Scientific & Industrial Glassware
BOROSILÂ®Â range of Laboratory Ware includes almost all items required in general lab usage. Our expertise in melting and forming low expansion, chemically inert borosilicate glass for over 50 years has made our products preferred globally. In fact, for a laboratory to get ISO 9001 certification in India, it is recommended that it use BOROSIL certified A-class glassware.
Our apparatus for measurement of volumes rank amongst the most accurate in the world.
Borosil Low Expansion Borosilicate Glass
From the 16 Century to today, chemical research teams have
used glass containers for a very basic reason : the glass
container is transparent, almost invisible. And so the contents
and the reaction are clearly visible.But because chemists must
heat, cool and mix chemical substances, ordinary glass is not
always adequate for laboratory work.
Laboratory work requires apparatus made in a glass which can
readily be moulded into any desired shape or form, which offers
maximum inertness when in contact with the widest range of
chemical substances, which can withstand thermal shock
without fracture and high temperature work without deforming,
and which will be resilient enough to survive the everyday
knocks to which it will be subjected in normal laboratory
handling, washing and sterilizing processes.
is the trade name of such a glass.
Items represent optimum mechanical, thermal and
chemical behaviour. This glass is used in laboratories as well
as for industrial applications where maximum thermal
resistance, thermal shock resistance, mechanical resistance
as well as unusual chemical resistance are required
glass is a low alkali borosilicate Type 3.3 glass. Its
typical chemical composition is given below. It is virtually free of
magnesia-lime-Zinc group and is completely free of arsenic
and other heavy material.
Approx % by weight
SiO 81 2
B O 13 2 3
Na O / K O 4 2 2
Al O 2 2 3
As the Coefficient of thermal expansion of glass is low,
the thermal stresses under a given temperature gradient are
consequently low and the glass can withstand higher
temperature gradients and also sudden temperature changes /
thermal shocks. Minute scratching of glass surface can
however reduce its thermal resistance.
In general â€śStrain Pointâ€ť should be regarded as the maximum
safe operating temperature of glassware. When
0 heated above 500 C the glass may acquire permanent
stresses on cooling
All labware is annealed in modern Lehr ovens under
strictly controlled conditions to ensure minimal residual stress
in the products.
The typical thermal properties of glassware are given
Coefficient of Linear Expansion 32.5 x10 / C
0 Strain Point 515 C
0 Annealing Point 565 C
0 Softening Point 820 C
Specific Heat 0.2
3 0 Thermal Conductivity (Cal / cm / C / sec) 0.0027
is highly resistant to water, neutral and acid solutions,
concentrated acids and their mixtures as well as to chlorine,
bromine, iodine and organic matters. Even during extended
0 period of reaction and at temperatures above 100 C, its
chemical resistance exceeds that of most metals and other
materials. It can withstand repeated dry and wet sterilization
without surface deterioration and subsequent contamination.
Resistance to attack of various chemicals is shown below.
Only hydrofluoric acid, very hot phosphoric acid and alkaline
solutions increasingly attack the glass surface with rising
concentration and temperature.
Contact chemical Duration Loss in Wt
2 In Hr mg / m
0 Water distilled at 100 C 6 10
0 Water Vapour Steam at 121 C 1 75
Acid HCI 6 100
0 80% H SO at 130 C 12 140 2 4
Alkali-1N soln. of Na CO boiling 6 4000 2 3
Infusion Fluids Isotonic
0 NaCI (0.85%) 121 C 2Â˝ 70
0 Glucose (5%) 121 C 2Â˝ 50
Fabricating With Borosil Glass
Due to low expansion of glass and easy workability, this glass
can be shaped, formed, joined into complicated apparatus. It
can be done even by an analyst in his own laboratory and keep
on changing till he gets what he needs. In case where
annealing in a controlled oven is difficult he can do so by flame
annealing which is also a great advantage.
Laboratory glassware made from glass show no
noticeable absorption in the visible region of the spectrum. It
appears consequently clear and colourless.