Sightglass Mica disks

Protection against corrosion and heat
To minimize the influence of corrosive media or high temperatures on the glass disk, all sightglass with a smooth surface can be equipped with a mica disk.
This almost completely eliminates glass surface erosion.

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Glass removal mm / month without mica

We supply only high-quality Muscovite natural mica for use in steam and condensation systems.

Mica (Glimmer) is a clear transparent mineral, it is temperature resistant up to a constant working temperature of 550 ° C and has a melting point of approx. 1200 °C. In addition, mica is resistant to almost all media such as bases, alkalis or acids.

Mica plates protects glass from high pressures, temperatures and erosion of the surface and thus increases the service life or maintenance intervals of your sightglasses.

Our mica discs consist of Muscovite natural mica (clear quality) and have almost no influence on the view of your production process. Moreover, mica discs significantly increase the temperature resistance and life span of your sightglass.

Glass in a sightglass has wear!

Many know that a sightglass wear, but how much and when the glass should be replaced is less known?

Here is the answer to this question:

Wenn we take the most applied hardened borosilicate glass. In the graph you see how many millimeters per month this glass erods at a certain temperature and pH. For example, a sightglass with borosilicate glass in an application where the medium is 170 °C and with a pH of 10, the glass rubs 0.2 mm per month. This does not seem to be much, but that is about 2.4 mm in a year. At 200 °C., this is 8.4 mm. And that is very much !!!

In general it can be said that the glass of a sightglas erods faster at a pH higher than 7 (lye). Glass is well resistant to acids but less to alkalis.

Roughly speaking, we advise, in consultation with the manufacturer of the sightglasses, replace the sightglass that is used under extreme conditions every 6 months. In normal conditions, we recommend replacing the sightglass every two years.

How can we extend the service life of the sightglass?

Of course you can do little to change the process and the medium. How can we extend the service life of asightglass so that less replacement is necessary?

In many cases, this can be done by using mica or glimmer. For steam and corrosive media we recommend always a mica plate to protect the sightglass!

Mica is a mineral that can be found in volcano rock. It has an extremely high temperature resistance and is extremely durable.
Only a very thin plate of mica of a few tenths of a millimeter with the same size as the borosilicate glass can extend the life to up to three times.

Cost wise worth consideration!

Tip: Order your replacement glass with the purchase of the sightglass

You will save order and shipping cost for a single replacement eyeglass when you order it with the sightgass. You can put the replacement eyeglass in the box on the shelf until you need it. This also prevents unforeseen delivery times and maintenance planning problems.


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