GB/T 7048-2012 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 7048-2012 | English | 95 |
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Colour carbon black -- Determination of blackness
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| GB/T 7048-2003 | English | 239 |
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Colour carbon black -- Determination of blackness
| Obsolete |
| GB/T 7048-1993 | English | 279 |
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Colour black-Determination of blackness
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GB/T 7048-2012: Colour carbon black -- Determination of blackness---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/GBT7048-2012
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.040.30
G 49
Replacing GB/T 7048-2003
Colour carbon black - Determination of blackness
ISSUED ON: JUNE 29, 2012
IMPLEMENTED ON: DECEMBER 01, 2012
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Principle ... 5
4 Reagents ... 5
5 Instruments ... 6
6 Sampling ... 7
7 Test conditions ... 7
8 Test steps ... 7
9 Calculation of results ... 8
10 Precision ... 8
11 Test report ... 8
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 7048-2003 "Colour carbon black -- Determination of
blackness".
Compared with GB/T 7048-2003, the main changes of this Standard are as follows:
- Added GB/T 3780.8 (Chapter 2 of this Edition);
- Deleted "GSB 05-1427-2001" (Chapter 2 of GB/T 7048-2003);
- Deleted "GSB 05-1427-2001" and added "GB/T 9578" (2 and 4.3 of GB/T 7048-
2003; Chapter 2 and 4.3 of this Edition);
- Appropriately modified "Principle" (Chapter 3 of GB/T 7048-2003; Chapter 3 of
this Edition);
- Modified sample drying temperature from 105℃ to 125℃ (5.4 of GB/T 7048-2003;
5.4 of this Edition);
- Deleted the provision on syringe volume, and only its accuracy was specified (5.5
of GB/T 7048-2003; 5.5 of this Edition);
- Added "dryer" (5.6 of this Edition);
- Added "tough, conical" to "ink knife" (5.6 of GB/T 7048-2003; 5.7 of this Edition);
- Deleted "Figure 1" of GB/T 7048-2003, and added Figure 1 of this Edition;
- Deleted the provisions on the size of glass plates (5.7 of GB/T 7048-2003; 5.9 of
this Edition);
- Changed "ink film-making device" to "ink film-making device, groove depth (0.07
~0.10) mm, capable of preparing a film with uniform thickness (see Figure 1)"
(5.9.2.1 of GB/T 7048-2003; 5.8 of this Edition) ;
- Deleted the "glass slide film preparation method" and related instruments and
analysis steps h. At the same time, changed the numbering and content of the
analysis steps accordingly (5.9, 8.8, 8.8.2, 8.9.2 of GB/T 7048-2003; Chapter 8
of this Edition);
- Edited the provisions on drying of the sample in "Sampling" of the previous edition
into the steps of this Edition, and made appropriate modifications. At the same
time, added notes (6.2 of GB/T 7048-2003; 8.1.1 of this Edition);
- Added "Place the ink slurry on one end of a smooth and clean glass plate (5.9) for
Colour carbon black - Determination of blackness
WARNING -- Personnel using this standard shall have practical experience in
regular laboratory work. This standard does not point out all possible safety issues.
Users are responsible for taking appropriate safety and health measures and
ensuring that the conditions specified in relevant national laws and regulations are
met.
1 Scope
This Standard specifies the method for measuring the blackness of colour carbon black
using a reflectometer based on standard reference carbon black No. 3 (SRB3).
This Standard is applicable to all types of colour carbon black.
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 3780.8, Carbon black -- Part 8: Determination of heating loss
GB/T 7044, Colour carbon black
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 9578, Standard reference black 3 (SRB 3#)
3 Principle
The colour carbon black specimen (hereinafter referred to as the specimen) and the
standard reference carbon black 3# (hereinafter referred to as the standard specimen)
are mixed with refined 4# linseed oil. After grinding, a uniform ink slurry is obtained.
Then it is coated into a film of uniform thickness. The blackness value is measured by
a reflectometer. The blackness value of the sample is expressed by reflectivity.
4 Reagents
4.1 95% ethanol: chemically pure.
6 Sampling
Sampling shall be carried out in accordance with the provisions of GB/T 7044.
7 Test conditions
Room temperature of (23±2)℃, relative humidity of (50±5)%; or room temperature of
(27±2)℃, relative humidity of (65±5)%.
8 Test steps
8.1 Preparation of ink slurry (prepare double ink slurry)
8.1.1 Dry an appropriate amount of carbon black specimen and standard specimen (4.3)
according to the provisions of GB/T 3780.8. Place them in a desiccator (5.6) to cool to
room temperature.
NOTE: Carbon black shall not be re-dried.
8.1.2 Weigh (0.4±0.000 1) g of the dried test specimen and standard specimen (8.1.1)
respectively.
8.1.3 Place a weighed portion of carbon black in the center of the lower plate of the mill
(5.2).
8.1.4 Use a syringe (5.5) to draw 2.0 mL of refined linseed oil 4# (4.2). Add it to the
carbon black on the lower plate. Use an ink knife to mix the carbon black and refined
linseed oil 4# thoroughly. Apply a round cake in the center. Clean the ink sticking to
the ink knife as much as possible onto the plate of the grinder. Minimize the loss of ink.
8.1.5 Close the upper plate of the grinder and start grinding at a pressure of 0.017 MPa
for 50 r.
8.1.6 Open the upper plate. Use the ink knife to transfer the ink slurry adhering to the
upper plate to the lower plate as much as possible. Then, as the lower plate rotates, use
the ink knife to collect all the ink slurry at the center of the lower plate. Clean the ink
slurry adhering to the ink knife as much as possible onto the plate of the grinder. Close
the upper plate. Continue grinding for 50 r. Repeat this operation 3 times. Grind the ink
slurry for a total of 200 r.
8.1.7 Collect the ink on sulphuric acid paper or glass paper (4.5) or place it on one end
of a smooth and clean glass plate (5.9) for later use.
8.1.8 Clean the grinding machine plate with a solvent (e.g., ethanol) (4.1) and cotton
wool or soft tissue paper (4.4).
8.2 Preparation of ink film
8.2.1 Use the ink applicator (5.8) to scrape the ink from one end of the glass plate to the
other end within 2 s~3 s with appropriate and stable pressure to form an ink film.
8.2.2 The width of the ink film is about 50 mm. The surface shall be uniform, flat and
opaque. Otherwise, collect the ink with an ink knife and repeat the steps in 8.2.1 until
a satisfactory ink film is obtained.
8.3 Determination of ink reflectivity
8.3.1 Adjust the reflectometer to "0" according to the instrument manual.
8.3.2 Place the standard ink film carrier under the reflectance head. Align the light hole
of the reflectometer with the surface of the ink film (the part 20 mm away from the two
ends of the ink film is not considered). Turn the instrument calibration knob. Set the
reflectivity to 50 (scale). Measure the reflectivity of four different parts. Read the
readings after the instrument stabilizes (15~20) s. If the four readings are all between
49.5~50.5, it is considered to meet the requirements, otherwise prepare a new standard
ink film. At the same time, measure the reflectivity of another standard ink film.
8.3.3 Place the sample ink film carrier under the reflectivity head. Align the light hole
of the reflectometer with the surface of the ink film (the area 20 mm away from both
ends of the ink film is not considered). Measure the reflectivity of the ink at 4 different
locations. After the instrument stabilizes (15~20) s, record each reading and take the
average value.
9 Calculation of results
The blackness of the specimen is expressed as reflectivity. The result has one more
significant digit than that specified in GB/T 7044. The numerical value is rounded off
according to GB/T 8170.
10 Precision
Repeatability: The difference between two test results shall not exceed 2.0.
11 Test report
The test report shall include the following:
a) Name and identification of the specimen;
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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