ESCSI is the unified voice of the expanded shale, expanded clay and expanded slate industry. ESCSI members include companies, firms and organizations working together for the betterment of the lightweight aggregate industry.
ESCSI offers Producer membership to firms or individuals producing and shipping lightweight aggregates consistently conforming to the current version of Specifications C-330 and C-331 of the American Society for Testing and Materials (ASTM). Such lightweight aggregates shall be produced by expanding and vitrifying suitable shale, clay and slate by the rotary kiln process.
ESCSI offers Associate membership to companies, individuals or organizations that promote or support services to the expanded shale, clay or slate members. Industry associations that support ESCS and whose members include ESCS manufacturers, distributors and suppliers may join as Associate members. Companies or associations that produce or promote alternative products for uses similar to uses of expanded shale, clay or slate are not eligible for Associate membership.