Properties of Schott DURAN, SIMAX and Rasotherm glass

Chemical properties

The chemical resistance of Schott DURAN, SIMAX and KIMBLE\Rasotherm borosilicate glass is much higher than that of other materials, with a long exposure time and at temperatures above 100 °C. Its resistance to water, acids, salt solutions, organic compounds and highly alkaline solutions against halogens is adequate. On the other hand, hydrofluoric acid, fluoride solutions, heated phosphoric acids and strong alkalies attack the glass surface with increasing concentration and temperature. Borosilicate glass is made from selected raw materials using natural materials (quartz sand, salt, soda). Therefore, the glass does not contain impurities, heavy metals and substances that can be harmful to people and the environment.

Chemical composition: SiO₂ 81%, B₂O₃ 13%, Na₂O/K₂O 4%, Al₂O₃ 2%

Schott DURAN, SIMAX and KIMBLE meet the requirements of the following classes:

1. hydrolytic class, 1. acid class and 2. alkali class

Water resistance: ISO 719-HGB 1 (98 °C) ISO 720-HGA 1 (121 °C)	Acid resistance: Class 1 according to DIN 12112 DIN-ISO 1776	Alkali resistance: Class A2 according to DIN 52322 (ISO 695-A2)
The amount of Na2O released in mg for 1 g of glass grit as a function of time.	The depth of the attacked layer in μm as a function of the acid concentration (n).	The depth of the attacked layer in μm as a function of temperature.

Thermal properties

Schott DURAN, SIMAX and KIMBLE borosilicate glass has a very low coefficient of thermal expansion and tolerance to high temperature changes.
Its maximum permissible, short-term use temperature is 500 °C, its coefficient of linear thermal expansion (20/300 °C) is 3.3*10-6/K.

Optical properties

Schott DURAN, SIMAX and KIMBLE glass appears clear and colorless because it shows no significant absorption in the visible spectrum. With a larger layer thickness, it looks greenish. When working with light-sensitive materials, the surface of the glass can be colored brown. In this case, strong absorption occurs in the short-wave range (absorption peak at approx. 500 nm). In the range of 310–2200 nm, the absorption of borosilicate glass is negligible.