ASTM D2921-1998(2005) Standard Test Method for Qualitative Tests for the Presence of Water Repellents and Preservatives in Wood Products《木制品中的防水剂与防腐剂的定量试验的试验方法》.pdf

《ASTM D2921-1998(2005) Standard Test Method for Qualitative Tests for the Presence of Water Repellents and Preservatives in Wood Products《木制品中的防水剂与防腐剂的定量试验的试验方法》.pdf》由会员分享，可在线阅读，更多相关《ASTM D2921-1998(2005) Standard Test Method for Qualitative Tests for the Presence of Water Repellents and Preservatives in Wood Products《木制品中的防水剂与防腐剂的定量试验的试验方法》.pdf（2页珍藏版）》请在麦多课文档分享上搜索。

1、Designation: D 2921 98 (Reapproved 2005)Standard Test Method forQualitative Tests for the Presence of Water Repellents andPreservatives in Wood Products1This standard is issued under the fixed designation D 2921; the number immediately following the designation indicates the year oforiginal adoption

2、 or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers simple qualitative field orlaboratory tests to dete

3、rmine water repellency or the presenceof chlorinated phenol2preservative chemicals in wood prod-ucts that are specified to be water repellent preservative treated.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This sta

4、ndard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1

5、U.S. Federal Specification:TT-W-572 Wood Preservative Water-Repellant32.2 NIST Standard:262-63 Water Repellent Preservative Non-Pressure Treat-ment for Mill Work43. Significance and Use3.1 Although chlorinated phenol-treated wood has becomeless common due to environmental concerns, repellent-treated

6、wood is commonly specified in construction. This test methodprovides a means to verify the presence of a significant level ofwater repellent protection.4. Apparatus4.1 Eyedropper, plastic squeeze bottle or similar means formetering drops of water.4.2 Flame Source, such as bunsen burner, butane torch

7、, oralcohol burner.4.3 Copper Wire Coil Specimen Holder (or Other SuitableCopper Holder)A suitable copper wire coil can be made byusing a lead pencil as a mandrel to form a helix using copperwire of about 1.6 to 2.4 mm (116 to332 in.) in diameter. Leavea space of approximately the diameter of the wi

8、re between eachloop. The helix should be 19 to 25 mm (34 to 1 in.) in length.Leave a pigtail of about 152 mm (6 in.) of wire at one end ofthe helix and form a loop of approximately 25 mm (1 in.) indiameter to be used as a holder for the coil.4.4 Sharp Knife.5. Water Repellent Test5.1 Place uncut woo

9、d items to be tested so that the end grainis exposed as a horizontal surface. If the end grain cannot be sopositioned, comparisons can be made on the flat grain but withless definitive results.5.2 With an eye dropper, or similar device, allow severaldrops of water to fall from about 13 mm (12 in.) o

10、n the endgrain of the wood. Wait 5 min and then observe the degree ofpenetration. With flat grain or vertical grain surfaces, waitingperiods of 10 to 15 min may be necessary.5.3 Water drops that immediately flatten out, penetrate anddarken the wood, indicate that the wood has not been treatedwith a

11、water repellent.5.4 Water drops that “bead-up” and remain as spheres, withlittle or no color change or penetration, indicate that the woodhas been treated with a water repellent. Water repellentpreservatives, meeting Fed. Spec. TT-W-572 and NBSStandard 262-63, impart sufficient water repellency to t

12、he endgrain of wood to cause water drops to bead up and formspheres.6. Preservative Test6.1 Chlorinated phenol based wood preservatives emit acharacteristic green flame upon pyrolysis within a ventilatedcopper envelope due to the release of chlorine and its conse-quent reaction with copper (Beilstei

13、ns test). Untreated woodproduces a yellow-orange flame but any chlorine containingcompound will give a positive test.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.52 on F

14、actory Coated Wood Products.Current edition approved May 15, 2005. Published June 2005. Originallyapproved in 1970. Last previous edition approved in 1998 as D 2921 98.2Pentachlorophenol, tetrachlorophenol and other chlorinated phenols.3Available from Standardization Documents Order Desk, DODSSP, Bl

15、dg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098.4Available from National Institute of Standards and Technology (NIST), 100Bureau Dr., Stop 3460, Gaithersburg, MD 20899-3460.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United Stat

16、es.6.2 Using the copper wire specimen holder, described in4.3, hold the coil portion in the flame until it burns with acharacteristic yellow-orange color. This preheated coil is thenallowed to cool.6.3 With a knife, cleaned by heating after each use, cut asplinter from the specimen of wood to be tes

17、ted. Samplesshould be taken near the end of the wood items where end grainis exposed and where normal concentration of the preservativechemicals is greatest. The size of the wood sample should besmaller than the length and inner diameter of the coil.6.4 With the copper coil held horizontally, place

18、the splinterin the center of the coil. Put the copper coil with wood splinterin the flame and burn. If chlorinated phenols are present, thecharacteristic green flame is produced. Untreated wood pro-duces the yellow-orange flame.7. Accuracy7.1 The tests are less accurate on flat grain and the heart-w

19、ood of some wood species, so that end grain and sapwoodshould be used whenever possible.7.2 Tests on both a known untreated sample and a treatedsample of the same wood species will provide comparisonstandards for the operator and will improve the accuracy of thetests.7.3 Test results are improved if

20、 tests are made with woodsamples taken from the center of a stack or from a protectedarea where the possibility of contamination is least. Untreateditems which come in physical contact with preservative treatedproducts during handling and shipping may show slight evi-dence of the preservative chemic

21、al.7.4 More than one wood sample obtained from differentareas from the unknown piece should be tested.8. Precision and Bias8.1 PrecisionNo numerical statement of precision is pos-sible in this qualitative test method. One hundred percentagreement was obtained in a round-robin test.8.2 BiasBias has n

22、ot been determined.9. Keywords9.1 chlorinated phenols; water repellents; wood preserva-tives; wood productsASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised th

23、at determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reappr

24、oved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you f

25、eel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 2921 98 (2005)2