Fiberglass cable trays are typically manufactured using pultrusion, compression molding, or resin transfer molding techniques. Pultruded components maintain a glass fiber to resin content of 45–65% by weight, while molded components range from 25–45%. Flat sheets have slightly lower fiber content (35–45%). All materials include UV inhibitors to resist degradation and are fire retardant, achieving a Class 1 flame spread rating (≤25) per ASTM E-84. Conductive resin systems may include carbon additives to dissipate static electricity, meeting ABS surface and volume resistivity requirements for marine installations .
Fiberglass trays are available in polyester and vinylester resins, with a surface veil applied during pultrusion to enhance chemical resistance and UV protection. Vinylester resins offer superior corrosion resistance, while polyester resins provide cost-effective durability. Custom colors are available upon request .
Ladder-type trays consist of two longitudinal side rails connected by transverse rungs, providing high strength-to-weight ratios. They are lightweight (approximately 1/3 the weight of steel trays) yet maintain comparable or superior load capacity. Solid-bottom trays are available for sensitive or control wiring, with flat fiberglass covers bonded to the bottom. Siderail profiles, such as "E" or "Z" types, allow for space-efficient installation and easier cable loading .
Load ratings are determined according to IEC 61537 and NEMA FG 1-1993, with tables or diagrams showing load vs. span based on maximum deflection. Trays are designed with a 1.5 safety factor relative to allowable working load. Elevated temperatures can slightly reduce rigidity; testing at 100–125°F ensures reliable performance in industrial or outdoor environments .
Fiberglass cable trays comply with ASTM E-84, ASTM D-635, NEMA FG 1, and ABS rules for marine and industrial installations. They are widely used in offshore oil & gas platforms, chemical plants, refineries, and industrial facilities where corrosion resistance, fire safety, and structural reliability are critical . These specifications ensure that high-speed fiberglass cable trays provide a robust, safe, and long-lasting solution for demanding electrical infrastructure applications.
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