BONETTI Sight glasses for level gauges grant the best chemical and physical properties, holding a very precise place as for chemical composition within the very large group of "Borosilicate Glass" which is suitable for many application.

Round glasses for bicolour level gauges are in "Aluminium-Silicate". Such type of material can be provided also for long glassess (transparent type from size 3 to size 9) in case of very severe applications.

Each individual BONETTI sight glass is manufactured by moulding, using only the inside of the melted part and removing the whole external part in order to obtain best quality glasses, pratically with no striae.

Chemical and mechanical resistance of BONETTI sight glasses is due also to their heat treatment, and all events they show the following properties:

Hydrolytic resistance is particularly important for glasses fitted on steam boiler level gauges at low and medium pressure.

In BONETTI sight glasses special attention is paied to lenght, width, thickness and especially flatness tolerences. From the latter point of view BONETTI sight glasses have very strict tolerance values, definitely lower than must of the ones on the market.

What above ensure less stress and longer life of glass and joints.

Features:

• HIGH TRANSPARENCY
• COLOURLESSNESS
• NO INCLUSIONS
• NO INTERNAL STRIAE
• REGULAR POLARIZATION
• THERMAL SHOCK RESISTANCE