Durostone UTR, GPO-3 Polyester Glass

Industry‑standard flame‑resistant electrical insulation

Durostone® UTR is a fibreglass reinforced polyester laminate designed for flame‑resistant electrical insulation applications. Recognised as the industry standard for GPO‑3 materials, it combines high mechanical strength, excellent electrical performance and low smoke generation to deliver safe, reliable performance in demanding electrical environments.

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Application Overview

Durostone® UTR is widely used as a structural and insulating material in electrical equipment where flame resistance and arc‑tracking performance are critical. Typical applications include motors, generators, switchgear and other electrical insulation components requiring certified GPO‑3 performance.

What We Solve For

Electrical systems demand materials that can withstand mechanical loads, electrical stress and fire exposure without compromising safety. Durostone® UTR addresses these challenges by providing flame resistance, arc and tracking protection and structural strength in a cost‑effective, widely specified laminate.

TECHNICAL

Features & Functionality

Functionality & Options

Electrical insulation and structural support components
Suitable for motors, generators and switchgear
Available in sheet form and selected profiles
Easily machined to custom shapes and parts
Cut‑to‑size and fully machined components available

Key Technical Specifications

Fibreglass reinforced thermoset polyester laminate
NEMA Grade: GPO‑3
UL recognised material
UL Temperature Index:
Electrical: 130 °C
Mechanical: 160 °C
High dielectric strength in air and oil
CTI > 600 for excellent tracking resistance
Low water absorption (approx. 0.4%)
Standard sheet size: 1220 × 2440 mm
Thickness range: approx. 0.8 mm to 50 mm

EXPERIENCE

Our Projects Featuring Insulect Industrial Materials

Explore our project highlights to see where Insulect industrial materials are making an impact.
For tailored advice on whether this solution suits your network, please connect with our team here.

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Fortescue Aldoga, New 275kV Substation Switchgear

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Fortescue Future Industries 275 kV Substation Project

ADVANTAGES

Why Choose Durostone® UTR (GPO‑3)

Durostone® UTR offers a dependable, industry‑proven solution for flame‑resistant electrical insulation where safety, performance and value are equally important. As a recognised GPO‑3 laminate, it combines mechanical strength, electrical reliability and low smoke behaviour to support confident material selection in demanding electrical applications.

Industry‑Trusted Standard

As a recognised GPO‑3 laminate, Durostone® UTR is widely specified and trusted for flame‑resistant electrical insulation.

Balanced Performance & Value

It delivers a strong combination of mechanical strength, electrical safety and fire performance at a lower cost than exotic laminates.

Proven Electrical Safety

With low smoke generation, strong arc resistance and excellent tracking performance, UTR supports safer electrical system design.

IMPLEMENTATION

Services & Support

Insulect offers comprehensive services and support for the products we manufacture and specialise in, enhancing value for local utilities, major energy users, equipment manufacturers, and service operators.

LOCAL TECHNICAL TEAM

Our local technical team provides exceptional support and expertise, ensuring quick response times and personalised service to tackle any challenges that may arise during project execution.

ENGINEERING DESIGN

Our team utilises advanced technology and industry knowledge to develop innovative and efficient high voltage switchgear solutions, customised to fit the unique requirements of each project.

PROCUREMENT & LOGISTICS

We facilitate smooth procurement and logistics processes by sourcing from trusted, proven partners and coordinating timely deliveries, ensuring projects remain on schedule and within budget.

TESTING & COMMISSIONING

Professional testing and commissioning support ensures that every high-voltage switchgear system functions safely and reliably, adhering to all regulatory standards and client expectations.

TURNKEY PROJECT DELIVERY

We are able to oversee every phase from concept to completion, providing comprehensive solutions that simplify complex projects and ensure successful outcomes.

FACTORY VISITS

We facilitate client visits to our local manufacturing sites here in Australia, as well as overseas, for initial inspection as well as factory acceptance testing.