the glass has reflection prisms, the light spectrum is reflected in such a way that where there is liquid it is completely opaque and where there is no liquid it is bright. These are mainly used in the petrochemical industry, refineries and general applications.
Chemical propertiesHydrolytic resistanceHGB 1 (ISO 719)
Acid resistanceClass S1 (ISO 1776)
Alkaline resistanceClass A2 (ISO 695)
Chemical compositionSiO2Minimum 80% content
B2O3Minimum 13% content
Na2O + K2OMinimum 4,5% content