Chemical Resistance

Chemical Resistance

The chemical resistance of glass is better than that of all other known materials. It shows resistance to water, acids and alkalis, salt, organic substances as well as chlorine and bromine. Hydrofluoric acid, concentrated phosphoric acid and strong alkalis attack the glass surface at higher concentrations and temperatures.


The following are typical results of tests undertaken according to international standards: 

1. Hydrolytic resistance

Glass grains (300 - 500 microns)

acc. ISO 719 (98°C) Water attack: < 0,01 mg Na20/g grains

Class ISO 719 - HGB 1

acc. ISO 720 (121°C)

Class ISO 720 - HGA 1

2. Acid Resistance

Resistance acc. DIN 12116 Acid Class 1

Resistance acc. DIN/ISO 1766 = Loss in weight < 100 μg Na20/dm2

3. Alkali Resistance

Resistance acc. DIN 52322 / ISO 695 Class A2