ASTM_D_5145_-_09_2014.pdf

Designation:D514509(Reapproved 2014)Standard Test Methods forNonvolatile and Pigment Content of Electrocoat Baths1This standard is issued under the fixed designation D5145;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 These test methods cover the characterization of elec-trocoat baths through the determination of nonvolatile contentof inorganic pigment content.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD2832 Guide for Determining Volatile and Nonvolatile Con-tent of Paint and Related CoatingsE180 Practice for Determining the Precision of ASTMMethods for Analysis and Testing of Industrial and Spe-cialty Chemicals(Withdrawn 2009)33.Summary of Test Method3.1 Two specimens are accurately weighed into aluminumweighing dishes.The dishes are placed in an oven at 110C for1 h,reweighed to obtain the nonvolatile matter content and,ifrequired,placed in a muffle furnace at 500C for 2 h andweighed a third time to obtain the inorganic pigment content.4.Significance and Use4.1 The nonvolatile content and pigment content are mea-sures of total solids and inorganic pigment solids,respectively,in electrocoat paints.In addition to production quality control,these properties are important in maintaining electrocoat bathsin the optimum range.4.2 Other test methods for determining nonvolatile contentof paint and paint related materials are described in GuideD2832.5.Apparatus5.1 Analytical Balance with a sensitivity of 0.1 mg.5.2 Aluminum Weighing Dishes,57 mm in diameter and 17mm deep.These commercial dishes may contain a lubricantused during their manufacture.This should be removed byheating the aluminum dishes on a hot plate at 300C untilvapors are no longer visible.Store the dishes in a desiccatoruntil needed.5.3 Syringes,5-mL,disposable variety.5.4 Oven circulating,maintained at 110 6 2C.5.5 Muffle Furnace,maintained at 500 6 15C.6.Reagents6.1 Purity of WaterReferences to water shall be under-stood to mean water conforming to Type II of SpecificationD1193.7.Sampling and Sample Preparation7.1 Obtain the sample while the electrocoat bath is underproper circulation so a uniform sample is obtained.In the caseof a ultrafiltrate sample,the material should be thoroughlymixed or stirred prior to drawing the sample,thereby ensuringuniformity.7.2 After sampling,prior to removing the test specimen,it ismandatory the sample be shaken or stirred until it is homoge-neous and free of any settled material.This is particularlyimportant if there is a delay between sampling the bath andperforming this test procedure.The absence of settled materialshould be ascertained visually or by inserting a spatula andscraping the bottom of the container.Continue to shake or stirthe sample until specimens are taken for measurement.ThisPoint is Very Important.1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings,Materials,and Applications and are the directresponsibility of Subcommittee D01.21 on Chemical Analysis of Paints and PaintMaterials.Current edition approved July 1,2014.Published July 2014.Originally approvedin 1990.Last previous edition approved in 2009 as D5145 09.DOI:10.1520/D5145-09R14.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NONVOLATILE CONTENT8.Procedure8.1 Weigh two aluminum dishes separately,each to 0.1 mgand record as W1.8.2 Using a syringe,withdraw 1.0 to 1.5 mL of the wellmixed sample,then quickly weigh the syringe to 0.1 mg,recording this weight as W2.Transfer the entire contents of thesyringe into the aluminum dish.Reweigh the empty syringe to0.1 mg and record as W3.In the case of ultrafiltrate clear liquidsor of low solids paints,increase the specimen size to 5 mL andpreheat at 60C for 2 h.Duplicate this step with the secondaluminum dish(8.1).8.3 Add a few millilitres of water to the specimen in thealuminum dishes prior to placing them in the oven.Thisfacilitates uniform spreading of the material.Place the dishesin the 110C ov