GB/T 2481.2-2020 English PDFUS$559.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 2481.2-2020: Bonded abrasives - Determination and designation of grain size distribution - Part 2: Microgrits Status: Valid GB/T 2481.2: Historical versions
Basic dataStandard ID: GB/T 2481.2-2020 (GB/T2481.2-2020)Description (Translated English): Bonded abrasives - Determination and designation of grain size distribution - Part 2: Microgrits Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J43 Classification of International Standard: 25.100.70 Word Count Estimation: 30,374 Date of Issue: 2020-04-28 Date of Implementation: 2020-11-01 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 2481.2-2020: Bonded abrasives - Determination and designation of grain size distribution - Part 2: Microgrits---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Bonded abrasives--Determination and designation of grain size distribution--Part 2. Microgrits ICS 25.100.70 J43 National Standards of People's Republic of China Replace GB/T 2481.2-2009 Detection and marking of abrasive grain size composition for consolidated abrasives Part 2. Micronized Part 2. Microgrits (ISO 8486-2..2007, Bondedabrasives-Determinationanddesignationofgrainsize 2020-04-28 release 2020-11-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee ContentsForeword Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Particle size composition and particle size classification 1 4.1 Micro powder series 1 4.2 Particle size composition 1 4.3 Grain size classification 2 5 Detection of micro powder 4 5.1 General 4 5.2 Tolerance 4 5.3 Marking of detection methods 5 6 Detection method 5 6.1 X-ray gravity settling method 5 6.2 Resistance method 8 6.3 Settling tube method 10 7 Mark 20 8 Logo 20 Appendix A (informative appendix) The structural changes of this part compared with ISO 8486-2..2007 21 Appendix B (informative appendix) Recording table 23 for measuring the particle size of F series fine powder and J series fine powder with a settling tube particle size analyzer Appendix C (informative appendix) Example of data processing for detection of particle size composition of fused corundum 24ForewordGB/T 2481 "Inspection and Marking of Abrasive Particle Size Composition for Consolidated Abrasives" is divided into the following two parts. --- Part 1. Coarse abrasive particles F4 ~ F220; --- Part 2. Micronized powder. This part is Part 2 of GB/T 2481. This section was drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 2481.2-2009 "Determination and marking of the particle size composition of abrasives for consolidated abrasives Part 2. Fine powder" Compared with GB/T 2481.2-2009, except for editorial changes, the main technical changes are as follows. --- Modified the definition of micropowder (see Chapter 3, Chapter 3 of the.2009 edition); --- Modify the "photoelectrode settlement method" in the detection method to "X-ray gravity settlement method" (see 6.1, 6.2 of.2009 edition); --- Added the content of the particle size composition of the F series fine powder by the resistance method (see 6.2.7.1); --- Revised the relevant content of the settlement tube method test (see 6.3, 6.3 in.2009 edition). This section uses the redrafting method to modify the ISO 8486-2..2007 "Testing and marking of the abrasive particle size composition for consolidated abrasives. Part 2. Fine powder F230 ~ F2000 ". Compared with ISO 8486-2..2007, this part has more structural adjustments. Appendix A lists this part and ISO 8486-2..2007 The chapter number comparison table. The technical differences between this part and ISO 8486-2..2007 and the reasons are as follows. --- With regard to normative quotation documents, this part has been adjusted with technical differences to adapt to China's technical conditions and adjustments The situation is reflected in Chapter 2 "Regulatory Reference Documents", with specific adjustments as follows. ● Deleted ISO 8486-1; ● Added reference to GB/T 4676; ● Added reference to GB/T 16458; --- Modify the definition of micro powder to improve its content, and consistent with China's standard system; --- Added the content of J240 ~ J8000 fine powder for precision grinding to meet the actual production and application needs of China; --- Deleted the calculation content of 4.2 in ISO 8486-2..2007, because it only applies to the particle size series in Table 1, but not to Other particle size series; --- Deleted the principle content of the X-ray gravity sedimentation method detection in ISO 8486-2..2007, because the actual detection does not require interest Use it for calculations; --- Deleted Table 11, Table 12 and Table 13 in ISO 8486-2..2007, and added the detailed calculation formula of the parameter K value to Adapt to the actual situation of our country. The following editorial changes have been made in this section. --- Modified the standard name; --- Modified the expression of the scope; --- Deleted the informative Appendix A in ISO 8486-2..2007. This part is proposed by China Machinery Industry Federation. This part is under the jurisdiction of the National Abrasives Standardization Technical Committee (SAC/TC139). This section was drafted. Zhengzhou Abrasives Grinding Research Institute Co., Ltd., Zhuhai Truth Optical Instrument Co., Ltd., Zibo Jinjiyuan Research Abrasive Materials Co., Ltd., Pingdingshan Yicheng New Materials Co., Ltd. The main drafters of this section. Bao Hua, Zhang Liang, Zhang Fugen, Ding Jianping, Xia Jun, Wang Weitao, Su Yan, Ma Yafei. The previous versions of the standard replaced by this part are as follows. --- GB/T 2477-1983, GB/T 2481-1983; --- GB/T 2481.2-1998, GB/T 2481.2-2009. Detection and marking of abrasive grain size composition for consolidated abrasives Part 2. Micronized1 ScopeThis part of GB/T 2481 specifies the terms and definitions, particle size groups of corundum, silicon carbide fine powder F230 ~ F2000, J240 ~ J8000 Grain size classification, fine powder detection, detection methods, marks and signs. This section applies to the manufacture of consolidated abrasives and fine powders for general industrial use, fine powders for precision grinding, and fine powders recovered from consolidated abrasives, And loose powder for polishing.2 Normative referencesThe following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document. GB/T 4676 Ordinary abrasive sampling method (GB/T 4676-2018, ISO 9138..2015, MOD) GB/T 16458 Terminology of Abrasives3 Terms and definitionsThe terms and definitions defined in GB/T 16458 and the following apply to this document. 3.1 Micro powder When the particle size composition is checked by the sedimentation method or the resistance method, the median particle size ds50 (or dv50) is not greater than 64 μm.4 Particle size composition and particle size classification4.1 Micro powder series The fine powder specified in this part includes two series of F series fine powder for general industrial use and J series fine powder for precision grinding. The front is prefixed with the letters "F" and "J", respectively. 4.2 Particle size composition The particle size composition of F series fine powder and J series fine powder is determined according to the following criteria. a) The maximum particle size should not exceed the maximum allowable value of ds0 (or dv0); b) At the 3% point of the particle size composition curve, its particle size (theoretical particle size) should not exceed the maximum allowable value of ds3 (or dv3); c) At the 50% point of the particle size composition curve, the median particle size (theoretical particle size) should be within the allowed range of the specified ds50 (or dv50); d) At the 80%/75%, 94%/95% points of the particle size composition curve, the particle size (theoretical particle size) should reach ds80 (or dv75), ds94/95 (Or dv94) the minimum allowable value. These four criteria should be met at the same time. The specified values of each particle size number of F series micropowder are shown in Table 1 (applicable to X-ray gravity sedimentation method and resistance Method, corresponding to the values of 80% and 94%), Table 2 (applicable to the settlement tube method, corresponding to the values of 80% and 95%); the specified value of each particle size number of J series fine powder ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 2481.2-2020_English be delivered?Answer: Upon your order, we will start to translate GB/T 2481.2-2020_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 2481.2-2020_English with my colleagues?Answer: Yes. 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