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GB/T 1931-2009: Method for determination of the moisture content of wood
Status: Obsolete GB/T 1931: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 1931-2009 | English | 279 |
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Method for determination of the moisture content of wood
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GB/T 1931-2009
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| GB/T 1931-1991 | English | 199 |
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Method for determination of the moisture content of wood
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GB/T 1931-1991
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PDF similar to GB/T 1931-2009
Basic data | Standard 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Count Estimation | 6,625 | | Date of Issue | 2009-02-23 | | Date of Implementation | 2009-08-01 | | Older Standard (superseded by this standard) | GB/T 1931-1991 | | Adopted Standard | ISO 3130-1975, MOD | | Regulation (derived from) | National Standard Approval Announcement 2009 No.3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
Foreword
This 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 wood
1 Scope
This 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 Equipment
3.1 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 Sample
4.1 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 procedure
5.1 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 results
The moisture content of the sample according to equation (1) calculated to the nearest 0.1%.
100 (1)
Where.
W --- moisture content of the sample,%;
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