GB/T 3780.8-2019 PDF in English
GB/T 3780.8-2019 (GB/T3780.8-2019, GBT 3780.8-2019, GBT3780.8-2019)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| GB/T 3780.8-2019 | English | 140 |
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Carbon black -- Part 8: Determination of heating loss
| Valid |
| GB/T 3780.8-2008 | English | 519 |
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Carbon black -- Part 8: Determination of heating loss
| Obsolete |
| GB/T 3780.8-2002 | English | 239 |
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Carbon black -- Determination of heating loss
| Obsolete |
| GB/T 3780.8-1992 | English | 199 |
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Carbon black--Determination of loss heating
| Obsolete |
Standards related to (historical): GB/T 3780.8-2019
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GB/T 3780.8-2019: PDF in English (GBT 3780.8-2019) GB/T 3780.8-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.040.20
G 49
Replacing GB/T 3780.8-2008
Carbon black - Part 8: Determination of heating loss
(ISO 1126:2015, Rubber compounding ingredients – Carbon black - Determination of
loss on heating, MOD)
ISSUED ON: OCTOBER 18, 2019
IMPLEMENTED ON: SEPTEMBER 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Method A – Oven method ... 6
4 Method B – Moisture balance method ... 8
5 Method C – Infrared moisture meter method ... 10
6 Test report... 11
Appendix A (Informative) Structural changes of this Part compared with ISO
1126:2015 ... 13
Appendix B (Normative) Comparison between Method B and Method C ... 14
Carbon black - Part 8: Determination of heating loss
WARNING – Personnel who uses this Part shall have hands-on experience in
formal laboratory work. This Part does not address all possible security issues. It
is the responsibility of the user to take appropriate safety and health measures
and to ensure compliance with the conditions which are set by the relevant
national regulations.
1 Scope
This Part of the GB/T 3780 stipulates the determination of carbon black heating loss
by oven method (method A), moisture balance method (method B), and infrared
moisture meter method (method C), of which method A is the arbitration method.
This Part applies to carbon black for use in rubber products, acetylene carbon black
and colour carbon black, and also applies to the preparation of sample drying
conditions for carbon black prior to other tests.
Note: The loss of heating loss is mainly water, and may also be other traces of volatile
substances.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies to this document. For
undated references, the latest edition (including any amendment) applies to this
document.
GB/T 3778, Carbon black for use in rubber products
GB/T 3782, Acetylene black
GB/T 7044, Colour carbon black
GB/T 8170, Rules of rounding off for numerical values & expression and judgment
of limiting values
3 Method A – Oven method
3.1 Principle
Spread a certain amount of carbon black evenly on the bottom of the weighing bottle;
heat it in an oven at 125 °C for 1 h; then, place the weighing bottle in a desiccator to
cool to room temperature and weigh; calculate the heating loss.
3.2 Instruments and equipment
3.2.1 Oven, gravitational convection, temperature controlled at (125±1) °C,
temperature uniformity ≤ ±5 °C.
3.2.2 Weighing bottle, short, 30 mm in height, 60 mm in diameter, equipped with a
ground glass cover. When the test requires more samples, an open container shall be
used, and the sample thickness shall not exceed 10 mm during the heating process.
3.2.3 Analytical balance, resolution of 0.1 mg.
3.2.4 Desiccator, equipped with an effective desiccant.
3.3 Sample
3.3.1 Different types of carbon black shall be sampled according to the provisions of
GB/T 3778, GB/T 3782 or GB/T 7044, respectively.
3.3.2 The collected samples shall be placed in a closed sample container, and the
samples shall be brought to room temperature before the test.
3.4 Test steps
3.4.1 Perform two tests in parallel.
3.4.2 Put the weighing bottle and the cap in an oven at 125 °C; open the cap and dry
for 30 minutes. Then, move the weighing bottle and the cap into a desiccator and cool
to room temperature. Weigh the mass (m0) of the bottle and the cap, accurate to 0.1
mg.
3.4.3 Spread about 2 g of carbon black for use in rubber products or colour carbon
black (1 g of acetylene carbon black or powdered carbon black) evenly on the bottom
of the weighing bottle; cover and weigh (m1), accurate to 0.1 mg.
3.4.4 Put the sample weighed in 3.4.3 into the oven; uncover; dry at 125 °C for 1 h.
3.4.5 Cover the weighing bottle cap and transfer it to a desiccator; remove the cap and
cool to room temperature; cover the cap and re-weigh (m2), accurate to 0.1 mg. When
taking the weighing bottle out of the oven or desiccator, or during the transfer process,
the bottle cap shall be covered to avoid loss of carbon black due to air flow.
3.5 Test data processing
4.3 Sample
4.3.1 Different types of carbon black shall be sampled according to the provisions of
GB/T 3778, GB/T 3782 and GB/T 7044, respectively.
4.3.2 The collected samples shall be placed in a closed sample container, and the
samples shall be brought to room temperature before the test.
4.4 Test steps
4.4.1 Install the moisture balance according to the instrument manual, and set the
temperature to 125 °C. At the set temperature, dry the empty weighing plate for 30
min and cool to room temperature before proceeding to the sample determination.
4.4.2 Spread about 10 g of carbon black for use in rubber products or colour carbon
black (2 g of acetylene carbon black or powdered carbon black) evenly on the
weighing plate of the moisture balance, and weigh the mass (m3), accurate to 1 mg.
4.4.3 Gently close the upper cover of the moisture balance, and start the instrument to
start heating the sample.
4.4.4 Under this drying condition, after continuing to dry for a period of time, if the
mass change displayed on the moisture balance display within 30 s is less than 1 mg,
the sample has been dried, stop heating and record the mass value (m4) on the display.
4.5 Test data processing
4.5.1 The heating loss H of carbon black is expressed in mass fraction, and the value
is expressed in percentage (%), calculated by Formula (2):
Where:
m3 – the numerical value of sample mass before heating, in grams (g);
m4 – the numerical value of sample mass after heating, in grams (g).
4.5.2 Keep two decimal places for the calculation results; round off the value
according to the provisions of GB/T 8170.
4.5.3 The reading of the result can also be read according to the displayed value of the
instrument, and rounded off according to the provisions of GB/T 8170.
Figure 1 – Schematic diagram of infrared moisture meter
5.3 Sample
5.3.1 Different types of carbon black shall be sampled according to the provisions of
GB/T 3778, GB/T 3782 and GB/T 7044, respectively.
5.3.2 The collected samples shall be placed in a closed sample container, and the
samples shall be brought to room temperature before the test.
5.4 Test steps
5.4.1 Perform two tests in parallel.
5.4.2 Install the infrared moisture meter according to the instrument manual, and set
the temperature to 125 °C.
5.4.3 Spread about 10 g of carbon black for use in rubber products or colour carbon
black (2 g of acetylene black or powdered carbon black) evenly on the sample plate of
the infrared moisture meter, accurate to 1 mg.
5.4.4 Place the sample plate under the 185 W infrared lamp of the infrared moisture
meter, so that the distance between the upper edge of the sample plate and the center
of the lamp surface is 75 mm ± 2 mm.
5.4.5 Start the instrument and irradiate the sample with infrared rays.
5.4.6 When the value displayed on the digital display drops by ≤0.05% per minute,
irradiate for another 2 minutes, and the displayed value is the heating loss.
5.5 Test data processing
Express the heating loss of carbon black by the value displayed on the digital display,
take the average value, and round off the value according to the provisions of GB/T
8170.
5.6 Precision
The difference between the two determination results shall not exceed 11.71% of the
average value.
6 Test report
The test report shall at least give the following aspects:
a) identification and serial number of the sample;
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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