1、Designation: D1490 01 (Reapproved 2018)Standard Test Method forNonvolatile Content of Urea-Formaldehyde Resin Solutions1This standard is issued under the fixed designation D1490; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of the appar-ent nonvolatile content of urea-formaldehyde resin solu
3、tionsintended for use as wood adhesives. Due to the chemical natureof such resins, the nonvolatile content determined variesmarkedly according to the type of test used. In order tominimize this condition, this test method is designed to yieldreasonably uniform agreement among different laboratoriest
4、esting specimens from the same sample.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 standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the
5、user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established
6、in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D907 Terminology of Adhesives3. Terminology3.1 DefinitionsMany terms i
7、n this test method are definedin Terminology D907.4. Significance and Use4.1 Wood adhesive performance and cost is often related tothe solids level (nonvolatile content).4.2 This test method determines the apparent nonvolatilecontent for urea-formaldehyde resins.5. Apparatus5.1 Analytical Balance, a
8、ccurate to 61.0 mg.5.2 ThermometerA glass thermometer having a rangefrom 0 to 110 or 150C (32 to 230 or 302F) and accurate to61C (62F) at the required immersion.5.3 Constant-Temperature Oven, capable of maintaining atemperature of 105 6 1C (221 6 2F) and an air turnover of15 to 17 times per min. Use
9、 only one shelf for supporting thespecimens. Position this shelf in the upper third of the oven, asnear one third from the ceiling as possible. Level the shelf towithin 0.025 mm from edge to edge in all directions. Place thethermometer bulb as close to the center of the shelf as possible.5.4 Tared L
10、unge Weighing Pipet, stoppered weighing bottle,or equivalent dispenser for accurately weighing by difference.5.5 Drying Dishesaluminum foil dishes, with 57 to58-mm inside diameter and 17 mm deep, with flat bottoms,having a tolerance of 60.076 mm.5.6 Desiccator, with tray, containing active anhydrous
11、 cal-cium chloride desiccant.6. Sampling6.1 Take a sufficient quantity of the resin lot being evaluatedto conduct the test. While the test consumes less than 10 g ofresin, a sample of approximately 0.23 L (12 pt) is suggested toensure that it is representative and will permit rechecks, ifnecessary.
12、Record the lot number of the resin being used.6.2 As urea-formaldehyde resin solutions have a varyingtendency toward mild settling or stratification, agitate the resinthoroughly before sampling, and mix the sample well before itis used in the test.7. Procedure7.1 Preparation of Test SpecimensPlace a
13、 portion of thesample in the weighing dispenser and weigh to 61.0 mg.Transfer a sufficient amount of the sample to yield 0.45 6 0.05g of dried residue, to a tared drying dish which has beenpreviously dried for1hat1056 1C (221 6 2F), and cooledand held in the desiccator until time of use. Reweigh the
14、dispenser and determine, by difference to 61.0 mg, the exact1This test method is under the jurisdiction of ASTM Committee D14 onAdhesives and is the direct responsibility of Subcommittee D14.30 on WoodAdhesives.Current edition approved Aug. 1, 2018. Published August 2018. Originallyapproved in 1957.
15、 Last previous edition approved in 2013 as D1490 01 (2013).DOI: 10.1520/D1490-01R18.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary p
16、age onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for
17、theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1weight of the specimen transferred to the drying dish. Preparea total of three such specimens from the contents of theweighing dispenser. Pipet 5
18、mL (0.01 pt) of water into eachtared drying dish and mix the water and resin thoroughly bygently rotating the dish.7.2 Drying the SpecimensPlace the drying dishes contain-ing the diluted specimens in the temperature oven, previouslyadjusted to 105 6 1C (221 6 2F) with the oven vents and airflow adju
19、sted to maintain an air turnover of 16 6 1 times permin. Do this within 30 min after the specimens have beenplaced in the dishes. Open the oven door for the minimumpracticable time (never longer than 15 s). Place the dishes onthe shelf, which has been positioned in accordance with 5.3,grouping them
20、about the center in the vicinity of the thermom-eter bulb. The dishes remain in the oven for a total of 3 h 65min.7.3 Weighing the Dried SpecimensRemove the dishescontaining the dried specimens from the oven after the 3-hdrying period in accordance with 7.2, place them in thedesiccator, and cool to
21、room temperature for at least 5, but notmore than 15 min. Then remove them from the desiccator andimmediately weigh each specimen to 61.0 mg. Discard thedishes after their first use.8. Calculation8.1 Calculate the percent of nonvolatile matter as follows:Nonvolatile matter, % 5 A/B! 3100where:A = we
22、ight of dish containing dried residue, less taredweight of dish, andB = weight of dispenser before specimen is removed, lessweight of dispenser after specimen is removed.9. Report9.1 Report the following information:9.1.1 Date of test,9.1.2 Laboratory where test is performed,9.1.3 Manufacturers code
23、 number and lot number of resintested,9.1.4 Designation of test,9.1.5 Individual and average nonvolatile values obtained,%, and9.1.6 Any conditions that deviated from those prescribed inthis test method.10. Precision and Bias10.1 The precision and bias statement for this test methodhas not been dete
24、rmined yet. Results are being expected byApril 2003.11. Keywords11.1 nonvolatile content; urea-formaldehydeASTM 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
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26、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
27、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 re
28、prints (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). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 01 (2018)2
