Composition : A borosilicate glass is used in Laboratories due to its excellent chemical, physical properties & having no elements of alkaline earth group and free from arsenic, antimony and heavy metals.

Stability : Highly resistant to water and all acids with the exceptions of hydrofluoric acid and hot glacial phosphoric. However, being predominantly a silicate, the glass is attacked by caustic alkali to a measurable extent.

Thermal Shock Resistant : The glass can withstand a high degree of thermal shock, due to low coefficient of thermal expension 33 x 10-7/°C between 0 - 300 °C.

Thermal Conductivity : 0.0027 cal/cm³/°C/Sec.

Physical Properties :
The maximum permissible operating temperature for Borosilicate glass is 500 deg. C. Above a temperature of 525 deg. C. The glass begins to pass from the solid to the viscous state. It has a very low linear coefficient of expansion, hence its highly thermal shock resistant.