YBB 002020032015 (YBB002020032015)
Standard ID  Contents [version]  USD  STEP2  [PDF] delivered in  Name of Chinese Standard  See Detail  Status  Related Standard 
YBB 002020032015  English  135 
Add to Cart

010 minutes. Autodelivery.

Test for Coefficient of Mean Linear Thermal Expansion

YBB 002020032015
 Valid 
YBB 002020032015

YBB 002020032015: PDF in English YBB 002020032015
YY / YBB
National Drug Packing Container (Material) Standard
Test for coefficient of mean linear thermal expansion
ISSUED ON. AUGUST 11, 2015
IMPLEMENTED ON. DECEMBER 01, 2015
Issued by. China Food and Drug Administration of PRC
3. No action is required  Fullcopy of this standard will be automatically &
immediately delivered to your EMAIL address in 0~60 minutes.
Test for coefficient of mean linear thermal expansion
This method specifies the method of determining the average linear thermal expansion
coefficient of elastomeric glass far below the transition temperature.
This method is applicable to the determination of the average linear thermal expansion
coefficient of medical glasses of different materials.
Definition
(1) Average linear thermal expansion coefficient α (t0; t)
It refers to, in a certain temperature interval, the ratio of the length change of the test
product and the temperature interval and test product initial length, which is expressed
by the formula (1).
Where
t0 is the initial temperature or reference temperature, °C;
t is the actual temperature of the test product, °C;
L0 is the length of the glass test product at the temperature t0 during the test, mm;
L is the length of the test product at the temperature t, mm.
This method specifies that the nominal reference temperature t0 is 20 °C, so the mean
linear thermal expansion coefficient is expressed as α (20 °C; t).
(2) Transition temperature tg
It refers to the temperature when the glass has a dynamic viscosity of 1012.3 Pa • s, which
represents the transition of the glass from the brittle state to the viscous state, AND it
corresponds to the temperature at the intersection of the tangent line of the high
temperature portion and that of the low temperature portion of the thermal expansion
curve.
Instrumentation
(1) Device used to measure the length of the test product, in the accuracy of 0.1%.
(2) Push rod expansion instrument (horizontal or vertical), which can measure the length
change of the test product of 2x105L0 (i.e. 2 μm / 100 mm).
The contact force of the length gauge shall not exceed 1.0 N. This force acts through the
contact between the plane and the sphere, AND the radius of curvature of the sphere
...... (Above excerpt was released on 20170902, modified on 20210607, translated/reviewed by: Wayne Zheng et al.) Source: https://www.chinesestandard.net/PDF.aspx/YBB002020032015
