Claystone is a mineral-based interior plaster developed by ClayLime and supplied as a dry mix for on-site application. The product is formulated from clay, mineral fillers, cementitious components and small quantities of polymer additives. It is designed for interior decorative wall finishes and offers a stone-like appearance once cured. The plaster is applied manually and forms a rigid mineral surface integrated with the substrate. Performance data relating to fire behaviour, acoustics and mechanical strength are not published by the manufacturer. Third-party material assessment documentation identifies the presence of substances classified as hazardous to health during handling, requiring appropriate protective measures. Manufacturing and supply are European-based, with distribution through ClayLime’s international network.