ASTM_D_1490_-_01_2013.pdf

Designation:D149001(Reapproved 2013)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 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.Scope*1.1 This test method covers the determination of the appar-ent nonvolatile content of urea-formaldehyde resin solutionsintended 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 laboratoriestesting 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 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 ASTM Standards:2D907 Terminology of Adhesives3.Terminology3.1 DefinitionsMany terms in 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,accurate 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 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 Lunge Weighing Pipet,stoppered weighing bottle,or equivalent dispenser for accurately weighing by difference.5.5 Drying Dishesluminum foil dishes,with 57 to 58-mminside diameter and 17 mm deep,with flat bottoms,having atolerance of 60.076 mm.5.6 Desiccator,with tray,containing active anhydrous 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(12pt)is suggested toensure that it is representative and will permit rechecks,ifnecessary.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 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 for 1 h at 105 6 1C(221 6 2F),and cooledand held in the desiccator until time of use.Reweigh thedispenser and determine,by difference to 61.0 mg,the exactweight of the specimen transferred to the drying dish.Preparea total of three such specimens from the contents of theweighing dispenser.Pipet 5 mL(0.01 pt)of water into eachtared drying dish and mix the water and resin thoroughly bygently rotating the dish.1This 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 May 1,2013.Published May 2013.Originallyapproved in 1957.Last previous edition approved in 2006 as D1490 01(2006).DOI:10.1520/D1490-01R13.2For 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 page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 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 adjusted 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