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PHYSICAL PROPERTIES

Typical composition and physical properties of our glass are listed in the table below:

Typical Composition Physical Properties
SiO2 ...............72.0% Working point ...........11500C
B2O3 ................9.0% Softening point ..........7650C
Al2O3 ................5.1% Annealing point ..........5500C
Na2O ................7.6% Strain point ...............5200C
K2O ..................1.9% Coefficient of expansion        
CaO ..................1.1% (300C-3000C) .............57x10-7
BaO ..................3.0% Density ..................2.43g/cc



PHARMACOPEIA & ARSENIC TESTS

BRITISH PHARMACOPEIA - PASSED
8.3 ml of 0.02 N HCL is added along with Methyl Red strong Sol. (20ml) in one liter solution.

UNITED STATES PHARMACOPEIA - PASSED
0.70 (0.65 for Amber glass)( 0.05 ml) 0.02 N H2SO4 / 10 g of powder glass.

ARSENIC TEST - PASSED
Detection limit tested against 0.1 ppm of Arsenic



USEFUL TECHNICAL TERMS


*Coefficient of Expansion : is the average increase in length per unit length per 0C change in temperature over the range of 300C to 3000C. Picture below further explains how this expansion occurs with temperature variation.



*Density (D): is the weight (W) per unit volume (V) and the values listed are reported in grams per cubic centimeter.

*Softening Point: is the temperature at which a glass fiber of uniform diameter elongates at a specific rate under its own weight. In this temperature range glass will deform noticeably under its own weight. Softening point temperature corresponds to a viscosity of 107.6 poises.

*Working Point: is the temperature at which the glass has a viscosity of 104 poises. At this temperature the glass is sufficiently soft to be worked.

*Annealing Point: is the temperature at which the internal stresses caused by rapid cooling or forming temperature may be substantially removed in a matter of minutes.

*Chemical Durability: is the resistance of a glass to chemical attack by its environment. It is expressed by the amount of alkali released.

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