ASTM_D_1712_-_09_2014.pdf

Designation:D171209(Reapproved 2014)Standard Practice forResistance of Plastics to Sulfide Staining1This standard is issued under the fixed designation D1712;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 practice covers the determination of the resistanceof plastics to staining in the presence of sulfides.1.2 The values stated in SI units are to be regarded as thestandard.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.For specificprecaution statements,see Section 6.NOTE1There is no known ISO equivalent to this standard.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to Plastics3.Terminology3.1 Definitions:For definitions of terms used in thispractice,refer to Terminology D883.4.Significance and Use4.1 Plastic compositions containing salts of lead,cadmium,copper,antimony,and certain other metals(as stabilizers,pigments,driers,or fillers)may stain due to the formation of ametallic sulfide when in contact with external materials thatcontain sulfide.The external sulfide source may be liquid,solid,or gas.Examples of materials that may cause sulfidestains are rubber,industrial fumes,foods,kraft paper,etc.Thispractice provides a means of estimating the relative suscepti-bility of plastic composition to sulfide staining.5.Reagent5.1 Hydrogen Sulfide SolutionA freshly prepared satu-rated solution of hydrogen sulfide(Caution,see Section 6).Prepare the solution by rapidly bubbling hydrogen sulfide gas(Note 2)through water.Five minutes of bubbling is sufficientfor 100 to 150 mL of water at room temperature(approxi-mately 23C).NOTE2Hydrogen sulfide gas may be obtained commercially ascompressed gas in cylinders.6.Precautions6.1 Hydrogen sulfide is a highly toxic gas and must behandled only in a suitably ventilated area such as a hood.Avoidbreathing of vapors.7.Sampling7.1 Sampling shall be in accordance with the pertinentmaterial specification or as agreed to by customer and client.8.Test Specimens8.1 Test specimens shall be representative of the particularplastic composition being tested.Size and shape of testspecimens are relatively unimportant.Specimens 100 6 25mm(4 6 1 in.)in length by 13 6 6 mm(0.5 6 0.25 in.)inwidth by the thickness of the composition being tested,havebeen found suitable for this test.9.Conditioning9.1 ConditioningCondition the test specimens at 23 62C(73.4 6 3.6F)and 50 6 10%relative humidity for notless than 40 h prior to test in accordance with Procedure A ofPractice D618 for those tests where conditioning is required.Incases of disagreement,the tolerances shall be 61C(61.8F)and 65%relative humidity.9.2 Test ConditionsConduct tests in the standard labora-tory atmosphere of 23 6 2C(73.4 6 3.6F)and 50 6 10%relative humidity,unless otherwise specified in the test meth-ods or in this specification.In cases of disagreements,thetolerances shall be 61C(61.8F)and 65%relative humid-ity.10.Procedure10.1 Using a 250-mL beaker or equivalent,immerse ap-proximately half of each specimen(Note 3)in the saturated1This practice is under the jurisdiction ofASTM Committee D20 on Plastics andis the direct responsibility of Subcommittee D20.50 on Durability of Plastics.Current edition approved May 1,2014.Published May 2014.Originallyapproved in 1960.Last previous edition approved in 2009 as D1712 09.DOI:10.1520/D1712-09R14.2For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 hydrogen sulfide solution for 15 min(Note 4).Cover the testcontainer with a watch glass or aluminum foil during the test.NOTE3It is recommended that a control material,whose tendency tosulfide stain is known,be included with each test series.This provides areference point from series to series.Staining may be rated as more,less,or equal to that of the control.NOTE4If desired,additional specimens may be tested for differentperiods of time.Suggested periods of immersion are 5,15,30,60,and 120min.If immersion times greater than 30 min are desired,remove thespecimens from the reagent each 30 min and again bubble hydrogensulfide gas through the solution for 3 min.Reimmerse the specimens andcontinue the test.Do not dry the specimens during the t