ProGlass by Jensen – Fiberglass Utility Products in Shelton, Washington

Non-Conductive Fiberglass Solutions for Dry Utility Applications

Electrical non-conductive materials are often specified in dry utility environments where electrical safety, insulation, and material performance are critical. Fiberglass is commonly selected because it does not conduct electricity in the same way as metal and does not introduce conductive properties associated with reinforced concrete.

For utility installations, fiberglass offers electrical insulation benefits while maintaining structural performance. These characteristics make fiberglass suitable for applications where equipment access, worker safety, and electrical separation are important design considerations.

Fiberglass Trench Covers

Fiberglass trench covers manufactured by ProGlass are used to protect utility corridors, vault access points, and substation environments where access to underground infrastructure is required.

These trench covers are engineered to meet application-specific load requirements and may include traffic-rated capability, slip-resistant surfaces, and resistance to corrosion. Compared to heavier materials, fiberglass trench covers are often specified where electrical isolation, reduced weight, or easier handling is needed during installation and maintenance activities.

Fiberglass Transformer Pads

Fiberglass transformer pads provide structural support for pad-mounted electrical equipment, including single-phase and three-phase transformers. These pads serve as a stable foundation while helping maintain electrical separation between equipment and surrounding conditions.

Because fiberglass is non-conductive and resistant to corrosion, fiberglass transformer pads perform well in a range of environmental conditions. In certain utility installations, fiberglass pads are specified as an alternative to concrete where reduced weight, electrical insulation, or site-specific conditions influence material selection.

Additional Fiberglass Utility Products Manufactured at ProGlass

In addition to trench covers and transformer pads, the Shelton facility manufactures other fiberglass utility components used in dry utility systems, such as cable pedestals and related enclosure products.

This facility supports consistent fiberglass manufacturing processes focused on durability, electrical performance, and utility application requirements, rather than offering a broad catalog of unrelated products.

Why Utilities Specify Fiberglass Over Traditional Materials

Fiberglass is commonly specified alongside—or in place of—traditional materials such as concrete or metal when project requirements call for specific performance characteristics.

Utilities may specify fiberglass when reduced weight improves handling and installation, when corrosion resistance is needed in challenging environments, or when electrical insulation is a priority. These advantages make fiberglass a practical option in select applications, depending on project design, loading conditions, and site constraints.