This standard specifies a method for checking non-carbon black substances that cannot pass through a 850μm (20 mesh) sieve in various carbon blacks. This standard is applicable to the inspection of impurities contained in rubber carbon black, acetylene carbon black, pigment carbon black, etc. GB/T 3780.12-1995 Inspection of carbon black impurities GB/T3780.12-1995 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Carbon black—Inspection
of impurily material
Subject content and scope of application
GB/T 3780.121995
Replaces CB/T3780.1283
This standard specifies the inspection method for non-carbon black substances that cannot pass through 850um (20 mesh) sieve in various carbon fibers. This standard applies to the inspection of non-carbon black substances contained in rubber carbon black, acetylene carbon black, pigment carbon black, etc.: 2 Reference standards
GB 3778 Technical conditions for rubber agitation
Test black
GB 6003
HG/T 2725 Bulk carbon black crushing methodbZxz.net
3 Principle
Weigh a certain amount of carbon black + non-carbon black materials that do not exceed 850μm (20mm) sieve, such as sand, gravel, iron filings (rolled iron chips), etc. If there is any impurity,
4 Instruments and materials
4.1 Test sieve: standard aperture 8%0um (20mm), in accordance with B6003 regulations 4.2 Wool system: flat, wool length>2cm. 4.3 Bracket balance; fine grinding 2.
5 Sampling
5.1 Bag carbon black shall be carried out in accordance with Article 6.2 of GB 3778. 5.2 Bulk carbon black shall be prepared according to HG/F2725. 6.1 Weigh 530g carbon black sample with a tray balance, weigh 2g, and feed it into a 850um (20 mesh) sieve. 6.7 After use, gently brush the carbon black sample until all of it passes through the 850um (20 mesh) sieve. The carbon black sample that does not pass through the sieve (non-fluorescent carbon black retained on the sieve is the impurity) shall be recorded. 6.3 Pour out the impurities, observe with the naked eye, and use a press-down sign to identify the type of impurities (hard magnetism, sand, iron filings, etc.) 7.1 If more than 100% of the carbon black sample passes through the 850um (20 mesh) sieve, record the impurity "no". Approved by the State Administration of Technical Supervision on December 20, 1995 and implemented on August 1, 1996 GB/T 3780.12—1995
2 For those that fail to pass the 850μm (20 mesh) sieve, record the impurities as \ (specify what kind of impurities). 7.2
7.3 The inspection results shall be subject to the first inspection.
Test report
The test report shall include the following contents:
The national standard abbreviation number of the test basis,
The number and origin of the carbon sample;
Inspection results:
Record the abnormal phenomena that occurred during the test,
Test period.
Additional remarks:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Carbon Black Industry Research and Design Institute of the Ministry of Chemical Industry. This standard was drafted by the Carbon Black Industry Research and Design Institute of the Ministry of Chemical Industry, and the main drafter of this standard is Xia Lian!
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