GB/T 41063-2021 English PDF (GBT41063-2021)

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GB/T 41063-2021: Textile glass -- Determination of density
GB/T 41063-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.100.10
CCS Q 36
Textile glass - Determination of density
ISSUED ON: DECEMBER 31, 2021
IMPLEMENTED ON: JULY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions... 4 
4 Humidity conditioning and test environment ... 5 
5 Test methods ... 5 
6 Test report ... 11 
Annex A (normative) Calibration of pycnometer sample chamber and additional
chamber volumes ... 12 
Textile glass - Determination of density
1 Scope
This document specifies the humidity conditioning and test environment, test method
and test report for determination of glass fiber density.
This document describes three test methods for determining the density of glass fibers,
namely:
- Method A: Gas pycnometer method;
- Method B: Liquid pycnometer method;
- Method C: Buoyancy method.
Method A is the arbitration test method.
This document applies to the determination of glass fiber density.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 6682, Water for analytical laboratory use - Specification and test methods
GB/T 9914.2, Test method for reinforcement products - Part 2: Determination of
combustible-matter content for glass fibre
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 density; ρ
The mass of a substance per unit volume at a specified temperature.
NOTE: Density is measured in kilograms per cubic meter (kg/m3), kilograms per liter (kg/L) or
grams per cubic centimeter (g/cm3).
5.1.2.2 Constant temperature water bath. The temperature of the sample chamber can
be maintained at 23°C ± 0.1°C.
5.1.2.3 Analytical balance. It is readable to 0.1mg. The maximum allowable error is
0.5mg. The measuring range is 200g.
5.1.2.4 Measuring gas. It is recommended to use helium with a purity of not less than
99.99%. Other non-corrosive and non-adsorbed gases can also be used, such as nitrogen
with a purity of not less than 99.99%.
5.1.2.5 Suitable tools, such as scissors or knife.
5.1.2.6 Vacuum pump (optional).
5.1.3 Specimen
Unless otherwise agreed, the specimen shall be free of wetting agent. To remove the
wetting agent, the burning method specified in GB/T 9914.2 can be used. If the
interested parties agree, the test specimen containing wetting agent can also be used.
Take a specimen of appropriate mass according to the volume of the sample chamber.
Cut the fibers with a suitable tool (5.1.2.5) to no higher than the height of the sample
chamber.
5.1.4 Operation
5.1.4.1 Check the gas specific gravity meter (5.1.2.1) to ensure that there is no gas
leakage in the instrument.
5.1.4.2 Weigh the mass (m1) of the sample chamber with the analytical balance (5.1.2.3),
accurate to 0.1mg. Put the fiber in the sample chamber. Fill to more than 60% of the
sample chamber capacity. Weigh the mass (m2) of the sample chamber and the specimen,
accurate to 0.1mg.
5.1.4.3 Put the weighed sample chamber and specimen into the gas specific gravity
meter. Seal the sample chamber. Adjust the constant temperature water bath (5.1.2.2) to
keep the temperature of the sample chamber at 23°C ± 0.1°C. Access with the gas
(5.1.2.4). Multiple pulse purges to remove air from instrument sample chamber and
additional chamber. The vacuum pump (5.1.2.6) can also be used to remove air from
the instrument sample chamber and additional chamber.
5.1.4.4 Open all valves. Fill the sample chamber and additional chamber with gas at
standard atmospheric pressure. The pressure sensor should now read zero.
5.1.4.5 Close the valve of the additional chamber. Fill the sample chamber with gas
until the desired pressure is reached. 1 standard atmosphere is recommended. Close the
intake valve. The pressure sensor reading is recorded as p1.
5.2.2.4 Distilled water, which shall comply with the provisions of GB/T 6682.
5.2.2.5 Pycnometer. The capacity is 50mL.
5.2.2.6 Analytical balance. It is readable to 0.1mg. The maximum allowable error is
0.5mg. The measuring range is 200g.
5.2.2.7 Ultrasonic cleaner with flat bath. The power is not less than 400W.
5.2.2.8 Electric furnace, laboratory use, commercially available.
5.2.2.9 Constant temperature water bath. The temperature control accuracy is ±0.1℃.
5.2.3 Specimens
Specimens should be free of wetting agent. To remove the wetting agent, the burning
method specified in GB/T 9914.2 can be used. Weigh 35g±2g of specimen. After
removing the wetting agent, use an agate mortar to grind it to a length of 1mm~3mm.
Transfer it to a beaker. Use 3 times the specimen volume of absolute ethanol (5.2.2.1)
to wash. Place still. Pour out the solvent. Repeat washing 2~3 times. Dry in the blast
drying oven (5.2.2.2) at a temperature of 105℃±2℃ for not less than 1h. Cool to room
temperature in the desiccator (5.2.2.3).
5.2.4 Operation
5.2.4.1 Use distilled water (5.2.2.4) to rinse the pycnometer (5.2.2.5). Dry to constant
weight together with the stopper at 105℃±2℃. Cool to room temperature in the
desiccator. Use the analytical balance (5.2.2.6) to weigh its mass (m), accurate to 0.1mg.
5.2.4.2 Put the 8g~10g of specimen in the pycnometer through the funnel. Wipe off the
powder stuck to the outside and mouth of the pycnometer. Weigh the mass (m1) of the
pycnometer and the specimen, accurate to 0.1mg.
5.2.4.3 Fill 3/4 pycnometer with distilled water. Eliminate air bubbles by cleaning with
the ultrasonic cleaner (5.2.2.7) or heating with the electric furnace (5.2.2.8). After
removing the bubbles, place the pycnometer in the constant temperature water bath
(5.2.2.9) at 23°C ± 0.1°C for at least 1h. Fill with 23℃±0.1℃ distilled water. Use a
stopper to plug. Set the volume to constant. Dry and weigh its mass (m2), accurate to
0.1mg.
5.2.4.4 Remove the specimen from the pycnometer. Filled with distilled water after de-
bubbling. Place in a constant temperature water bath at 23℃±0.1℃ for at least 1h. Take
out. Use 23℃±0.1℃ distilled water to set the volume tot constant. Dry and weigh its
mass (m3), accurate to 0.1mg.
5.2.4.5 The density of the specimen is calculated according to formula (2):
0.5mg. The measuring range is 200g.
5.3.2.8 Thermometer, with an accuracy of 0.1°C, capable of measuring the temperature
of water.
5.3.2.9 Beaker. Appropriate volume (250mL~750mL). It can be placed in the balance.
The gondola or wire loop specimen holder can be immersed in distilled water.
5.3.2.10 Support frame. Place the beaker across the balance tray.
5.3.2.11 Hanging basket, connected with the balance tray. The gondola is made of
degreased wire with a diameter of less than 0.2mm.
5.3.3 Specimens
Perform sampling during glass fiber production drawing. Use the nickel-plated crucible
tongs (5.3.2.1) to cut a section of glass rod directly from under the bushing. The mass
is 2g±1g. Place in the specimen dish (5.3.2.2) to cool naturally. Repeat the interception
to get multiple backups. Pick at least 5 glass rods that are free of visible bubbles, stones,
streaks and so on. Use the file (5.3.2.3) to trim both ...