Fiberglass cable trays are significantly lighter than their metal counterparts. This lightweight design makes installation easier and faster. Reduced labor costs are an added benefit. It is manufactured from fiber reinforced polyester or vinyl ester resin so it has high corrosion resistance, long. Enduro cable tray (sometimes called cable ladder) sets the industry standard for high-quality fiberglass cable tray. They. Eaton's B-Line series fiberglass cable tray systems provide an economical support system with superior strength at room temperatures and dependable load bearing capabilities at continuously elevated temperatures. Its core structure includes: Main Frame: Continuous glass fibers are arranged directionally to form a.