At Cambridge Glassblowing we specialise in the two main types of glassware, Borosilicate Glass and Fused Quartz (Silica). Below we have some relevant technical data that will explain their unique properties. The information given here is only a brief summary, further technical information is available on request:
Borosilicate GlassBorosilicate glass is widely used for laboratory glassware, either mass produced or as custom made. Borosilicate glass has excellent thermal properties with its low coefficient of expansion and high softening point, it also offers a high level of resistance to attack from water, acids, salt solutions, organic solvents and halogens. Resistance to alkaline solutions is moderate and strong alkaline solutions cause rapid corrosion of the glass, as does Hydrofluoric acid and hot concentrated Phosphoric acid.
Fused Quartz (Silica)
Silica (SiO2) is one of the chief constituents of the earth’s crust. It is present in various forms, the most being quartz which is crystalline in character. Typical examples are siliceous sands and rock crystal. There are also various other crystalline forms such as tridymite and cristoblite. All types when fused at 2000°C give a vitreous material. Fused Silica Glass is a unique material with an unrivalled combination of purity, high temperature resistance, thermal shock resistance, good electrical insulation, optical transparency and chemical inertness. This material is widely used in the production processes of the semi-conductor industries.
The outstanding characteristic of silica glass is its very high degree of purity (99.99% SiO2).
It also has excellent thermal properties with an extremely low coefficient of expansion 0.55 x 106cm/cm°C (0-300°C). This makes the material particularly useful for optical flats 7 furnace windows, where its minimal sensitivity to thermal changes is of benefit. Another related property is its high resistance to thermal shock. Thin sections can be heated and cooled rapidly without cracking. Some technical references report, heating the material to 1100°C, then plunging into cold water with no adverse effects.
Please contact us if you require more detailed information such as transmission
curves or chemical impurity levels.