GB/T 1933-2009 English PDFUS$359.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 1933-2009: Method for determination of the density of wood Status: Obsolete GB/T 1933: Historical versions
Basic dataStandard ID: GB/T 1933-2009 (GB/T1933-2009)Description (Translated English): Method for determination of the density of wood Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: B60 Classification of International Standard: 79.020 Word Count Estimation: 8,890 Date of Issue: 2009-02-23 Date of Implementation: 2009-08-01 Older Standard (superseded by this standard): GB/T 1933-1991 Quoted Standard: GB/T 1928-2009; GB/T 1929-2009; GB/T 1931-2009 Adopted Standard: ISO 3131-1975, MOD Regulation (derived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 wood density test equipment, specimens, test procedures and results of calculations. This standard applies to the sample timber unblemished small air-dry density, determination of total dry density and basic density. GB/T 1933-2009: Method for determination of the density 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 density of wood ICS 79.020 B60 National Standards of People's Republic of China Replacing GB/T 1933-1991 Wood Density Determination (ISO 3131. 1975, Wood-Determinationofdensityforphysicaland mechanicaltests, 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 ISO 3131. 1975 "when the physical and mechanical tests - Determination of density." This standard and ISO 3131. 1975 The main technical differences compared as follows. --- Increased drainage content measured by volume. This standard replaces GB/T 1933-1991 "wood density determination." This standard compared with GB/T 1933-1991 Technical changes as follows. --- Increased 4.3 content; --- Delete all the contents of the original 5.1.3, Clause No. postponed; --- Increasing the drainage volume measurement of test specimens are prepared in 7.1.2; --- Added "Determination Act drainage sample volume" content; extended to the original terms of number 7.2.2 7.2.3, and the basic density measurement portion Content has been amended accordingly; --- Added Appendix C "sample volume determination method of drainage," the test results are reported in Table; --- Increasing the test results are explained, and Appendices A and B has been amended accordingly. The Standard Appendix A, Appendix B, Appendix C 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. Chinese Academy of Forestry Forestry Institute for New Technologies. The main drafters of this standard. Lv Jianxiong, Huangrong Feng, Zhao ke, this fee Hua Zhao Rongjun, Yuhua Jiang, Huang Anmin. 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. Wood Density Determination1 ScopeThis standard specifies the determination of wood density test equipment, samples, test procedures and results of calculations. This standard applies to wood unblemished small sample air-dry density, total dry measuring density and basic density.2 Normative referencesThe following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 1928-2009 physical and mechanical test methods - General GB/T 1929-2009 physical and mechanical test materials and test specimens sawing method GB/T 1931-2009 Method for determination of moisture content of wood Principle 3 Measuring the mass, the volume of the sample, in order to the density of the wood.4 Test Equipment4.1 length measurement tool, measurements should be accurate to 0.001mm. 4.2 GB/T 1931-2009 Chapter 3 test equipment requirements. 4.3 using the drainage volume measurement, you need a beaker, stents, metal pins and balance. Determination of air-dry density of 5 5.1 Sample 5.1.1 Test timber sawing and test specimens according to the provisions of GB/T 1929-2009 Chapter 3 performed. 5.1.2 Sample size is 20mm × 20mm × 20mm. Precision production and testing, adjust the moisture content of the sample specimen, respectively The provisions of GB/T 1928-2009 Chapter 3 and Chapter 4 were. 5.1.3 When a species in a sample of the ring when the average width of 4mm or more, the sample size should be increased to 50mm × 50mm × 50mm. For the production of sample test block, the north-south direction of the continuous intercept sample from outside the pith, and left foot and shrinkage allowance. 5.2 Test procedure 5.2.1 in the opposite side of the center position of the specimen were measured tangential and radial direction parallel to grain size, accurate to 0.001mm. Can make Measurement of sample volume by water displacement method, the result is accurate to 0.001cm3. Said the mass of the sample to the nearest 0.001g. 5.2.2 The sample was placed in an oven starting temperature 60 ℃ maintained 4h, press GB/T 1931-2009 the provisions of 5.2 to 5.4 bake Dried and weighed. 5.2.3 Full sample dry mass was weighed out immediately after each of the opposite side in the center position of the specimen were measured tangential and radial direction parallel to grain size, Accurate to 0.001mm. 5.3 Calculation Results 5.3.1 The moisture content of the sample W when air-dry density shall formula (1) calculation, accurate to 0.001g/cm3. ρW = M1 W Vp W (1) ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 1933-2009_English be delivered?Answer: Upon your order, we will start to translate GB/T 1933-2009_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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Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.Question 5: Should I purchase the latest version GB/T 1933-2009?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 1933-2009 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. |
