Aluminium silicate glass

Tremolite Borosilicate glass Aluminium silicate glass... 

E. Bischoff, M. Riihle, O. Sbaizero, A.G. Evans Microstructural studies of the interfacial zone of a Sic-fiber-reinforced lithium aluminium silicate glass-ceramic , J. Am. Ceram. Soc. 72, 741-745 (1989)... 

Higher resolution aluminium-27 and silicon-29 NMR spectroscopy of glasses and crystals along the join calcium magnesium silicate-calcium aluminium silicate (CaMgSijOj-CaAljSiO,). American Mineralogist, 71, 705-11. 

Aluminium is the third most abundant element in the earth s crust and is used widely in the manufacture of construction materials, wiring, packaging materials and cookware. The metal and its compounds are used in the paper, glass and textile industries as well as in food additives. Despite the abundance of the metal, its chemical nature effectively excludes it from normal metabolic processes. This is due largely to the low solubility of aluminium silicates, phosphates and oxides that result in the aluminium being chemically unavailable. However, it can cause toxic effects when there are raised concentrations of aluminium in water used for renal dialysis. These effects are not seen when aluminium is at the concentrations usually present in drinking water. There is currently much activity to examine the factors that influence uptake of aluminium from the diet. 

To increase the barrier to oxygen, polymer packaging is coated with impermeable layers of metal or silicate glass. Aluminium, if vacuum deposited, is less than a micron thick. Table 11.4 shows that it reduces the permeability of a PET/ PE composite film by a factor of 10. Such collapsible bags are used inside wine boxes, as a method of increasing the shelf life of the partly consumed wine. 

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