MAXOS® safety sight and level gauge glasses made of SUPRAX® 8488 are perfect for temperatures up to 300 °C. For higher operational temperatures we recommend safety sight and level gauge glasses made of aluminosilicate glass. These are used due to a Tg of 630 °C in applications with high temperatures up to 375 °C. It is mandatory to protect the inner side of the glass (i.e. side facing steam or liquid) with mica shield to avoid fast chemical attack.