We are one of the world's leading manufacturers of Sight- & Gauge glasses today thanks to our Ilmadur® line. They provide safety wherever processes in boilers, tanks, reactors, vessels and other containers need to be observed visually.
Our worldwide success is due to the outstanding technical characteristics of our borosilicate glass I-420 . This glass has high optical quality for optimum viewing. Furthermore, its extremely high resistance to chemicals and boiler water, as well as its high thermal shock resistance, guarantees long life.

Ilmadur® Sight- & Gauge glasses naturally meet the highest requirements for quality. They fulfill all the conditions set down by international standards such as DIN 7080, DIN 7081,
MIL G 16356 D, BS 3463, JIS B 8211, and the Austrian ÖNorm M 7353/7354.

Our products include:
- Round Sight- & Gauge glasses in accordance with DIN 7080
- Oblong Sight- & Gauge glasses in accordance with DIN 7081/MIL G 16356
- Custom Sight- & Gauge glasses made of borosilicate,
  fused silica or alkali-lime glass

We are an approved and certified manufacturer in accordance with AD 2000-Notice W0. Our approved quality management system for materials manufacturers has been certified in accordance with the European Pressure Equipment Directive, 97/23/EC.