Composite Polymer Insulators
At Venkateswara Suppliers Pvt. Ltd. (VSPL), we specialize in designing and manufacturing high-quality Composite Polymer Insulators for modern power distribution and transmission systems across India.
Engineered with FRP cores, silicone rubber housing, and precision metal fittings, our polymer insulators ensure superior mechanical strength, pollution resistance, and long-term reliability — truly living up to our promise of being Safe. Strong. Durable.
What Are Composite Polymer Insulators?
Composite Polymer Insulators (also known as Silicone Rubber Insulators) are advanced electrical components made using a fiberglass-reinforced plastic (FRP) rod, silicone polymer sheath, and galvanized metal fittings.
They replace traditional porcelain or glass insulators with lightweight, non-brittle, and corrosion-resistant alternatives suitable for harsh Indian climates.
Advantages at a glance
Suitable for polluted and harsh environments
Resistance to breakage and vandalism
Superior tracking and erosion resistance
Resistance to earthquake
Low leakage current
Environment friendly process of manufacture
Good mechanical and electrical characteristics
Light in weight - handling and transportation advantage
Easy to install and maintenance free
Excellent hydrophobicity, hence no need to clean
Why Choose VSPL Composite Polymer Insulators
With over 25 years of electrical manufacturing experience, Venkateswara Suppliers Pvt. Ltd. delivers polymer insulators that meet IEC 61109, IEC 62217, and ANSI C29.13 international standards.
Our advanced Palakkad facility features in-house FRP pultrusion, HTV & LSR silicone moulding, and automated quality testing up to 200 kV.
Key Benefits:
Salient Features
VSPL insulators have qualified in 5000 hours Accelerated Ageing test as per IEC: 62217.
VSPL insulators have qualified in 1000 hours Tracking and Erosion test as per IEC: 62217.
Use of both HTV and LSR grades of silicone rubber depending upon the requirement of the product.
FRP rods are manufactured in-house using ECR grade Glass Fiber and Hydrolysis Resistant Epoxy Resin System.
The VSPL make composite silicone rubber insulators meet the requirements of IEC: 61109, IEC 62217, IEC: 60815, IEC: 62231, IEC: 61462, ANSI C29.13 and any relevant international standards.
Robust packing for easy handling, transportation and site storage.
Test Facilities
Our state-of-the-art testing laboratory ensures every product meets international quality standards
Silicon Rubber
- Tensile Strength
- Percentage Elongation
- Tear Strength
- Specific Gravity
- Hardness (Shore A)
- Inclined Plane Tracking & Erosion Test as per IEC:60587
- Moulding Machine for Making Rubber Sheets
FRP
- Dry Penetration
- Water Diffusion
- Percentage of glass content
- Water Absorption
- Brittle Fracture Resistance
- Bending Load Test
- Specific gravity
Metal Fittings
- Uniformity of Zinc coating
- Mass of Zinc coating
Insulators
- Non-Destructive Testing for bonding in the insulator
- Ultrasonic Crack Detection During Crimping
- Horizontal tensile test machine for test on long rod insulator including routine testing
- Bending test machine for Post and Railway Insulators
- High Voltage test up to 200kv
- Assembled core load-time test on all types of long rod insulators
FAQs
We offer 11 kV, 15 kV, 22 kV and 33 kV pin insulators for distribution lines.
Yes — they offer higher impact strength and resist breakage during transport or installation.
No. Their silicone rubber housing is hydrophobic and self-cleaning, ideal for dusty or humid zones.
Yes. Each unit undergoes routine mechanical, electrical and ageing tests before dispatch.
Absolutely — our Palakkad facility develops custom moulds and fittings within short lead times.
Get a Quote
Contact us today to learn more about VSPL's Composite Polymer Insulators, including product details, pricing, and custom solutions.
Business Hours
Mon - Sat: 9:00 AM - 6:00 PM