GB/T 3780.1-2015 English PDF (GBT3780.1-2015)

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GB/T 3780.1-2015: Carbon black -- Part 1: Test method for iodine adsorption number
GB/T 3780.1-2015
GB
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 83.040.20
G 49
Replacing GB/T 3780.1-2006
Carbon black –
Part 1. Test method for iodine absorption number
ISSUED ON. MAY 15, 2015
IMPLEMENTED ON. OCTOBER 01, 2015
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the PRC.
Table of contents
Foreword ... 3 
1 Scope ... 7 
2 Normative references ... 7 
3 Principles ... 8 
4 Reagent ... 8 
5 Instruments ... 9 
6 Sampling ... 9 
7 Test conditions ... 10 
8 Analysis procedures ... 10 
9 Result calculation ... 12 
10 Precision ... 13 
11 Test report ... 13 
Appendix A (Normative) Preparation, calibration and correction of solutions 14 
Appendix B (Informative) Determination of potassium iodide content ... 22 
Appendix C (Informative) Structural change comparison between this part and
ASTM D 1510-11 ... 24 
Foreword
GB/T 3780 “carbon black” is divided into the following parts.
- Part 1. Test methods for iodine absorption number;
- Part 2. Determination of oil absorption number;
- Part 4. Determination of oil absorption number of compressed sample;
- Part 5. Determination of specific surface area - CTAB test method;
- Part 6. Determination of tinting strength;
- Part 7. Determination of pH value;
- Part 8. Determination of heating loss;
- Part 10. Determination of ash;
- Part 12. Inspection of impurity material;
- Part 14. Determination of sulfur content;
- Part 15. Determination of light transmittance of toluene extract;
- Part 17. Indirect determination of particle size Reflectance method;
- Part 18. Standard test methods for evaluation in natural rubber (NR);
- Part 21. Determination of sieve residue for rubber compounding
ingredients - Water washing method
This part is part 1 of GB/T 3780.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 3780.1-2006 “Carbon black - Part 1. Test method for
iodine absorption number”. As compared with GB/T 3780.1-2006, the main
technical changes are as follows.
- MODIFY the “carbon black sampling amount” (SEE Table 1; Table 1 of
2006 version);
- ADD the “iodine solution, c (1/2 I2) = 0.4730 mol/L, SEE A.1.1 for the
preparation” (SEE 4.1);
- DELETE the mercury iodide (4.1 of 2006 version);
- ADD “Note 1” (SEE 4.2);
- ADD “Note 2” (SEE 4.2);
- DELETE the “Method B” from the “analysis procedure” in the prevision
version (8.3 of 2006 version);
- MODIFY the description of the “blank test” in the “analysis procedure”
[SEE 8.5c); 8.2.4.1.5 of 2006 version];
- DELETE the calculation equation from the “calculation results” of the “B
method” in the previous version (SEE 9.2 of 2006 version);
- ADD the “adjustment of sodium thiosulfate standard solution” and the
“adjustment of iodine solution concentration” (SEE A.2.1.1.3, A.2.2.1.3);
- ADD the “calibration with standard reference carbon black” and the
“standard reference carbon black INR iodine absorption number control
limit" (SEE A.3, A.4, Table A.1);
- DELETE the “SRB6 series standard reference carbon black iodine
absorption literature value” (Appendix C of 2006 version);
- ADD the “determination of potassium iodide content” (SEE Appendix B).
This part is, through the re-drafting method, compiled with reference to ASTM
D 1510-11 “Carbon black standard test method - iodine absorption number”.
As compared with ASTM D 1510-11, this part has many structural adjustments.
In Appendix C, it lists the clause comparison between this part and ASTM D
1510-11.
The technical differences between this part and ASTM D 1510-11 AND their
causes are as follows.
- MAKE reference to the Chinese national standard GB/T 3778, GB/T
3782, GB/T 15338 as corresponding to the D 4483, D 1799, D 1900, D
4821 which are referenced in ASTM D 1510-11; ADD GB/T 8170, GB/T
12805, GB/T 12806, and GB/T 12808, in order to facilitate Chinese
standard users (SEE Chapter 2);
- DELETE “meaning and application”, which is not preferable to be included
into the standard text (SEE Chapter 4 of ASTM D 1510-11);
- MODIFY “When replacing equipment or newly purchasing a large amount
of iodine or sodium thiosulfate, OR both cases occur, the regression
equation shall be redefined” into “When replacing equipment OR using
different batches of iodine or sodium thiosulfate OR the sodium thiosulfate
solution is stored for 30 d, it shall re-test the standard reference carbon
black to confirm the regression equation”, which is more comprehensive
and clear (SEE A.3.6; 8.6 of ASTM D 1510-11);
- ADD “Laboratory may choose other standard reference carbon blacks with
the same effect”, in order to improve operability (SEE A.3.2 note);
- ADD “Standard reference carbon black INR iodine absorption number
control limit” to facilitate standard users (SEE A.4, Table A.1);
- ADD “Structural changes of this part as compared with ASTM D 1510-11”
(SEE Appendix C).
This part was proposed by the China Petroleum and Chemical Industry
Association.
This part shall be under the jurisdiction of the Carbon Black Branch of National
Rubber and Rubber Products Standardization Committee (SAC/TC 35/SC 5).
The drafting organizations of this part. China Rubber Group Carbon Black
Industry Research and Design Institute, Ningbo Detai Chemical Co., Ltd.,
Jinneng Technology Co., Ltd., Qujing Zhongyi Fine Chemical Co., Ltd.,
Longxing Chemical Co., Ltd., Shandong Lianke New Materials Co., Ltd.,
Sichuan Institute of Technology.
The main drafters of this part. Nie Suqing, Liu Jian, Dai Chuanyin, Ma Weiwei,
Feng Jie, Jiang Liangqiang, Hou Hegang, Zhang Youwei, Jin Yongzhong.
This Standard replaces the standard previously issued as follows.
- GB/T 3780.1-1983, GB/T 3780.1-1991, GB/T 3780.1-1998, GB/T
3780.1-2006;
- GB/T 3781.7-1983, GB/T 3781.7-1993.
Carbon black –
Part 1. Test method for iodine absorption number
WARNING. Personnel using this standard shall have practical experience
in formal laboratory work. This part does not address all possible safety
issues. It is the responsibility of the user to take appropriate safety and
health measures and to ensure compliance with the conditions set forth
in the relevant national regulations.
1 Scope
This part of GB/T 3780 specifies the method for determining the iodine
absorption number of carbon black and acetylene black for rubber.
This part applies to all kinds of rubber carbon black (not including S series,
mixed gas and natural gas tank carbon black) and acetylene black. It is not
suitable for carbon black with surface porosity, volatility and the presence of
extract.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this Standard.
GB 3778 Carbon black for use in rubber products
GB/T 3782 Acetylene black
GB/T 8170 Rules for rounding off for numerical values and expression and
judgment of limiting values
GB/T 12805-2011 Laboratory glassware - Burettes
GB/T 12806-2011 Laboratory glassware - One-mark volumetric flasks
GB/T 12808-1991 Laboratory glassware - One mark pipettes
GB/T 15338 Carbon black - Validation of test met...