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YBB 60372012: Tests for Stress
| Std ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status |
| YBB60372012 | English | 120 |
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Tests for Stress
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Standard similar to YBB 60372012
YBB601 | YBB604 | YB/T 6037 | YBB602 | YBB602 | YBB6:
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/YBB6
YBB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Test for stress
Test for stress
This method is suitable for the determination of stress in pharmaceutical glass containers.
Usually glass is an isotropic homogeneous material. When stress exists, it will show anisotropy
and produce light birefringence. This method stipulates a method, for measuring the
birefringence optical path difference, using a polarizing stress meter, AND for expressing the
stress of the product in terms of the optical path difference value per unit thickness.
Instrument
The polarizing stress meter shall meet the following technical requirements:
When using polarizing elements and protective components for observation, the brightness at
the edge of the light field shall not be less than 120 cd/m2.
The polarizing element used shall ensure that the polarization degree, at any point in the bright
field, is not less than 99%.
The polarization field is not less than 85 mm.
A 565 nm full-wave plate (sensitive color plate) and a quarter-wave plate can be placed,
between the polarizer and analyzer, respectively. The slow axis of the wave plate is 90° to the
plane of polarization of the polarizer.
The analyzer shall be installed, so that it can rotate relative to the polarizer and the full-wave
plate or quarter-wave plate; meanwhile it has a measuring device for the rotation angle (the dial
grid value is 1°).
Determination method
The test product shall be a product, that has not been tested after annealing. It must be placed
under temperature conditions in the laboratory for more than 30 minutes, in advance. Gloves
shall be worn during measurement, to avoid direct contact with the test product with hands.
(1) Inspection of colorless test samples
Inspection of the bottom of the colorless test sample: Place the quarter-wave plate into the field
of view. Adjust the zero point of the polarizing stress meter, to make it appear in a dark field of
view. Put the test product into the field of view. Observe the bottom from the mouth. At this
time, a dark cross will appear in the field of view. If the stress of the test product is small, the
dark cross will be blurred. Rotate the analyzer, to separate the dark cross into two arcs moving
in opposite directions. As the dark area moves outward, blue-gray appears on the concave side
of the arc, whilst brown appears on the convex side. If the stress value of a selected point is
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