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YBB60112012: Tests for Hydrolytic Resistance of Glass Grains at 98 Degree C
YBB 60112012
YBB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Tests for Hydrolytic Resistance of Glass Grains at 98°C
Tests for Hydrolytic Resistance of Glass Grains at 98°C
This method is applicable to the determination and grading of hydrolytic resistance of various
types of medicinal glass.
This method is a material testing method. Soak 2 g of glass particles with a particle size of
300~500 μm in 98°C test water for 60 minutes. The extent to which glass particles are etched
by water is measured and graded by titrating the etching solution.
Reagent: test water
The test water shall be boiled in an aged flask for more than 15 minutes to remove dissolved
gases such as carbon dioxide. Test water can be stored in stoppered flasks. The pH shall not
change within 24 hours.
Instruments
Water bath: constant temperature control is possible.
Volumetric flask: 50 ml, with glass stopper. Volumetric flasks and glass stoppers must be made
of borosilicate glass with an average linear thermal expansion coefficient of approximately
3.3×10-6K-1. The new volumetric flask must undergo aging treatment, that is, add an appropriate
amount of water to the volumetric flask and process it repeatedly according to the heating
conditions specified in the test steps until the water becomes neutral to methyl red.
Erlenmeyer flask: 100 ml and 250 ml. The material requirements for flasks and the handling
methods for new bottles are the same as for volumetric flasks.
Hammer, mortar and pestle made of hardened steel (see figure).
A set of stainless-steel standard sieves (including sieve A: pore diameter is 500 μm; sieve B:
pore diameter is 300 μm; sieve O: pore diameter is 600~1000 μm).