When materials such as metals and plastics have reached their limits under chemically aggressive liquids or gases, glass tubing and profile glass tubing still easily hold up. The chemical resistance of glass includes water resistance, acid resistance and alkali resistance.
Water resistance as per ISO 719
Water-resistance in accordance with European and US Pharmacopoeia
Water-resistance is especially important for the manufacture of glass pharmaceutical primary packaging, since most medicines are preserved in a watery solution. In the international Pharmacopoeias PhEur and USP (Ph Eur = Pharmacopoea Europaea and USP = United States Pharmacopeia) the glass types used in manufacturing are split into water-resistance class Type I (highest resistance) to Type III. The glass-grain test described above is modified so that the container is reduced to a grain size of 425-300 μm and 10g of it are heated in purified water at a temperature of 121°C for 30 min (as per updated Ph Eur and USP). According to this glass-grain test, the neutral glass FIOLAX® clear is a 'Type 1 glass'.
The right glass types for technical applications are chosen depending on other necessary material properties such as fusing with other glass or material or temperature resistance.
You will find a summary of glass types with hydrolytic resistance in our Glass Tubing Explorer.
If you are not sure which type of glass is right for your application or whether what you want to do can be realized with glass, Ask our glass specialists!
Half loss in weight
after 6 h
|1||highly acid resistant||up to 0.7|
|2||acid resistant||above 0.7 up to 1.5|
|3||slight acid attack||above 1.5 up to 15|
|4||high acid attack||above 15|
Alkali resistance as per ISO 695
Loss in weight
after 3 h
|1||low alkali attack||up to 75|
|2||slight alkali attack||above 75 up to 175|
|3||high alkali attack||above 175|
When considering the overall results of the analyses of water resistance, acid resistance and alkali resistance, the glass types DURAN® , FIOLAX® clear, FIOLAX® amber, DUROBAX® clear and DUROBAX® amber provide very high chemical durability.
Would you like to search for specific features in our range of glass types? Then use our Glass Tubing Explorer.
Selection Filter "Properties" in Glass Tubing Explorer:
Selection „High chemical resistance“ and „High hydrolytic resistance“:
Do you need assistance in selecting a glass type? Ask our glass specialists!