ASTM_D_4559_-_99_2018.pdf

Designation:D455999(Reapproved 2018)Standard Test Method forVolatile Matter in Silicone Fluid1This standard is issued under the fixed designation D4559;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.Scope1.1 This test method describes a procedure for determiningthe volatile matter in silicone fluids used for electrical insula-tion.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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,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 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:2D923 Practices for Sampling Electrical Insulating LiquidsD5423 Specification for Forced-Convection Laboratory Ov-ens for Evaluation of Electrical Insulation3.Summary of Test Method3.1 Specimens are weighed before and after heating for aspecific time in a forced air oven to determine weight loss.4.Significance and Use4.1 High values may indicate contamination of the siliconewith other materials,inadequate removal of volatile compo-nents by the producer,or the presence of a depolymerizationcatalyst.4.2 The outcome will be affected directly by the presence ofany high vapor pressure material in the sample,such assolvents or low molecular weight silicones.4.3 A high volatile content could also indicate the presenceof a depolymerization catalyst in the fluid.The time andtemperature specified in this test method are ideal for detectingthe effect of such a material,as the depolymerization takesplace at a highly accelerated rate and the low molecular weightcomponents are rapidly evaporated.The result is a verysignificant weight loss during the test period.The exact amountdepends on the type and amount of catalyst present.Theconditions specified in the method should not cause measure-able depolymerization of silicone if such a catalyst is notpresent.5.Apparatus5.1 Air-circulating Oven,capable of meeting the require-ments of Specification D5423.5.2 Griffn Pyrex Beakers,50-mL,with the following di-mensions:5.2.1 Outside Diameter42 6 0.6 mm.5.2.2 Wall Thickness0.14 to 0.165 mm.5.3 Analytical Balance,capable of measuring to 1 mg.6.Sampling6.1 Obtain a sample of the silicone fluid to be tested usingappropriateASTM sampling apparatus in accordance with TestMethods D923.7.Procedure7.1 Clean two 50-mL beakers by washing in toluene,followed by a rinse in acetone or other appropriate cleaningmethod.7.2 Bake two 50-mL beakers at 150 6 5C for a minimumof 1 h,transfer to a desiccator using clean,dry gloves orcrucible tongs and cool the beakers to ambient temperatures.Use clean,dry gloves or crucible tongs to handle beakers fromthis point forward.Weigh each beaker to the nearest mg(T).7.3 Weigh a 2.0 6 0.2 g sample to the nearest mg in eachbeaker(W1).7.4 Heat at 150 6 5C in an air circulating oven for 24 60.25 h,cool in a desiccator,and reweigh(W2).1This test method is under the jurisdiction of ASTM Committee D27 onElectrical Insulating Liquids and Gasesand is the direct responsibility of Subcom-mittee D27.07 on Physical Test.Current edition approved Dec.1,2018.Published December 2018.Originallyapproved in 1986.Last previous edition approved in 2010 as D4559 99(2010).DOI:10.1520/D4559-99R18.2For 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.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 theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 8.Calculation and Report8.1 Calculate the volatile matter in silicone fluid as follows:Volatile Matter,%5W12 W2W12 T3100where:W1=weight of silicone fluid and beaker,W2=weight of silicone fluid and beaker after heating,andT=weight of beaker.8.2 Calculate the volatile matter,as the simple averagepercentage of the two tests.8.3 Report the simple average of the two te