), ISO 14001 (Environmental Protection), and ISO 45001 (Occupational Health & Safety). Our products comply with IEC, ANSI, BS, and GB standards, with certifications issued by independent laboratories like KEMA and CESI.
Our quality checks cover raw material analysis, temperature-monitored annealing, cold-to-hot thermal cycle testing, and mechanical failing load verification. This thorough approach ensures that each insulator assembly meets the high reliability standards required for modern grids.
Tested, proven, and trusted by global utility companies, transmission grid operators, and EPC contractors.
Expert answers to common questions about tempered glass production, electrical performance, and field usage.
Tempered glass offers higher mechanical strength, lower weight per string, and simple visual fault detection. Unlike porcelain, which can develop hidden internal cracks, a failed glass insulator shell shatters completely. This eliminates the need for manual measurement inspections.
Spontaneous shattering is typically caused by internal impurities, such as microscopic Nickel Sulfide (NiS) inclusions. High-quality processes minimize these inclusions through raw material checks and controlled cooling. When a shell shatters, the remaining stub retains its rated mechanical load capacity, ensuring the transmission line remains secure.
RTV silicone coatings combine the high mechanical strength of toughened glass with the hydrophobic properties of silicone rubber. This design is highly effective in heavily polluted areas, coastal saline zones, and regions with high humidity, as it helps suppress leakage currents and prevent dry band flashovers.
Open profiles and aerodynamic shapes are designed for sandy areas. These profiles feature fewer or shallower under-ribs, allowing wind and rain to naturally clear away dust. This minimizes pollution accumulation on the lower surface, reducing the risk of flashovers in dry regions.
Yes, our entire catalog is manufactured in accordance with IEC 60305, IEC 60383, and ANSI C29.2 specifications. Our designs undergo complete type, sample, and routine testing to ensure they meet the quality demands of global utilities.
Located in Pingxiang, Jiangxi Province, our manufacturing center benefits from local sand mining operations, dedicated processing mills, and proximity to major shipping ports. This secure logistics network allows us to provide consistent, timely delivery even during periods of global shipping disruption.
Stay informed about our latest technical developments, global exhibitions, and project installations.
As the global energy transition accelerates, the importance of electricity, renewable energy, and energy storage technologies is becoming increasingly critical.
Having withstood extreme environmental conditions including icing, high altitude, pollution, earthquakes and typhoons, China's insulator industry is mature.
We encourage you to join us at IEEE PES T&D Conference & Exposition 2026, the powerhouse energy exhibition displaying next-gen power line solutions.
QOCI Electric, a leading global supplier of power equipment and solutions, officially confirmed today its presence at the upcoming Iraq Energy event.
Complete your design requirements by reviewing our high-performance cap-and-pin structural glass insulator solutions.
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