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Silicone Rubber Composite Insulator

Silicone rubber insulators—available as suspension, post, line, shed, hollow, anti-pollution, weathershed, and insulation housing types—offer superior contamination flashover resistance through hydrophobicity and hydrophobic transfer. They are corrosion-resistant for stable operation in acidic/alkaline environments. Lightweight, high mechanical strength, impact toughness, minimal maintenance, stable dielectric performance, and anti-pecking properties distinguish them from ceramic or glass alternatives.

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    Product Details
    Technical Specifications – Insulator
    Parameter Requirement
    Mechanical Performance
    Maximum working load – horizontal, perpendicular to track (transverse) 2 kN
    Ultimate failure load – horizontal, perpendicular to track (transverse) ≥ 10 kN
    Maximum working load – horizontal, parallel to track (longitudinal) 2 kN
    Ultimate failure load – horizontal, parallel to track (longitudinal) ≥ 10 kN
    Maximum working load – vertical 2.5 kN
    Ultimate failure load – vertical ≥ 12.5 kN
    Electrical Performance
    Full-wave lightning impulse withstand voltage (peak) ≥ 50 kV
    1 min power frequency dry withstand voltage ≥ 40 kV
    1 min power frequency wet withstand voltage ≥ 20 kV
    Artificial pollution withstand voltage ≥ 5 kV
    Creepage distance ≥ 180 mm

    Silicone rubber insulators constitute a comprehensive product family encompassing suspension insulators for overhead line support, post insulators for busbar and switchgear mounting, line insulators for distribution networks, shed insulators with optimised weathershed profiles, hollow insulators for apparatus bushings, anti-pollution insulators tailored for heavily contaminated sites, weathershed insulators designed for extreme climatic exposure, and insulation housings that encapsulate and protect internal conductive components. All variants share a common material platform: a fibreglass-reinforced plastic core (where applicable) overmoulded with high-grade silicone rubber, terminated with metal end-fittings.

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    Structure
    Distinctive advantages:
    Superior contamination flashover resistance – Silicone rubber exhibits inherent hydrophobicity and hydrophobic transfer, preventing continuous conductive water films on the surface, substantially raising flashover voltage and reducing pollution related outages.
    Lightweight – Considerably lower mass than porcelain or glass equivalents, easing handling, storage, and installation, while reducing transport costs and tower loading.
    High mechanical strength – The FRP core provides excellent flexural, tensile, and impact resistance under heavy mechanical loads.
    Impact toughness – Elastomeric nature resists shattering from handling or projectile strikes, unlike brittle ceramic or glass.
    Maintenance-free or minimal maintenance – Sustained hydrophobicity eliminates routine washing, reducing operational expenditure and service outages.
    Corrosion resistance – Withstands acids, alkalis, and industrial pollutants, ensuring dependable service in chemical plants, coastal zones, and other aggressive environments.
    Stable dielectric performance – Retains consistent insulating properties across wide climatic variation—humidity, temperature, rain, fog—enhancing system reliability.
    Anti pecking – The resilient housing offers a degree of resistance against bird pecking damage, mitigating avian related faults.

    Quality Assurance

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    Changmei Technology has designed, manufactured, and exported silicon rubber insulator for over 20 years. Our products are installed on more than 10 tram lines across major Chinese cities like Shenzhen, Wuxi. 

    Before leaving our factory, Tram rail fastener will be tested strictly according to standard requirements . For customers who require more, we carry out type tests at our in house testing centre. 
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    Custom Mould Design & Manufacturing

    – In-House, Start to Finish
    Our Mould Engineering Department operates a full digital workshop equipped with more than 20 CNC machines, including machining centres, spark eroders, and wire cutters. This allows us to design and manufacture a wide range of moulds for the rail transit industry – injection moulding, rubber, SMC, and specialised types such as auto-core-pulling bush moulds.

    Annual output stands at 300 sets of moulds and tooling.

    If your project calls for a non-standard shape for Elastic Ballast Mat, a special material, or a unique production feature, we have the equipment and the experience to deliver.
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