Description

MATERIAL: LBG 3.3
Borosilicate glass 3.3 is a glass with a minimum silica content. It is virtually free of magnesium, lime, and zinc and contains only traces of heavy metals.
Chemical composition:
81% by weight of SiO2
13.0% by weight of B2O3
4% by weight of Na2O
Thermal properties:
Linear expansion coefficient: 32.5 x 10-7 °C
Maximum working temperature: 515 °C
Annealing point: 565 °C
Softening point: 820 °C
Specific heat: 0.2
Thermal conductivity (cal/cm3 / °C / sec): 0.0027
Chemical Resistance:
This glass is highly resistant to water, neutral and acidic solutions, concentrated acids and their mixtures, as well as chlorine, bromine, iodine, and organic solvents. Even during long periods of exposure and at temperatures above 100 °C, its chemical resistance exceeds that of most metals and other materials. It can withstand repeated dry and wet sterilizations without surface deterioration and subsequent contamination. It resists attack by various chemical substances. Only hydrofluoric acid, very hot phosphoric acid, and alkaline solutions with increasing concentration and temperature increasingly attack the glass surface.