Aluminosilicate is offered for flat gauge and port gauge glasses when used in applications which exceed the temperature limits for borosilicate glasses
 
It is less resistant to chemical attack and should therefore be used with mica protection when exposed to saturated steam and alkaline solutionsSpectraglass offer two types of Aluminosilicate glass:CL - With an expansion α= 4.7x10-6 °C and a transformation temperature 715°CBAK50 - With an expansion α= 4.6x10-6 °C and a transformation temperature 629°C