GB/T 13942.1-2009 English PDFUS$189.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 13942.1-2009: Durability of wood -- Part 1: Method for laboratory test of natural decay resistance Status: Valid GB/T 13942.1: Historical versions
Basic dataStandard ID: GB/T 13942.1-2009 (GB/T13942.1-2009)Description (Translated English): Durability of wood -- Part 1: Method for laboratory test of natural decay resistance Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: B60 Classification of International Standard: 79.020 Word Count Estimation: 8,877 Date of Issue: 2009-02-23 Date of Implementation: 2009-08-01 Older Standard (superseded by this standard): GB/T 13942.1-1992 Quoted Standard: GB/T 14019 Regulation (derived from): National Standard Approval Announcement 2009 No.3 (Total No.143)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 quality loss of timber under laboratory conditions, wood rot fungi on wood caused by infection. Test methods to assess levels of natural decay of wood. This section applies to assessment under laboratory conditions of natural wood decay levels. GB/T 13942.1-2009: Durability of wood -- Part 1: Method for laboratory test of natural decay resistance---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. Durability of wood Part 1. Method for laboratory test of natural decay resistance ICS 79.020 B60 National Standards of People's Republic of China Replacing GB/T 13942.1-1992 Wood durability Part 1. Laboratory test methods for natural decay 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 ForewordGB/T 13942 "Wood Durability" is divided into two parts. --- Part 1. Laboratory test methods for natural decay; --- Part 2. Test methods for natural durability field. This section GB/T 13942 Part 1. This Part replaces GB/T 13942.1-1992 "Standard Test Method for natural durability of wood timber natural decay of the laboratory test side law". This section compared with the GB/T 13942.1-1992 The main changes are as follows. Forestry Culture Collection Center (CFCC) numbering rules for each of the standard test species are numbered; --- Add "a wide-mouth screw-cap bottle cap circle" as an alternative culture flask, and the corresponding increase in media preparation methods and access Species schematic; --- Edit "control sample by the mass loss rate after the decay test should be more than 25%" to "should be more than 45%"; --- Edit "oven temperature of the sample was measured before and after testing all dry mass of (103 ± 2) ℃". Appendix A of this section is informative appendix. This part by the State Forestry Administration. This part of the National Standardization Technical Committee centralized timber. This section is responsible for drafting units. China Forestry Science Institute of Wood Industry. Participated in the drafting of this section. Guangdong Provincial Academy of Forestry. The main drafters of this section. Yang Zhong, Maxing Xia, Liu Lei, Su Haitao, Jiang Mingliang. This part of the standard replaces the previous editions are. --- GB/T 13942.1-1992. Wood durability Part 1. Laboratory test methods for natural decay1 ScopeThis section GB/T 13942 specifies the wood mass loss in laboratory conditions, wood rot fungi on the wood caused by infection, in order to comment Test methods for natural wood decay constant level. This section applies to assessment under laboratory conditions of natural wood decay levels.2 Normative referencesThe following documents contain provisions which, through reference GB/T 13942 in this section constitute provisions of this section. For dated reference documents Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section. GB/T 14019 wood preservative term3 Terms and DefinitionsTerms and definitions GB/T 14019 apply to this part of the established GB/T 13942 of.4 Principle Test MethodWood rot fungi secrete enzymes degrade and absorb the wood components, wood corrupt and cause loss of quality timber of various degrees of wood decay and quality Different Loss.5 Test Equipment5.1 steam autoclave. design pressure 0.25MPa, the design temperature of 138 ℃. 5.2 vaccination room or clean bench. 5.3 bacteria culture chamber or electric incubator. temperature (28 ± 2) ℃, relative humidity of 75% to 85%. 5.4 Analysis of balance. a sense of the amount of 0.01g. 5.5 flasks. 500mL flask wide mouth with screw caps or wide-mouth bottle dome (minimum volume 250mL, minimum diameter 32mm, thread Cover can be sterilized).6 Sample and feeding wood6.1 test material taken from the site of trees at breast height 3 ~ 5 logs more than 1m long section (diameter 180mm ~ 350mm) 2 Gen ~ 3. test Equal samples taken from each plant timber trees heartwood segment cross section uniformly distributed at no visible defects in healthy trees near the site of the pith of heartwood sampling. 6.2 Each sample surface should be smooth, not allowed to have visible defects. Dimensions of 20mm × 20mm × 10mm (grain direction) (see FIG. 1) External heartwood at least 12 (Equal taken 2 ~ 3 logs). Ring width should be the width of the average tree rings within ± 20% range. ...... |
