EducaciÛn nutricional en el medio comunitario: A propÛsito de una iniciativa en el Parque Infantil de Navidad de Bilbao

An aluminosilicate transparent glass has corrosion resistance in the form of mass loss of 4.0 mg or below per 1cm2 of the surface of a specimen upon holding the specimen for five hours in sodium hydroxide solution having concentration of 300 mg(L under test pressure of 50 MPa at 250° C. The glass has a coefficient of thermal expansion within a range from 35x10-7/° C. to 50x10-7/° C. within a temperature range from 100° C to 300° C. The glass has also powdered glass mass loss rate of 0.1% or below in terms of water resistance, acid resistance and alkali resistance.