Borosilicate Glass Tube

Borosilicate Glass Tube

3.3 borosilicate glass is a type of glass with high heat resistance and low thermal expansion, containing boron trioxide. It offers excellent thermal shock resistance and chemical durability, commonly used for labware and heat-resistant glassware.

Physical and Chemical Properties:

Coefficient of mean linear themal expansion(20°C/300°C)	3.3±0.1(10–6K–1)
Softening point	820±10°C
Melting point	1260±20°C
Transformation temperature	525±15°C
Hydrolytic resistance at 98°C	ISO719-HGB1
Hydrolytic resistance at 121°C	ISO720-HGA1
Acid resistance class	ISO1776-1
Alkali resistance class	ISO695-A2

 

Main composition

SiO2	B2O3	Al2O3	Na2O+K2O
80±0.5%	13±0.2%	2.4±0.2%	4.3±0.2%