Smarter insulation for smarter fencing

In the world of electric fencing, durability, performance, and sustainability are everything. Enter Durashield™ from Strainrite.

Durashield isn’t just another plastic shell. It’s the result of thoughtful – Strainrite – engineering, deep materials science, and real-world testing. Whether you’re upgrading an existing line or specifying your next build, Durashield is designed to make the job easier, the fence stronger, and the environmental impact smaller.

Redefining durability

Pre-fitted to Strainrite’s trusted Cliplock and XT1 strainers, Durashield delivers rugged performance – especially in wet conditions, where lesser insulators often fail. It significantly outperforms both our previous models and leading competitors in high-voltage testing, thanks to its unique interlocking join design and a body shape inspired by high-voltage transmission insulators.

The result? Less arcing, less breakdown, and longer service life – even under sustained exposure to harsh sun, rain, and dirt.

Retrofit ready

You don’t need to start from scratch to upgrade. Durashield can be retrofitted to existing Cliplock wire strainers, avoiding the cost and hassle of full replacement. And if a shell is damaged, just replace the shell – not the entire strainer. It’s a smarter, more sustainable way to manage wear and tear in the field.

Material matters

Not all plastics are created equal. While some insulators still rely on basic polymers, Durashield is made from UV-stable ASA (Acrylonitrile Styrene Acrylate) – a premium-grade material commonly used in exterior car parts, playgrounds, and window frames.

ASA is prized for its exceptional resistance to UV, moisture, impact, and temperature fluctuations, making it ideal for long-term outdoor use. And there’s more – 60% of the ASA in Durashield comes from post-consumer recycled material, supporting a more circular economy without compromising strength or reliability.

Debunking the “Join” myth

Some have raised concerns that the “join” in Durashield’s two-part shell might collect dirt and allow current to track. But real-world testing paints a different picture.

In extreme simulations of wet, dirty farm conditions, Durashield showed no failure through the front join – even at 12kV–15kV. That’s because the interlocking tabs in the front join create a long, non-linear tracking path, not an open gap. In short: no shortcuts for electricity.

Durashield consistently outperformed all plastic-bodied insulated strainers tested, including leading competitors.

The verdict

Durashield is more than just an insulator – it’s a smarter, stronger, and more sustainable way to build and maintain electric fencing. With its next-level wet weather performance, replaceable shells, and ASA-engineered durability, Durashield is made to last.

Durashield™. Built for the fence. Engineered for the future. Proudly made in New Zealand.

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