Dumico sight glass and level gauge mica is made from the mineral muscovite mica, a mineral with unique properties. It is a relatively thin and almost completely transparent material (depending on quality). It protects your sight glasses and transparent gauge glasses against erosion by the medium. It also increases the temperature resistance of the glasses with 20°C.
Mica is resistant to almost all mediums, such as alkalis, chemicals, gases, alkalis, oils, acids. For high temperature and pressure applications, mica can only be used in place of (level) gauge glass. Depending on the required pressure there are several loose mica sheets stacked together (mica blocks).