YBB 60092012 PDF in English
YBB 60092012 (YBB60092012) PDF English
Standards related to (historical): YBB 60092012
PDF Preview
YBB 60092012: PDF in English YBB 60092012
YBB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Tests for Resistance to Attack of Glass by Boiling
Hydrochloric Acid
Tests for Resistance to Attack of Glass by Boiling
Hydrochloric Acid
This method is suitable for the determination of resistance to attack of various types of
pharmaceutical glass containers and pipes by boiling hydrochloric acid.
According to the different principles and methods of observation, it is divided into gravimetric
method and flame emission or atomic absorption spectrometry.
Method One: gravimetric method
This method is to etch a glass sample of approximately 100 cm2 in boiling 6 mol/L ± 0.2 mol/L
hydrochloric acid solution for 6 hours. Determine the mass lost per unit surface area.
Preparation of test sample
Cut this product into glass tubes or pieces with regular geometric shapes and a total surface
area of 100 cm2 ± 10 cm2. The cross section is finely ground. Do not use fire for polishing. The
newly cut surface area shall not exceed approximately 10% of the total surface area. Wash with
water. Then rinse with absolute ethanol or acetone. Dry in oven at 150°C for 45 minutes.
Transfer to desiccator and cool for 45 minutes. Weigh accurately to ±0.1 mg. Record the mass
(m1). Prepare 2 test samples in the same way.
When measuring the acid resistance of glass materials, the influence of surface structure shall
be considered. The test sample must be pre-treated with mixed acid. Its operation is as follows:
Place a test sample in a plastic beaker. Add hydrofluoric acid (40%) – 2 mol/L hydrochloric
acid (1:9) mixed solution to completely submerge it. Stir with a magnetic stirrer for 10 minutes.
Use tweezers (the head is wrapped with plastic or platinum; treat it with dilute hydrochloric
acid before use; then wash it with water) to take out the test sample. Wash, dry, cool and weigh
as described above.
Determination method
In a wide-mouthed Erlenmeyer flask, add 800 ml of 6 mol/L ± 0.2 mol/L hydrochloric acid
solution. Heat to boil. Take the test sample and suspend it in the boiling acid with platinum wire
(the test sample shall be completely submerged and suspended in the center). Install a condenser
above the bottle mouth. After boiling evenly for 6 hours (see Figure 1), take out the test sample.
Use water to rinse it clean. Dry it for 45 in a 150°C oven. Transfer to desiccator and cool
for 45 minutes. Accurately weigh it to 0.1 mg. Record the mass (m2).
Calculate the average of the results obtained from the two test samples. If the error
between the two results and the average value is greater than 10%, two more test
samples must be taken and re-measured.
Grading is based on half of the mass loss in milligrams per square decimeter of the test
product. See Table 1:
Method Two: flame emission or atomic absorption spectrometry
This method is to etch a 30~40 cm2 test sample in a 100°C 6mol/L ± 0.2mol/L
hydrochloric acid solution for 3 hours. Determine the amount of alkaline oxide
precipitated per unit surface area.
Preparation of test sample
Cut this product into glass tubes or sheets with regular geometric shapes and a total
surface area of 30~40 cm2. Finely grind the cross-section. Wash with water. Finally
rinse with absolute ethanol or acetone. Dry in an oven at 115°C for 30 minutes. Prepare
three test samples in the same way.
When measuring the acid resistance of glass materials, the influence of surface structure
shall be considered. The test sample must be pretreated with mixed acid. The operation
is as follows: Put the test sample in a plastic beaker. Add hydrochloric acid (40%) -
2mol/L hydrochloric acid (1:9) mixed solution to completely submerge it. Stir with a
magnetic stirrer for 10 minutes. Use tweezers (the head is wrapped with plastic or
platinum; treat it with dilute hydrochloric acid before use; then wash it with water) to
take out the test sample. Wash and dry as described above.
Instruments
Flame photometer or atomic absorption spectrometer
Analytical balance: resolution is 0.1 mg
Determination method
Use tweezers to place the three washed test specimens into three polyethylene-covered
dishes. Cover and place in oven at 115°C. At the same time, put in three polyvinyl
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
|