Materials & making · Established
Glass designed for laboratory service
Boron-containing oxide chemistry helps laboratory glass tolerate heat changes and resist many chemical environments.
THE MATERIAL THAT DOES THE WORK
Chemical form
Laboratory borosilicate glass is an glass rich in silica, with boron oxide and smaller amounts of other oxides. The widely used 3.3-expansion grade contains sodium and aluminum oxides too. These are constituents of the glass, not loose elemental ingredients.
- 01
Formulate an oxide glass
A controlled mixture of silica, boron-containing material and other constituents sets the intended glass composition.
- 02
Melt and shape
Controlled melting and forming create stock or finished articles; additional operations can join, bend or finish glass components.
- 03
Contain and observe
The article provides a transparent barrier in its specified environment, with chemical compatibility and thermal limits remaining part of its use.
Glass Melting and Hot FormingTechnical Details of DURAN glass tubing
How the application developed
Otto Schott began developing glass for technical uses in 1887, using boric acid in the work that produced borosilicate glass. SCHOTT’s chronology records technical thermometers from 1891, laboratory glassware from 1893 and lamp cylinders from 1895. Pharmaceutical tubing followed in 1911 under the FIOLAX name. The sequence traces a glass family moving through measurement, laboratory work, lighting and medicine as manufacturers found uses for its thermal and chemical behavior.
Innovation History: borosilicate glass for technical applications
Why it works
Low thermal expansion helps reduce stresses when temperature changes. High resistance to water and many acids makes the glass useful for containers and laboratory apparatus. Transparency adds another practical advantage: contents and liquid levels remain visible through the wall.
How it is made & used
Glass producers control the batch composition, melt quality and hot-forming process. Tubes, rods and containers can follow different forming routes. Further processing can bend or join tubing and finish surfaces, giving the same glass family many useful laboratory geometries.
Glass Melting and Hot FormingTechnical Details of DURAN glass tubing
Inside the application
A laboratory vessel brings several requirements together. It must contain a chemical without rapidly contaminating it, permit observation and tolerate its specified thermal conditions. Borosilicate’s value comes from this combination of properties, rather than from heat resistance alone.
Limits & alternatives
Chemical resistance has exceptions. Hydrofluoric acid, hot concentrated phosphoric acid and strong alkaline solutions can attack borosilicate glass. Thermal-shock resistance also is not immunity: temperature gradients and the particular article’s geometry still matter during heating or cooling.
Part of a larger system
Borosilicate grades differ in composition and expansion, so the family name is not a complete specification. Related glasses serve packaging, diagnostic and industrial roles, with the choice guided by chemical exposure, optical needs and the intended thermal conditions.
Glass Types & PropertiesTechnical Details of DURAN glass tubing
FOLLOW THE EXPLANATION
See the science
Two different glass strategies ↗
Compare borosilicate’s bulk composition and thermal behavior with a different glass strategy: ion exchange at an aluminosilicate cover surface.
What this connection can show
The cover-glass schematic is sodium aluminosilicate, not laboratory borosilicate. Its surface layer is not a measured stress map or a claim that all glasses share the same strengthening treatment.
Sources & further reading
- Glass Types & Properties ↗DWK Life SciencesTechnical documentation · Source checked
- Glass Melting and Hot Forming ↗SCHOTTTechnical documentation · Source checked
- Technical Details of DURAN glass tubing ↗SCHOTTTechnical documentation · Source checked
- Innovation History: borosilicate glass for technical applications ↗SCHOTTHistorical account · Source checked
Sources and further reading. What the review labels mean