FRE Composites RTRC for Industrial Projects

Engineered for extreme corrosion resistance and UV stability, fiberglass conduit can stand up to any indoor, outdoor, below or above ground environment.

Engineered for extreme corrosion resistance and UV stability, fiberglass conduit can stand up to any indoor, outdoor, below, or above-ground environment. Fittings are Class 1, Division 2, which can be subject to physical damage per NEC®.

The material's benefits in place of steel and aluminum are becoming increasingly popular to several industries, including industrial.

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FRE's Fiberglass Fittings Specifications

All FRE's Conduits and Fittings are UL listed against UL 2515A following laboratory tests by Underwriters Laboratories (UL file #E53373). Products comply with the NFPA 130 and NFPA 502 for exposed installations, FT4 rated (CSA).


Our fittings consist of continuous E or E-CR glass roving in a cured corrosion-resistant phenolic resin system, pigmented with UV inhibiting carbon black dispersed homogeneously. It is manufactured for use at temperatures ranging from –40 °F (-40 °C) to 1850 °F (1010 °C) and is not suitable for resorcinol resin-based systems.

All fittings, adapters, and elbows are constructed in the same manner as the conduit (filament wound) and have a socket depth as well as an inside bell design consistent with the conduit.

Sizes & Wall Thicknesses

Conduits and fittings are manufactured with nominal wall thicknesses as outlined below:

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Industrial Projects Overview

Along with being corrosion-resistant, a feature that makes fiberglass particularly appealing for industrial projects is that it is so lightweight. Compared with PVC-coated rigid steel conduit, fiberglass conduit weighs around ten times less.

Using heavier conduit requires additional time and manpower, especially on a large industrial project, making the lightweight nature of fiberglass a popular choice for an easy and quick installation. This is particularly useful when project managers and engineers are facing a time-constrained project. A lighter product also means lower freight costs!

The time-saving qualities and low material cost of fiberglass present ample opportunity for project managers to save money on their industrial projects.

How Do Conduits Play a Role?

An electrical conduit is an integral part of the electrical system, providing a durable tubing enclosure that protects the electrical wiring. The conduit can be made from various materials, with the best option depending on the specific scenario.

Conduit is required where wiring is exposed and might be subject to damage. In an industrial setting, wiring is often exposed to corrosion from moisture, saline, and chemicals, meaning a conduit such as fiberglass is needed to provide protection in harsh environments. All conduit must be installed in accordance with the National Electrical Code (NEC) and all applicable local code rules.

Rigid Steel vs. Fiberglass Fittings (RTRC)

Conduit isn't always high up on the list of importance for electrical engineers and project managers, but with longevity and quality the key to a successful project, all materials involved need to be closely considered, including the choice of a conduit.

So, which conduit material should you be using for your industrial project?

Conventional conduits are fashioned from steel or steel coated in a plastic called Polyvinyl Chloride (PVC).

Amongst industry professionals, it's perceived that PVC-coated steel is the leading conduit choice. However, research has shown that fiberglass has several qualities that outperform its adversary on several occasions.

In recent years, there has been an increased effort to streamline installation while ensuring long-term performance. As such, there has been an increased number of industrial fiberglass conduit installations. Here's why:

Faster installation

Fiberglass is lighter and easier to handle than steel, meaning that preparation and installation time is significantly reduced. Fiberglass Conduits are offered in 20' sections from 2 to 6" IPS/ID of diameter compared to 10' for steel conduits. Also, even with their lengths doubled, the fiberglass conduit is at least 2X-5X lighter than steel. Result: Less human resources are needed for a faster installation process, and no special tools are required for the installation.


When burned, conduits composed of PVC-coated rigid steel release toxins such as chlorine and bromine into the environment. This creates safety risks to employees as well as environmental and legal risks. Conversely, the burning of fiberglass conduit is halogen-free - sparing toxicity in the immediate environment. FRE Composites Inc also offers its BreathSaver® product line that offers extended fire resistance.


Due to its limited corrosion resistance, PVC-coated rigid steel's lifespan in a heavy industrial environment can be as short as two years. Fiberglass conduit generally offers the widest range of corrosion protection of any conduit and can therefore last as long as three-times the lifespan of PVC-coated rigid steel conduit. A fiberglass conduit simply can't corrode.

Less expensive

Installing PVC-coated rigid steel conduit is more difficult than fiberglass because of its weight and reduced length, making associated labor costs higher. Combine this with the cheaper initial material costs; fiberglass is a less expensive conduit option than rigid steel.

Why Choose FRE Fiberglass Fittings (RTRC)

Engineers often use a spec list from a previous project for a new assignment. But when it comes to selecting the conduit material for your industrial project, one size doesn't fit all. Every project has its own unique challenges, and a certain type of electrical conduit will offer the best solutions for their project.

FRE Composites has been designing, developing, and producing the best fiberglass products in the business since 1958. Our below ground, underwater, HazGuard™, and BreathSaver® products are designed to provide industrial markets with a reliable, easily installed carrier for buried, encased, and exposed applications.

For more comparative information on fiberglass conduit systems and coated steel, please visit: