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Introduction Leca® LWA is a ceramic lightweight aggregate produced by expanding selected clays; glacial clays tend to contain most of the essential properties allowing expansion when heated to their optimum. Once treated, the excavated clay is passed through a rotary kiln and fired to a temperature of approximately 1150°C. This process expands the material 4 to 5 times its original volume creating ceramic pellets with a cellular inner structure. Leca® LWA was first produced in Scandinavia in the 1930s for the production of lightweight blocks, it was soon discovered that the insulating properties of the material could be of benefit to failing highways and railways throughout Scandinavia and in 1958 following many years of testing Leca® LWA was accepted as a proprietary fill material in the Scandinavian countries. The raw material selection and production of Leca® LWA is strictly controlled to ensure a uniform, high quality product that is structurally strong, stable, durable and inert in addition to being lightweight and insulating. Today Leca® LWA is used in many applications such as Geotechnical Fill, Masonry Blocks, Horticultural Blends, Filtration and Bio-filtration.
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