Dumico sight glass and level gauge mica

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).

Dimensions and designs

We deliver mica in any size and type. Level gauge mica comes standard with rounded or straight ends, but also with holes and other openings. We provide mica packages for devices without glass. Mica discs for sight glasses are available in different versions.

For most models, we supply a great variety of viewing and gauge mica directly from stock.

Applications and installation

Transparent level gauge glasses: Mica is suitable for all brands and types of level gauges. Mica is mounted on the medium side in order to avoid glass attack, it extends the lifetime of the gauge glass. Mica is a valuable investment: it reduces the number of glass changes.

Reflex level gauge glasses: Mica is used on the outside of the reflex level gauge glass to reduce thermal shock by temperature fluctuations and to prevent glass damage. For this application mica cannot be mounted on the medium side, because of the lack of reflection.

Round sight glasses: protects round sight glasses, traps, sight glass fittings, flow meters etc. Mica is mounted on the medium side.

Mica Package: as replacement for glass, due to high pressure and temperature requirements. The thickness is determined according to the required pressure. For example, a 1.6 mm thick mica package is resistant to 320 bar pressure!

Technical information

  • Resistant to almost all common mediums.
  • Suitable for continuous temperature of 500° C.
  • Melting point at approximately 1.250° C.
  • Resistant to high pressure, depending on thickness.
  • Increases temperature resistance level of glasses.
  • Almost invisible.
  • If mica is not resistant to a certain medium, the more thick material Kel-F or FEP should be used instead.