Manufacturers of Haydite expanded shale lightweight aggregates for structural concrete and masonry applications, soil amendments, and ground covers. Hydraulic Press Brick Company incorporated in 1868 as a manufacturer of Haydite, an expanded shale lightweight aggregate. The founder of the Company, Mr. E. C. Sterling, developed the concept of molding dry clay with a hydraulic press in 1864.

Supplies pumice aggregates used to produce lightweight concrete building materials. Pumice - Suppliers of pumice, lightweight concrete, lightweight backfill, lightweight aggregate and pre-cast block products. Pumice is a light, porous igneous rock that is formed during volcanic eruptions. The texture of pumice resembles a sponge with its many hollows and cavities. Because of its porous nature, pumice is a lightweight material that is an ideal replacement for heavyweight concrete products. Lightweight pumice aggregate can reduce the weight of precast by up to one-half. Since its development in the early nineteen hundreds, Pumice structural lightweight concrete has been used extensively in high-rise buildings, commercial buildings, hospitals, schools, government housing and major shopping centers.