GB/T 8293-2019 English PDFUS$199.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 8293-2019: Rubber latex, natural, concentrate - Determination of sludge content Status: Valid GB/T 8293: Historical versions
Basic dataStandard ID: GB/T 8293-2019 (GB/T8293-2019)Description (Translated English): Rubber latex, natural, concentrate - Determination of sludge content Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: B72 Classification of International Standard: 83.040.10 Word Count Estimation: 10,141 Date of Issue: 2019-06-04 Date of Implementation: 2020-05-01 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 8293-2019: Rubber latex, natural, concentrate - Determination of sludge content---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.Rubber latex, natural, concentrate--Determination of sludge content ICS 83.040.10 B72 National Standards of People's Republic of China Replace GB/T 8293-2008 Determination of the content of concentrated natural latex residues (ISO .2005.2014, MOD) Published on.2019-06-04 2020-05-01 implementation State market supervision and administration China National Standardization Administration issued ContentForeword III 1 Scope 1 2 Normative references 1 3 Principle 1 4 reagent 1 5 Instrument 1 6 sampling 1 7 Test step 2 8 results indicate 2 9 precision 2 10 Test report 2 Appendix A (informative) Precision 3 Reference 5ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 8293-2008 "Determination of the content of concentrated natural rubber latex residue", compared with GB/T 8293-2008, the main The technical changes are as follows. --- The scope of Chapter 1 adds "natural latex that does not necessarily apply to other sources; does not apply to latex or vulcanized latex"; --- Change the ISO /T R9272 in the normative reference in Chapter 2 to the reference (see References, No. 2 of the.2008 edition) chapter); --- Change "12000m/s2, equipped with two 50mL conical centrifuge tubes" to "12000m/s2 (1200g), equipped with two 50mL conical centrifuge tube or round centrifuge tube" (see 5.1,.2008 version 5.1); --- Change the "pipette" to "pipette or pipette" (see 5.2, 5.2 of the.2008 edition); --- Increased requirements for "oven" and "balance" (see 5.3, 5.4); --- "Dry at 70 °C ± 2 °C, until the weight loss is less than 1mg in 30min" to "more than 70 °C ± 5 °C temperature Dry until the mass is reduced by less than 1 mg" (see Chapter 7, Chapter 7 of the.2008 edition); --- Revised the representation method of the residue content calculation formula (see Chapter 8, Chapter 8 of the.2008 edition); --- Change the precision clause to informative Appendix A "Precision" and update the precision data (see Chapter 9 and Appendix) A, Chapter 9 of the.2008 edition). This standard uses the redrafting method to modify the ISO .2005.2014 "Determination of the content of concentrated natural rubber latex residue". The technical differences between this standard and ISO .2005.2014 and their reasons are as follows. --- Regarding the normative reference documents, this standard has made technical adjustments to adapt to the technical conditions of China. Adjustment The situation is reflected in Chapter 2, “Regulatory Citations”, and the specific adjustments are as follows. ● Replace ISO 123 with GB/T 8290 modified to international standards (see Chapter 6). --- Added "warning" to comply with the provisions of GB/T 20001.4-2015. --- Change the "pipette" to "pipette or pipette", because the pipette is also a common instrument (see 5.2, ISO .2005..2014 5.2). --- Increased requirements for "oven" and "balance" to better standardize test conditions (see 5.3, 5.4). --- Modified the residue formula calculation formula to meet the requirements of GB/T 1.1-2009 (see Chapter 8). --- Added "The test results are expressed as the average of the results of duplicate measurements" to facilitate the use of this standard (see Chapter 8). This standard was proposed by the China Petroleum and Chemical Industry Federation. This standard is under the jurisdiction of the National Rubber and Rubber Products Standardization Technical Committee (SAC/TC35). This standard was drafted. Agricultural Products Processing Institute of China Academy of Tropical Agricultural Sciences, Hainan Natural Rubber Quality Inspection Station, Guangdong Inspection Quarantine Technology Center, Hainan Natural Rubber Industry Group Co., Ltd. The main drafters of this standard. Li Yimin, Lu Guang, Lin Yunping, Liu Nengsheng, Luo Haizhen, Ji Jiajian. The previous versions of the standards replaced by this standard are. ---GB/T 8293-1987, GB/T 8293-2001, GB/T 8293-2008. Determination of the content of concentrated natural latex residues Caution - Personnel using this standard should have practical experience in formal laboratory work. This standard does not indicate all possible security questions. question. It is the responsibility of the user to take appropriate safety and health protection measures and to ensure compliance with the relevant national regulations.1 ScopeThis standard specifies the method for determining the content of concentrated natural latex residue. This standard applies to natural rubber latex from Brazilian trefoil trees and may not be suitable for natural latex from other sources. This standard does not apply to latex or vulcanized latex.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 8290 concentrated natural latex sampling (GB/T 8290-2008, ISO 123.2001, MOD)3 PrincipleThe sample was centrifuged, and the resulting residue was repeatedly washed with an ammonia-ethanol solution and then dried to a constant mass.4 reagentsUse only validated analytical reagents, distilled water or water of equivalent purity. 4.1 Ammonia-ethanol solution, the composition is as follows. ---Ammonia solution, ρ = (0.90 ± 0.02) g/mL 10mL ---Ethanol, the content is not less than 95% (volume fraction) 340mL ---Water 1000mL5 instrumentsLaboratory routine instruments and the following instruments. 5.1 centrifuge, producing an average acceleration of about 12000m/s2 (1200g), equipped with two 50mL conical centrifuge tubes or round Heart tube. 5.2 Pipette or straw, the capacity is appropriate, the diameter of the lower mouth is about 2mm. 5.3 The oven can control the temperature at 70 °C ± 5 °C. 5.4 Balance, accurate to 0.1mg.6 samplingSampling according to the method specified in GB/T 8290. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 8293-2019_English be delivered?Answer: Upon your order, we will start to translate GB/T 8293-2019_English as soon as possible, and keep you informed of the progress. 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Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.Question 5: Should I purchase the latest version GB/T 8293-2019?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 8293-2019 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |
