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YBB 00212003-2015: Test for coefficient of linear thermal expansion
YBB 00212003-2015
YBB
National Drugs Packing Containers (Materials) Standards
Test for coefficient of linear thermal expansion
ISSUED ON: AUGUST 11, 2015
IMPLEMENTED ON: DECEMBER 01, 2015
Issued by: China Food and Drug Administration of PRC
Test for coefficient of linear thermal expansion
This method is applicable to the determination of the linear thermal expansion coefficient
of medicinal glass containers with similar components to standard glass.
In this method, the standard glass with the known linear thermal expansion coefficient and
the glass with the linear thermal expansion coefficient to be tested are laminated and fired
together, drawn into thin filaments. Due to the different linear thermal expansion
coefficients of the two glasses, the filaments are bent. According to the degree of bending
of the filaments, the average linear thermal expansion coefficient of the glass to be tested
can be measured.
Device: Blowtorch, micrometer and micrometer holder (with an accuracy of 0.01 mm),
special clamps (as shown in Figure 1, the size is roughly made of steel strip which is 200
mm long, 20 mm wide, 1 mm thick. To prevent hands from hot, two pieces of insulation
are inserted for 100 mm at the front end), measurement ruler (as shown in Figure 2,
consisting each of a glass plate with a size of 250 mm x 300 mm and a glass mirror;
coordinate paper is pasted on the mirror surface and horizontal and vertical coordinate
lines are marked. Cut 3 mm paper around the two points which apart 200 mm laterally
and from both sides of the vertical line to expose the mirror surface; it is 60 mm for the
upper and lower parts of the cutting portion from both sides of the vertical line).
Measurement method: Take the non-defective glass under normal production and pull it
into a glass rod with a diameter of 4 ~ 6 mm. According to the measurement method of
average linear thermal expansion coefficient (YBB00202003-2015), accurately determine
the average linear thermal expansion coefficient as the standard glass.
Burn one end of the standard glass soft; use a special clip to flatten it; burn it soft again;
stretch it for 20 ~ 30 mm; burn it soft again; pull off the front tip, to form a shovel shape
which has a width of about 6 mm, a length of about 20 mm, a thickness of about 1 mm.
Take a small piece of sample to be tested; dip it on the glass rod; make it into a shovel
shape according to the above method. The two shovel shapes are required to have the
same width and thickness, without glass defects.
Overlap the two shovel shapes; burn them together; there shall be no air bubble; burn off
the rod tip with the tested product.