ASTM_D_1823_-_95_2009.pdf

Designation:D182395(Reapproved 2009)Standard Test Method forApparent Viscosity of Plastisols and Organosols at HighShear Rates by Extrusion Viscometer1This standard is issued under the fixed designation D1823;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 covers the measurement of plastisoland organosol viscosity at high shear rates by means of anextrusion viscometer.1.2 Apparent viscosity at low shear rates is covered in TestMethod D1824.1.3 The values stated in SI units are to be regarded asstandard.The values in parentheses are given for informationonly.1.4This standard does not purport to address the safetyconcerns associated with its use.It is the responsibility of theuser of this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.NOTE1This test method resembles ISO 4575-1985 in title only.Thecontent is significantly different.2.Referenced Documents2.1 ASTM Standards:2D1475 Test Method For Density of Liquid Coatings,Inks,and Related ProductsD1755 Specification for Poly(Vinyl Chloride)ResinsD1824 Test Method for Apparent Viscosity of Plastisols andOrganosols at Low Shear RatesE1 Specification for ASTM Liquid-in-Glass ThermometersE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Standard:ISO 4575-1985PolyVinylChloridePastesDetermination of Apparent Viscosity Using the SeversRheometer33.Summary of Test Method3.1 The sample is conditioned to the proper temperature,placed into an extrusion chamber,and extruded under standardconditions.The viscosity is calculated from the extrusionpressure and the rate of flow through the orifice.4.Significance and Use4.1 The suitability of a dispersion resin for any givenapplication is dependent upon its viscosity characteristics.4.2 The extrusion viscosity defines the flow behavior of aplastisol or organosol under high shear.This viscosity relates tothe conditions encountered in mixing,pumping,knife coating,roller coating,and spraying processes.5.Apparatus5.1 Extrusion Rheometer.45.2 Orifice,3.17 6 0.13 mm(0.125 6 0.005 in.)insidediameter and 50 6 1.0 mm(1.97 6 0.04 in.)long.5.3 Sample Containers,Tin Cans,or Glass Jars,1-pt(500-mL)capacity.5.4 Paper Cups,8-oz(250-mL)capacity.5.5 Nitrogen Cylinder,equipped with pressure regulator andgage.5.6 ThermometerASTM Solvents Distillation Thermom-eter having a range from 2 to+52C(28 to 126F)and1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.15 on Thermoplastic Materials(Section D20.15.08).Current edition approved Oct.1,2009.Published January 2010.Originallyapproved in 1961.Last previous edition approved in 2001 as D1823 95(2001).DOI:10.1520/D1823-95R09.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4The sole source of supply of the Burrell Severs,Model A-120 known to thecommittee at this time is Burrell Corp.,2223 Fifth Ave.,Pittsburgh,PA 15219.Ifyou are aware of alternative suppliers,please provide this information to ASTMInternational Headquarters.Your comments will receive careful consideration at ameeting of the responsible technical committee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 conforming to the requirements for Thermometer 37C asprescribed in Specification E1.Use of temperature measuringdevices such as liquid-in-glass thermometers,thermocouples,or platinum resistance thermometers having equivalent orbetter accuracy and precision,while covering the temperaturerange of Thermometer 37C shall be permitted.5.7 Timer.6.Conditioning6.1 Maintain the plastisol or organosol samples at 236 1C(73 6 2 F)and 50 6 5%relative humidity at all times aftermixing and throughout the period of viscosity determinations.7.Procedure7.1 Set Up RheometerAttach the pressure regulator to thenitrogen tank.Connect the nitrogen supply to the rheometer bymeans of the copper tubing.Do not use oxygen or liquidpressure sources(Note 2).Set the three-way quick-acting valveto the IN position.Regulate the tank pressure to give 1.04 MPa(150 psi)pressure to the instrument.Do not use input or linepressure over 1.38 MPa(200 psi).Insert the medium-sizeorifice(approximately 3.2 mm(18in.)inside diameter)in theorifice retaining cap,with the orifice and the barrel,then screwthe cap solidly in plac