Molochite™ is produced using china clay from extensive deposits in Cornwall which are primary in nature. These deposits are renowned for their fine quality, consistency and the extent of their reserves. They provide materials that are low in iron and alkali and high in alumina.
Our high-fire, long-soak process for producing crystalline silica-free Molochite in Cornwall (UK) gives a unique set of expansion properties that limit cracking caused by quartz phase changes allowing for consistency and expansion control.
The low, uniform thermal expansion rate of Molochite gives it excellent resistance to thermal shock, while the rough particles gives excellent keying properties for clay or chemical bonding.
Molochite is a high grade material with consistent composition and physical properties. It is available in a number of controlled gradings that are suited to a wide range of manufacturing techniques for producing the required alumino-silicate refractories at common firing temperatures.
Molochite – which contains no crystalline silica – is the “standard” calcined clay component of kiln furniture bodies, providing a low level of firing contraction. This means that close dimensional tolerances can be met, as well as an unparalleled stability of shape at high temperatures. Numerous formulations are used in kiln furniture products, depending on their application.
The calcination of Molochite at temperatures over 1500°C not only ensures ensures thermal stability but also gives good creep resistance at normal use temperatures , i.e. up to 1350°C. Its rough grain surface provides an excellent keying surface for clay/talc bonds.
Molochite, contains no crystalline silica and thus imparts a low and even thermal expansion and excellent dimensional stability at service temperatures, leading to extended product life time.
Molochite has low ferric oxide content and is completely free from of nodular iron. These properties make it the ideal choice for a wide spectrum of applications from glass refractories to blast furnace bricks.
Molochite with its excellent thermal stability and even particle size distribution is a particularly suitable ingredient for castables, mouldables, and ramming and gunning mixes where 42-44% alumina calcinates are required.