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Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 1927.5-2021: Test methods for physical and mechanical properties of small clear wood specimens - Part 5: Determination of density Status: Valid
Basic dataStandard ID: GB/T 1927.5-2021 (GB/T1927.5-2021)Description (Translated English): Test methods for physical and mechanical properties of small clear wood specimens - Part 5: Determination of density Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: B68 Word Count Estimation: 11,184 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 1927.5-2021: Test methods for physical and mechanical properties of small clear wood specimens - Part 5: Determination of density---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. Test methods for physical and mechanical properties of small clear wood specimens -- Part 5: Determination of density ICS 79:040 CCSB68 National Standards of People's Republic of China Replacing GB/T 1933-2009 Test method for physical and mechanical properties of wood with small sample without defect Part 5: Density determination (ISO 13061-2:2014, Physical and mechanical properties of wood- 2021-12-31 Released 2022-07-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration forewordThis document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" drafted: This document is part 5 of GB/T 1927 "Test Methods for Physical and Mechanical Properties of Small Specimens of Wood without Defects": GB/T 1927 has been issued The following parts are distributed: --- Part 1: Collection of test materials; --- Part 2: Sampling methods and general requirements; --- Part 3: Determination of growth ring width and latewood rate; --- Part 4: Determination of moisture content; --- Part 5: Density determination; --- Part 6: Determination of dry shrinkage; --- Part 7: Determination of water absorption; --- Part 8: Determination of swelling properties; --- Part 9: Determination of flexural strength; --- Part 10: Determination of flexural modulus of elasticity; --- Part 12: Determination of transverse grain compressive strength; --- Part 17: Determination of impact toughness; --- Part 18: Determination of impact indentation; --- Part 19: Determination of hardness; --- Part 20: Determination of splitting resistance: This document replaces GB/T 1933-2009 "Determination of Wood Density": Compared with GB/T 1933-2009, except for structural adjustment and compilation In addition to the editorial changes, the main technical changes are as follows: a) Changed the content of the scope (see Chapter 1, Chapter 1 of the:2009 edition); b) terms and definitions are added (see Chapter 3); c) Changed the dimensional measurement accuracy (see Chapter 5, Chapter 4 of the:2009 edition); d) Added the content of wood density determination under the corresponding moisture content (see Chapter 6); e) Changed the conversion formula of air-dry density (see Chapter 7, Chapter 5 of the:2009 edition); f) Changed the calculation formula of absolute dry density (see 8:3, 6:3 of the:2009 edition); g) Changed the sample preparation and calculation formula for basic density determination (see 9:1:2 and 9:3, 7:1:2 and 7:3 of the:2009 edition); h) Changed the Appendix A record table (see Appendix A Table A:1, Table A:3 and Table A:4, Appendix A, Appendix B and Appendix C of the:2009 edition): This document is modified to adopt ISO 13061-2:2014 "Test methods for the physical and mechanical properties of wood with small defect-free specimens - Part 2: Density Measurement": Compared with ISO 13061-2:2014, this document has made the following structural adjustments: --- Chapter 6, Chapter 7, Chapter 8 and Chapter 9 correspond to Chapter 6, Chapter 7 and Chapter 8 in ISO 13061-2:2014, where 6:1, 7:1 and 8:1 correspond to 6:1~6:3 in ISO 13061-2:2014, and 9:1 corresponds to 6:1~ in ISO 13061-2:2014 6:3 and Chapter 4 Notes, 6:2 correspond to Chapter 4 Notes in ISO 13061-2:2014 and 7:1, 7:2 correspond to ISO 13061-2: 7:1, 6:3 and 7:3 in:2014 correspond to 8:1, 8:2, 8:3, 9:2 and 9:3 in ISO 13061-2:2014 respectively 7:2, 8:2, 7:3 and 8:3 of ISO 13061-2:2014; --- Chapter 10 corresponds to Chapter 9 in ISO 13061-2:2014: The technical differences between this document and ISO 13061-2:2014 and their reasons are as follows: --- Changed the source of terminology (see Chapter 3) to ensure the professionalism and uniformity of terminology; --- Some terms are deleted (see Chapter 3), and only terms directly related to wood density are retained; --- Changed the accuracy of dimension and mass measurement (see 5:1 and 5:2) to improve scientificity; --- Changed the accuracy of density calculation (see 6:3, 7:3, 8:3 and 9:3) to improve scientificity; --- Added the specific content of volume measurement by drainage method (see 9:2:2): The following editorial changes have been made to this document: --- In order to harmonize with the existing standards, the name of the standard is changed to "Test methods for physical and mechanical properties of wood with small samples without defects - Part 5: Confidentiality" Degree Measurement"; --- Changed the expression of the scope of application of the standard (see Chapter 1); --- Changed the expression of the principle (see Chapter 4); --- Included in the technical errata corrections of ISO 13061-2:2014/AMD1:2017, supplemented the test report should include at least Information "b) Dimensions of the specimen" (see 10:2); --- Added Appendix A (informative) "Wood Density Determination Record Form"; --- Removed references: Please note that some content of this document may be patented: The issuing agency of this document assumes no responsibility for identifying patents: This document is proposed by the State Forestry and Grassland Administration: This document is under the jurisdiction of the National Timber Standardization Technical Committee (SAC/TC41): This document is drafted by: Institute of Wood Industry, Chinese Academy of Forestry, Institute of New Forestry Technology, Chinese Academy of Forestry, Xiamen Minghongtang Arts & Crafts Co:, Ltd:, Zhejiang Shiyou Wood Co:, Ltd:, Suzhou David Wood Co:, Ltd: The main drafters of this document: Jiang Jiali, Lv Jianxiong, Huang Rongfeng, Zhao Youke, Fei Benhua, Zhao Rongjun, Yu Huaqiang, Huang Anmin, Huang Can, Ni Yuezhong, Jiang Wei: The previous versions of this document and its superseded documents are as follows: --- First published in 1980 as GB/T 1933-1980, first revised in:1991, second revised in:2009; --- This is the third revision, adjusted to Part 5 of GB/T 1927:IntroductionThe standard of test methods for physical and mechanical properties of wood is used in wood scientific research, teaching, wood inspection, wood structure design, wood processing and production, etc: It is widely used and is an important basic standard in the wood industry: In 1980, my country issued the first edition of the test methods for physical and mechanical properties of wood: The domestic standard (GB/T 1927~GB/T 1943) was revised twice in:1991 and:2009 respectively: In recent years, with the development of wood science and technology The development of technology, ISO 3129:2012 "Sampling methods for wood physical and mechanical tests of small samples of wood without defects and "General Requirements" has been revised, and ISO 3130:1975 "Determination of moisture content by physical and mechanical tests of wood", ISO 3131:1975 "Wood 15 international standards for test methods such as "Determination of Density by Physical and Mechanical Testing of Materials" have been integrated and revised: Based on this, in order to be in line with international standards, This time, the third revision was made to the national standard for test methods for physical and mechanical properties of wood in my country, and the 22 scattered test methods were integrated and adjusted to The sub-part document of GB/T 1927 adopts the latest version of the international standard in the revision: GB/T 1927 aims to establish a test method for the physical and mechanical properties of wood with small samples without defects: It is intended to be composed of 21 parts: --- Part 1: Collection of test materials: The purpose is to describe the sample collection method for testing the physical and mechanical properties of wood with small samples without defects: --- Part 2: Sampling methods and general requirements: The purpose is to establish a suitable test for the physical and mechanical properties of small wood samples without defects: Specimen sawing, interception methods and general requirements to be observed when testing methods: --- Part 3: Determination of growth ring width and latewood rate: The purpose is to characterize the growth ring width and latewood rate of small samples of clear wood method of determination: --- Part 4: Determination of moisture content: The purpose is to describe a method for the determination of the moisture content of small wood samples without defects: --- Part 5: Density determination: The purpose is to describe the density, air-dry density, absolute dry Methods for the determination of density and basic density: --- Part 6: Determination of dry shrinkage: The purpose is to describe the measurement of radial, chordwise and volume drying shrinkage of unblemished small sample wood: determined method: --- Part 7: Determination of water absorption: The purpose is to describe the determination method of 6h, 24h and the maximum water absorption rate of small sample wood without defect: --- Part 8: Determination of swelling: The purpose is to describe the measurement of radial, chordwise and volumetric swell of unblemished small wood samples: determined method: --- Part 9: Determination of flexural strength: The purpose is to describe a method for the determination of the flexural strength of small wood samples without defects: --- Part 10: Determination of flexural modulus of elasticity: The purpose is to describe a method for the determination of the flexural modulus of elasticity of small wood samples without defects: --- Part 11: Determination of compressive strength along grain: The purpose is to describe a method for the determination of the compressive strength along the grain of small wood samples without defects: --- Part 12: Determination of transverse grain compressive strength: The purpose is to describe the transverse grain compressive proportional ultimate strength of small unblemished wood samples, including Methods for the determination of the total compressive proportional ultimate strength of the horizontal grain and the partial compressive proportional ultimate strength of the horizontal grain: --- Part 13: Determination of compressive elastic modulus of transverse grains: The purpose is to describe the measurement of the transverse-grain compressive elastic modulus of unblemished small samples of wood: determined method: --- Part 14: Determination of tensile strength along grain: The purpose is to describe a method for the determination of the along-grain tensile strength of unblemished small samples of wood: --- Part 15: Determination of transverse grain tensile strength: The purpose is to describe a method for the determination of the transverse grain tensile strength of small wood samples without defects: --- Part 16: Determination of shear strength along grain: The purpose is to describe a method for the determination of the shear strength along the grain of small wood samples without defects: --- Part 17: Determination of impact toughness: The purpose is to describe a method for the determination of the chordwise impact toughness of small unblemished wood samples: --- Part 18: Determination of impact indentation: The purpose is to describe a method for the determination of the impact indentation resistance of unblemished small samples of wood: --- Part 19: Determination of hardness: The purpose is to describe a method for the determination of radial, chord, and longitudinal hardness of small, unblemished wood samples: --- Part 20: Determination of splitting resistance: The purpose is to describe the method for the determination of the splitting resistance on the radial and chord surfaces of small wood samples without defects: --- Part 21: Determination of nail holding force: The purpose is to describe a method for the determination of the nail-holding force of small samples of wood without defects: Test method for physical and mechanical properties of wood with small sample without defect Part 5: Density determination1 ScopeThis document describes the test method for the determination of wood density: This document is applicable to the determination of the density, air-dry density, absolute dry density and basic density of unblemished small sample wood at the corresponding moisture content:2 Normative referencesThe contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document: GB/T 1927:2-2021 Test methods for physical and mechanical properties of wood with small unblemished samples - Part 2: Sampling methods and general requirements (ISO 3129:2019, MOD) GB/T 1927:4-2021 Test methods for physical and mechanical properties of wood with small samples without flaws-Part 4: Determination of moisture content (ISO 13061-1:2014, MOD) LY/T 1788-2008 Terms of wood properties3 Terms and DefinitionsThe terms and definitions defined in LY/T 1788-2008 and the following terms and definitions apply to this document: 3:1 densityofwood The mass of wood per unit volume: [Source: LY/T 1788-2008, 3:3:2] 3:2 air-drydensity The ratio of mass to volume when wood reaches equilibrium moisture content in a certain atmospheric state: Note: Generally refers to the density value when the moisture content is 12%: [Source: LY/T 1788-2008, 3:3:4, with modifications] 3:3 Oven-drydensity The ratio of the dry mass of the wood to the dry volume of the wood: 3:4 basic density The ratio of the dry mass of the wood to the volume of the green wood: [Source: LY/T 1788-2008, 3:3:3, with modifications] ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 1927.5-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 1927.5-2021_English as soon as possible, and keep you informed of the progress. 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