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CTECH Glassware Technical Information

All our heating apparatus such as beakers, conical flasks, crystallizing dishes, round bottom flasks and adapters listed in our product range are manufactured from borosilicate glass. A large proportion of our measuring equipment is also made from borosilicate glass. Borosilicate glass is internationally recognized as the premium raw material for laboratory grade glassware selected due to its physical and chemical characteristics as described below:

Technical data of CTECH® Glassware:

1. Composition

CTECH Glassware

SiO280.4%
AI2O32.4%
B2O313.0%
Na2O4.2%

2. Physical Properties

Glass type: Hard Borosilicate Glass Linear.

Coefficient of expansion (20oC - 300oC)3.3x10-6K
Annealing point560±10oC
Density, Annealed2.23g/cm3
Softening point820±10oC
Hydrolytic resistanceType 1 glass
Acid resistanceType 1 glass
Alkali resistanceType 1 glass

3. Temperature Resistance

Thermal resistance is a good gauge to how well the glass handles high heat and yet retains its shape and structural integrity. Factors that should be specially considered are softening temperature and coefficient of heat. Our borosilicate glass has high softening temperatures and low coefficient of heat enabling our glassware to withstand heat and also have a higher range of working temperatures. Special care must still be taken at temperatures above 1400oC to heating and cooling to be done in a most uniform manner.

4. Chemical Resistance

Borosilicate glass has a very high resistance to attack from water, acids, salt solutions, halogens and organic solvents. Only concentrated phosphoric acid and strong alkaline solution cause significant corrosion of the glass.

Chemical Resistance to effect of:

ConditionsStandardClass
Water at 98ISO 719HGB1
Water at 121ISO 720HGA1
AcidISO 1776HGA1
Boiling water solution of alkaliISO 695HGA2


6. Acid resistance

Our borosilicate glass has been shown to have high acid resistance due to the high silica content, meeting the requirement of being type 1 glass.

7. Pressure resistance

Glass being a brittle material is easily damaged by compressive or expansive forces. The presence of faults or imperfections during the glassblowing process would produce weak points in the glass for cracks to initiate. Our products for pressure or vaccum use have additional safety factor considerations in addition to the stated condition.

8. Optical Data

Our borosilicate glass allows light transmission in the visible spectrum to nearing UV spectrum. It is suitable for most general laboratory use.