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Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 3780.21-2025: Carbon black - Part 21: Determination of sieve residue - Water washing method Status: Valid GB/T 3780.21: Historical versions
Basic dataStandard ID: GB/T 3780.21-2025 (GB/T3780.21-2025)Description (Translated English): Carbon black - Part 21: Determination of sieve residue - Water washing method Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: G49 Classification of International Standard: 83.040.20 Word Count Estimation: 14,198 Date of Issue: 2025-08-01 Date of Implementation: 2026-02-01 Older Standard (superseded by this standard): GB/T 3780.21-2016, GB/T 3781.5-2019 Issuing agency(ies): State Administration for Market Regulation, Standardization Administration of China GB/T 3780.21-2025: Carbon black - Part 21: Determination of sieve residue - Water washing method---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/GBT3780.21-2025ICS 83.040.20 CCSG49 National Standard of the People's Republic of China Replaces GB/T 3780.21-2016, GB/T 3781.5-2019 Carbon black - Part 21.Determination of sieve residue Water flushing method Water washing method Released on August 1, 2025 Implementation on February 1, 2026 State Administration for Market Regulation The National Standardization Administration issued PrefaceThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document is Part 21 of GB/T 3780 "Carbon Black". GB/T 3780 "Carbon Black" has been published in the following parts. --- Part 1.Test method for iodine adsorption value; --- Part 2.Determination of oil absorption; --- Part 4.Determination of oil absorption value of compression specimen; --- Part 5.Determination of specific surface area - CTAB method; --- Part 6.Determination of tinting strength; --- Part 7.Determination of pH value; --- Part 8.Determination of loss on heating; --- Part 10.Determination of ash content; --- Part 12.Inspection of impurities; --- Part 14.Determination of sulfur content; --- Part 15.Determination of light transmittance of toluene extract; --- Part 17.Indirect determination of particle size - reflectivity method; --- Part 18.Identification methods in natural rubber (NR); --- Part 21.Determination of sieve residue - Water rinse method; --- Part 22.Calculation of process capability index using process control data; --- Part 23.Sampling and identification of carbon black or other ambient particles; --- Part 24.Determination of void volume; --- Part 25.Determination of carbon content in carbon black; --- Part 26.Determination of carbon content in carbon black feed oil; --- Part 27.Determination of aggregate size distribution by disc centrifugal optical sedimentation measurement; --- Part 28.Determination of polycyclic aromatic hydrocarbons content; --- Part 29.Determination of solvent extractables; --- Part 30.Determination of high temperature volatiles by thermogravimetric method; --- Part 31.Determination of total hydrogen content. This document replaces GB/T 3780.21-2016 "Carbon black - Part 21.Rubber compounding ingredients - Determination of sieve residue - Water rinse method" and GB/T 3781.5-2019 "Acetylene black - Part 5.Determination of coarse particle fraction" has been revised compared to GB/T 3780.21-2016. Besides the editorial changes, the main technical changes are as follows. --- Changed "Scope" (see Chapter 1, Chapter 1 of the.2016 edition); --- Deleted the test sieve 125μm specification and added the test sieve 150μm specification [see 5.1a), 4.1a of the.2016 edition]; --- Added "rubber hose" [see 5.1f)]; --- Change “can be controlled at (125±5)℃” to “can be controlled at (125±2)℃” (see 5.5, 4.5 of the.2016 edition); --- Added "Acetylene black according to GB/T 3782" (see 6.1); --- Added "Acetylene black samples are tested as a single sample, and other samples are tested as double samples" (see 7.1); --- Change "correct the center of the nozzle and the test sieve to ensure that they are in the best position" to "adjust the nozzle to the center of the test sieve [5.1a)] Center” (see 7.2, 6.1 of the.2016 edition); --- Increased sample weight (see 7.5); --- Change "a small water flow is used to flush the periphery of the funnel" to "a small water flow is used to flush the inside of the funnel" (see 7.7, 6.6 of the.2016 edition); --- Change "rub to remove the carbon black remaining on the surface of the residue" to "rub the sample remaining on the surface of the residue, the residue should not be (See 7.11, 6.10 of the.2016 edition); --- Change “weighed” to “removed” (see 7.12, 6.11 of the.2016 edition). This document is modified to adopt ISO 1437.2017 “Rubber compounding ingredients — Determination of carbon black sieve residue”. Compared with ISO 1437.2017, this document has many structural adjustments. The comparison table of the structural number changes between the two documents is shown in Appendix A. The technical differences between this document and ISO 1437.2017 and their reasons are as follows. --- Added "conventional untreated various types of carbon black and powders for rubber products" and expanded its applicability according to the needs of my country's standards (see Chapter 1, Chapter 1 of ISO 1437.2017); --- Replaced ISO 565 (see 5.1) with the normative reference GB/T 6003.1, and added the normative references GB/T 3778, GB/T 3782, GB/T 7044, GB/T 8170 (see 6.1, 8.2), to facilitate users of Chinese standards; --- Deleted the test sieve 125 μm specification (see 5.1.1 of ISO 1437.2017) because it has been included in other specifications; --- Changed the oven controllable temperature (see 5.5) to be consistent with other standards of GB/T 3780; --- Added a dryer (see 5.6) to meet the test requirements; --- Added samples (see Chapter 6) to make the provisions more comprehensive and clear; --- Added the provision of parallel testing of samples (see 7.1) to facilitate users of the standard; --- Added specific steps for cleaning filters on water pipelines (see 7.3, 7.4) to facilitate users of the standard; --- Changed the sample weight (see 7.5) to expand applicability; --- Added the method for obtaining the test results (see 8.2) to ensure the standardization of the result values; --- Deleted the specific description of precision (see Chapter 8 of ISO 1437.2017) to simplify the statement of precision. The following editorial changes have been made to this document. --- To coordinate with the existing document, the name of the document was changed to Carbon black Part 21.Determination of sieve residue - Water rinse method. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Petroleum and Chemical Industry Federation. This document is under the jurisdiction of the National Technical Committee on Rubber and Rubber Products of Standardization (SAC/TC35). This document was drafted by. Zhonghao Heiyuan Chemical Research and Design Institute Co., Ltd., Sichuan University of Science and Chemical Technology, Anhui Jiatong Passenger Radial Tire Co., Ltd., Qujing Zhongyi Fine Chemical Co., Ltd., Jinneng Technology Co., Ltd., Shanxi Anlun Chemical Co., Ltd., Shanxi Shengda WEI TECHNOLOGY LIMITED. The main drafters of this document are. Sun Liping, Liu Jian, Lin Yi, Liu Lang, Hu Xiaoli, Zhang Hui, Xue Yalei, and Hu Chunlei. The previous versions of this document and the documents it replaces are as follows. ---First published in 1983 as GB/T 3780.21-1983, first revised in.1991, second revised in.2002, Third revision, fourth revision in.2016; --- This is the fifth revision, incorporating the contents of GB/T 3781.5-2019 (previous versions of GB/T 3781.5-2019 The publication status is. GB/T 3781.5-1993, GB/T 3781.5-2006).introductionCarbon black is a type of carbon element that exists in the form of nano-sized particles and amorphous carbon. It is formed by organic matter (natural gas, heavy oil, fuel oil, etc.) in the air. Carbon black is a product obtained by incomplete combustion or thermal decomposition under conditions of insufficient gas. Rice material, is listed as one of the 25 basic chemical products and fine chemical products in the international chemical industry. Carbon black is an indispensable It uses a small amount of reinforcing raw materials and can give rubber products a series of excellent properties. In the carbon black standardization system, the three major characteristic indicators of carbon black, namely, specific surface area, structure and surface activity, are the main indicators for determining the reinforcing capacity of carbon black. Indicators, focusing on the performance of carbon black, GB/T 3780 "Carbon Black" is intended to be divided into the following parts. --- Part 1.Test method for iodine absorption value. Applicable to test the surface area of carbon black. The surface area of carbon black will affect the absorption of carbon black in rubber. dispersion, especially related to tire wear resistance. --- Part 2.Determination of oil absorption value. Applicable to test the structure of carbon black. The structure is a unique property of carbon black. Carbon black with high structure can To provide better reinforcement for tires, the structures tested in this section are the primary and secondary structures of carbon black. It is the structure formed by the agglomeration of the smallest unit aggregates of carbon black. --- Part 4.Determination of oil absorption value of compression specimen. The oil absorption value of compression specimen of carbon black is used to test the primary structure of carbon black. The structural parameters of the smallest unit aggregate of carbon black, only the primary structure of carbon black can have a reinforcing effect on the tire. --- Part 5.Determination of specific surface area - CTAB method. Applicable to test the surface area of carbon black, which is the surface area of carbon black and rubber. The effective area that can produce cross-linking. --- Part 6.Determination of tinting strength. Applicable to testing the particle size distribution of carbon black, which can determine its effect on rubber. Reinforcement effect. Carbon black with high tinting strength value has a more concentrated particle size distribution, which can greatly improve the reinforcing effect of carbon black. --- Part 7.Determination of pH value. Applicable to testing the pH value of carbon black, which affects the vulcanization speed of rubber products. degree and vulcanization time. --- Part 8.Determination of heating loss. Applicable to the determination of low temperature volatiles such as moisture in carbon black. When the temperature is high, the rubber products will produce bubbles due to the vulcanization of low-temperature volatiles such as water at high temperatures, affecting the performance of rubber products such as tires. quality. --- Part 10.Determination of ash content. A high ash content in carbon black will affect the purity of carbon black and reduce the carbon content in carbon black. --- Part 12.Inspection of impurities. Impurities in carbon black are foreign matter introduced during the production process. They are large in size and are present in rubber products. If it exists, local cracks will easily appear at the location where it exists, which may cause a tire blowout. --- Part 14.Determination of sulfur content. Rubber products need to be vulcanized with sulfur. The high sulfur content of carbon black will affect the sulfur content of rubber products. Speed. --- Part 15.Determination of transmittance of toluene extract. The carbon black toluene extract involved in this part comes from hydrocarbons that are not completely pyrolyzed. The tar-like substance attached to the surface of carbon black can be extracted by some solvents such as toluene. Benzene dissolves and extracts low molecular weight volatiles on the surface of carbon black. The lower the transmittance of the toluene solution, the higher the content of low molecular weight volatiles in the carbon black. High, will affect the surface gloss of rubber products. --- Part 17.Indirect determination of particle size - reflectivity method. This part is an indirect test of the particle size of carbon black and is consistent with the electron microscope. The carbon black particle size measured by the mirror method corresponds to the carbon black particle size, which can quickly test the carbon black particle size and determine its effect on rubber products. --- Part 18.Identification method in natural rubber (NR). Applicable to testing the physical and mechanical properties of carbon black in rubber. The method is to mix carbon black with rubber, vulcanize it, and then test the physical and mechanical properties of the rubber after carbon black reinforcement according to GB/T 528. --- Part 21.Determination of sieve residue - Water flushing method. The sieve residue in carbon black is generated during the production process and its volume is greater than The substance with a diameter of 45μm is small in size. When it exists in rubber products, it will easily cause local cracks to appear, causing rubber The product breaks prematurely. --- Part 22.Calculation of process capability index using process control data. This part is applicable to the guidance of carbon black production process control. --- Part 23.Sampling and identification of carbon black or other environmental particles. This part specifies the sampling and identification of carbon black in the carbon black production environment. The sampling and identification of fugitive particles are suitable for testing the pollution of carbon black to the environment. --- Part 24.Determination of void volume. This part is the same as Part 4 and is a method for testing the primary structure of carbon black. This method can Quickly test the structure of carbon black. --- Part 25.Determination of carbon content in carbon black. This part is to place the combustion boat containing the weighed sample in a 1350 ° C tubular The combustion is complete in the furnace, and the carbon is oxidized into carbon dioxide. The carbon dioxide concentration is measured with a carbon analyzer to determine its carbon content. Together with Part 26, it constitutes the test method for carbon emissions from carbon black production process, which is used to formulate carbon emission control methods for carbon black production process. Prepare standards. --- Part 26.Determination of carbon content in carbon black feedstock oil. This part uses the same method as Part 25 to test carbon black feedstock. Carbon content in oil, together with Part 25, constitutes the test method for carbon emissions from carbon black production. Prepare for the implementation of carbon emission control standards. --- Part 27.Determination of aggregate size distribution by disk centrifugal optical sedimentation measurement. This part adopts the physical centrifugal method to measure Test the particle size distribution of carbon black, the same as Part 6, by testing the particle size distribution of carbon black to determine its reinforcing effect on rubber. --- Part 28.Determination of polycyclic aromatic hydrocarbons content. The source of polycyclic aromatic hydrocarbons in carbon black is the same as that in Part 15. Aromatic hydrocarbons are introduced into the environment as carbon black is used in various rubber and plastic products, especially in paints, inks, toys, etc. Carbon black with high PAH content can cause harm when it comes into contact with the human body. --- Part 29.Determination of solvent extractables. The source of solvent extractables in carbon black is the same as that in Part 15, toluene or acetone The size of the isosolvable extractable fraction reflects the residual organic polymers that remain on the carbon black surface during carbon black production and are not completely decomposed. The amount of extractables reflects the completeness of carbon black production conversion. A high content of extractables may contaminate the rubber compound and may cause It can cause pollution and the appearance of the product may also be problematic. --- Part 30.Determination of high temperature volatiles by thermogravimetric method. This part is the quantitative determination of high temperature volatiles of carbon black by thermogravimetric analyzer. The method of weight loss does not include the heating loss at 125℃ specified in GB/T 3780.8.It is suitable for the analysis of carbon black surface functional groups and adsorption Evaluation of the pyrolysis of adsorbents (e.g. hydrocarbons). --- Part 31.Determination of total hydrogen content. This part uses the thermal conductivity detector (TCD) method to determine the total hydrogen content in carbon black. Content, applicable to carbon black for rubber, related to the reinforcing performance of carbon black. The release of the above standards can improve the level of carbon black technology in my country, promote the improvement of carbon black product quality, and provide reference for the relevant users of carbon black. At the same time, it can be aligned with international standards, promote the effective use of standard functions, and better promote trade and exchange. flow and technical cooperation. Carbon black - Part 21.Determination of sieve residue - Water rinse method Warning. Personnel using this document should have practical experience in regular laboratory work. This document does not address all possible safety issues. The user is responsible for taking appropriate safety and health measures and ensuring that the conditions stipulated by relevant national laws and regulations are met.1 ScopeThis document describes a method for determining the sieve residue of untreated carbon black and powders for rubber products by washing with water. This document is applicable to the determination of sieve residues of carbon black, powder for rubber products, etc. It is not applicable to the sieve residues of carbon black and powder treated with oil. Determination.2 Normative referencesThe contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 3778 Carbon black for rubber GB/T 3782 Acetylene black GB/T 6003.1 Test sieves - Technical requirements and inspection - Part 1.Wire mesh test sieves (GB/T 6003.1- 2022, ISO 3310-1, MOD) GB/T 7044 Pigment carbon black GB/T 8170 Rules for rounding off values and expression and determination of limit values3 Terms and DefinitionsThere are no terms or definitions that require definition in this document.4 PrinciplesControl the water pressure to flush a sample of known mass through the test sieve, dry and weigh the mass of the residue remaining on the test sieve.5 Instruments and Equipment5.1 Washing Sieve Residue Determination Apparatus. Figure 1 is a schematic diagram of the main components of the instrument. The main components are divided into the following parts. a) Test sieves, made of phosphor bronze or stainless steel, with apertures of 45 μm, 150 μm, and 500 μm, in accordance with GB/T 6003.1 stipulates that other pore sizes of sieves may be used after consultation and agreement among the parties concerned. b) Funnel, at the bottom of which a test sieve can be installed. c) Nozzle, spraying clean water under controlled pressure to flush the specimen and pass it through the test sieve. d) Water pressure regulating device. e) Water filter. The wire mesh installed on the water supply line should have a mesh size no larger than the test sieve mesh size. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 3780.21-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 3780.21-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. 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