Trinity Expanded Shale and Clay (ESC) produces and distributes rotary-kiln expanded shale and clay lightweight aggregates made from natural shale and clay. This building material offers excellent results in both quality and performance in a variety of engineering and horticultural projects. Product applications include highway and road surfaces, concrete bridge decks, high-rise buildings, concrete products, geotechnical applications; and for horticultural projects as a soil amendment or conditioner. Trinity Expanded Shale & Clay (ESC) is one of the largest producers of rotary kiln expanded shale and clay lightweight aggregate in North America, and the largest supplier of ESC aggregates west of the Mississippi River.