GB/T 1931-2009 English PDFUS$279.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 1931-2009: Method for determination of the moisture content of wood Status: Obsolete GB/T 1931: Historical versions
Basic dataStandard ID: GB/T 1931-2009 (GB/T1931-2009)Description (Translated English): Method for determination of the moisture content of wood Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: B60 Classification of International Standard: 79.020 Word Count Estimation: 6,625 Date of Issue: 2009-02-23 Date of Implementation: 2009-08-01 Older Standard (superseded by this standard): GB/T 1931-1991 Adopted Standard: ISO 3130-1975, MOD Regulation (derived from): National Standard Approval Announcement 2009 No.3 (Total No.143) Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China Summary: This standard specifies the determination of the moisture content of the wood test equipment, specimens, test procedures and results of calculations. This standard applies to the determination of physical and mechanical testing of wood when the moisture content. GB/T 1931-2009: Method for determination of the moisture content of wood---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.Method for determination of the moistrure content of wood ICS 79.020 B60 National Standards of People's Republic of China Replacing GB/T 1931-1991 Methods for determination of moisture content of wood (ISO 3130. 1975, Wood-Determinationofmoisturecontentforphysical andmechanicaltests, MOD) Posted 2009-02-23 2009-08-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released ForewordThis revised standard adopts the International Standard ISO 3130. 1975 "Determination of physical and mechanical tests of moisture content." This standard and ISO 3130. 1975 main technical differences compared to. --- The moisture content of a sample size of 20mm × 20mm × 25mm amended as 20mm × 20mm × 20mm. This standard replaces GB/T 1931-1991 "Method for determination of moisture content of wood." This standard compared with GB/T 1931-1991, the main changes are as follows. --- Modify the drying process, the values of the last two samples weighing the difference will not exceed 0.002g to not exceed the quality of the sample 0.5%; --- Appendix A and Appendix B of some description has been amended accordingly. The Standard Annexes A and B are normative appendix. This standard was proposed by the State Forestry Administration. This standard by the National Standardization Technical Committee timber. This standard is drafted by. China Forestry Science Institute of Wood Industry. Participated in the drafting of this standard. Northeast Forestry University. The main drafters of this standard. Zhaorong Jun, Fei Hua present, Lv Jianxiong, Yuhua Jiang, Huang Rongfeng, Zhao ke, Huang Anmin, Cui Yongzhi. This standard was first published in 1980, the first revision in 1991, this is the second revision. This standard by the National Standardization Technical Committee responsible for the interpretation of wood. Methods for determination of moisture content of wood1 ScopeThis standard specifies the determination of wood moisture content test equipment, samples, test procedures and results of calculations. This standard applies to the determination of the physical and mechanical tests when the moisture content. Principle 2 The sample timber quality than the quality of the water and completely dry the sample contains moisture content in the sample represents.3 Test Equipment3.1 Balance precision should reach 0.001g. 3.2 oven should be able to maintain at (103 ± 2) ℃. 3.3 weighing bottle and glass dryer.4 Sample4.1 Determination of the sample usually need moisture test material on the test strip, or on the sample after the physical and mechanical tests, in accordance with the corresponding standard test Act interception sites. Sample size was about 20mm × 20mm × 20mm. Wood, 4.2 pieces attached on the sample should be removed.5 test procedure5.1 to take samples should be numbered, weighed as soon as possible, and to populate the records in the table in Appendix A, accurate to 0.001g. 5.2 The moisture content of the test samples of the same batch made, together into an oven at a temperature of (103 ± 2) ℃ for 8h after drying, selected from 2 ~ 3 samples once again that after weighing the selected sample once every 2h to the difference between the last two weighing not more than the quality of the sample At 0.5%, that is, that the sample was at all dry. 5.3 tweezers with dry specimens removed from the oven, put the weighing bottle containing glass desiccant dryer within the weighing bottle and cover Dryer cover. After the sample was cooled to room temperature and 5.4, with a dry flask forceps claiming to remove weighing. 5.5 As for the sample contains more volatile substances (resins, gums, etc.) of the timber, in order to avoid using the drying method for the determination of the moisture content of an excessive Error, should be measured (see Appendix B) to switch to vacuum drying.6 calculated resultsThe moisture content of the sample according to equation (1) calculated to the nearest 0.1%. 100 (1) Where. W --- moisture content of the sample,%; ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 1931-2009_English be delivered?Answer: Upon your order, we will start to translate GB/T 1931-2009_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 1931-2009_English with my colleagues?Answer: Yes. 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Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 1931-2009 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. |
