ASTM_D_3259_-_95_2001e1.pdf

Designation:D 3259 95(Reapproved 2001)e1Standard Practice forInfrared Determination of the Temperature of AppliedCoatings on Wood Products During the Curing Cycle1This standard is issued under the fixed designation D 3259;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(e)indicates an editorial change since the last revision or reapproval.e1NOTEEditorial changes made in Section 3 in February 2001.1.Scope1.1 This practice is intended to serve as a guide in measur-ing with infrared instruments the temperature during the curingprocess of coatings applied to wood products.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.Significance and Use2.1 The forest products finishing industry has encountereddifficulties in measuring the temperature of painted surfacesprior to,during,and after the curing process.The use ofthermocouples is not entirely satisfactory because the thermo-couple wires tend to conduct heat away too rapidly from thearea where the temperature is being measured.Infrared radia-tion thermometers that are simple to operate can circumventthis difficulty.After calibration they are aimed at the surface,switched on,and the temperature read directly from anindicating gage.NOTE1Temperature-sensitive crayons,papers,and pellets may besuccessfully used to measure only the highest temperature reached bypainted surfaces during the curing cycle.2.2 There are several different types of infrared radiationthermometers,including those based on lead sulfide or ther-mistor sensors and those that are simple thermal voltaictransducers.As such they respond to different wavelengths ofinfrared radiation and have different areas of applicability.Only instruments that have been evaluated are included in thispractice.3.Apparatus3.1 The method of measurement has changed to includevirtually all non-surface contact measurement devices.Suchdevices may be portable(hand held)with nearly instantaneousreadout or stationary with a remote readout.3.2 Modern devices come equipped with an automaticemissivity compensation system.4.Procedure4.1 CalibrationCalibrate each instrument according to theinstructions of the manufacturer.Astandard blackbody capableof being controlled at various temperatures is almost essentialfor calibration.One such blackbody is a modified hot platewith a 13-mm(12-in.)thick aluminum plate and a ventilatedcowling to minimize the effects of ambient drafts.A dialthermometer with its stem within the aluminum plate serves tomonitor the temperature of the blackbody.4.2 Operation:4.2.1 Detailed instructions on the operation of each instru-ment are not included in this practice.Unless otherwise agreedfollow the manufacturers instructions in operating the equip-ment.4.2.2 One general precaution is that the instrument mustobserve only the surface being measured and not stray radia-tion from infrared heaters,sunlight,electric lights,or othersources.The permissible distance from the surface to thesensor depends upon the area of surface,the viewing angle ofthe instrument and the wavelength that the sensor responds to.Instruments operating only in the long wavelength region ofthe infrared spectrum are affected much less by stray radiationand by color variations.5.Keywords5.1 cure temperature;infrared;paint surface temperature;temperature measurement;wood coating1This practice is under the jurisdiction of ASTM Committee D-1 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofD01.52 on Factory Coated Wood Products.Current edition approved Nov.10,1995.Published January 1996.Originallypublished as D 3259 73.Last previous edition D 3259 84(1990)e1.1Copyright ASTM,100 Barr Harbor Drive,West Conshohocken,PA 19428-2959,United States.The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connectionwith any item mentioned in this standard.Users of this standard are expressly advised that determination of the validity of any suchpatent rights,and the risk of 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 reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM Headquarters.Your comments will receive careful consideration at a meeting of the responsibletechnic