Fossil meal is a product of sedimentary earth which can be used as fill or aggregate in cast cement blocks or insulating mortars. Fossil meal products have good thermal properties and a high moisture absorption rate, making them best suited for insulation of high temperature equipment such as kilns, kettles, hot water tanks, baking ovens and high temperature equipment in industry. They can also be used in walls between rooms as a filler. Having a powder-like consistency, they must be placed between paper sheets so as not to leak out into the room.
Fossil meal mortars are made by mixing fossil meal with limes or cements. Addition of plant fibres is possible up to 30% by weight. Water is added and the ingredients are well mixed together. The mortar is then ready for use on hot water pipes, for example, preferably in several layers, each 1-2 cm thick. A canvas is bound over the last layer, which can be painted or rendered with lime.
Blocks of fossil meal can be made using cement as a binder. It can also be used as an insulating aggregate in brick products.
Fossil meal contains large amounts of silicon dioxide and can be superficially considered dangerous as it can cause silicosis. However, in fossil meal this substance is not crystalline silicium oxides as in quartz, but an amorphous version that is completely harmless. Fossil meal is in relatively widespread use, and causes considerable blemishes on the countryside when extracted. The waste phase does not cause any problems. Unmixed parts can be re-used or can even be left in the natural environment, covered with earth.
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