1、Designation:D238314Standard Practice forTesting Plasticizer Compatibility in Poly(Vinyl Chloride)(PVC)Compounds Under Humid Conditions1This standard is issued under the fixed designation D2383;the number immediately following the designation indicates the year oforiginal adoption or,in the case of r
2、evision,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 practice defines the conditions for the exposure andqualitative evaluation of poly(vinyl chloride
3、)(PVC)com-pounds for plasticizer compatibility under humid conditions.Change in appearance is used for judging compatibility.1.2 The text of this practice references notes and footnotesthat provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be cons
4、ideredas requirements of this practice.1.3 The values stated in SI units are to be regarded asstandard.1.4 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 heal
5、th practices and determine the applica-bility of regulatory limitations prior to use.NOTE1There is no known ISO equivalent to this practice.2.Referenced Documents2.1 ASTM Standards:2D883 Terminology Relating to PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD1755 Specification f
6、or Poly(Vinyl Chloride)ResinsE145 Specification for Gravity-Convection and Forced-Ventilation Ovens3.Terminology3.1 GeneralDefinitions are in accordance with Terminol-ogy D883 and abbreviations with Terminology D1600,unlessotherwise indicated.4.Summary of Practice4.1 Specimens are suspended over wat
7、er in closed contain-ers and aged at either 60C or 80C.The specimens areremoved from the containers at specified intervals and theirappearance is rated in accordance with 10.1 and recorded.5.Significance and Use5.1 This practice provides an accelerated method for deter-mining the stability of PVC co
8、mpounds with respect toplasticizer compatibility under humid conditions.5.2 The temperatures and humidity employed in this test canrepresent actual use conditions,but are intended primarily forrating materials.6.Apparatus6.1 Screw-Cap Glass Jars or Capped Metal Containers,large enough to avoid conta
9、ct between specimens and betweenthe specimens and 1 cm of deionized water.The covers shall beprovided on the inside with hooks of a corrosion-resistantmetal such as stainless steel,nichrome or nickel.6.2 Forced-Ventilation Laboratory Oven,Type II,Grade A,in accordance with Specification E145.7.Mater
10、ials7.1 Distilled WaterFreshly prepared distilled or deionizedwater.8.Specimen Preparation(Note 2)8.1 Cut test specimens with one side having a surface areaof 25 cm2from a 0.5-mm(0.02-in.)thick smooth surfaceplastic sheet(60.05 mm(0.002-in.)Punch a small hole nearthe edge for hanging the specimen.1T
11、his practice is under the jurisdiction ofASTM Committee D20 on Plastics andis the direct responsibility of Subcommittee D20.15 on Thermoplastic Materials(Section D20.15.07).Current edition approved March 1,2014.Published March 2014.Originallyapproved in 1969.Last previous edition approved in 2009 as
12、 D2383-09.DOI:10.1520/D2383-14.2For 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 appea
13、rs at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NOTE2For use as a control in testing the relative performance ofplasticizers,the following clear formulation may be employed.PartsGeneral-Purpose PVC Resin:Type
14、 GP 40000 as defined in Specification D1755.100Plasticizer:Di-2-ethylhexyl phthalate50Stabilizer:Weatherable BaZn1NOTE3The test compound suggested in Note 2 will not exude undereither test temperature specified in 9.2.9.Procedure9.1 Suspend the specimens from hooks over 1-1.3 cm ofdistilled water in
15、 closed containers so that they do not touch thewater layer,sides of the container,or each other.9.2 Place the containers in the circulating-air oven(see 6.2)at either 60 6 1C or 80 6 1C,depending upon whichtemperature is specified in the applicable material specifica-tion.Put covers on loosely unti
16、l the containers come totemperature equilibrium,then tighten covers.9.3 Remove the containers from the oven at specifiedintervals.Under normal inspection,the intervals for plasticizedPVC are:9.3.1 At 60C,once a week for a total of 4 weeks.9.3.2 At 80C,1,3,7,10,and 14 days.9.4 After allowing to dry,examine the specimens forevidence of exudation and record their appearance.9.5 Replace the specimens in the original containers andcontinue the test for the specified period of time.10.Ratings10.1 The