1、Designation: D1712 09Standard 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
2、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 covers the determination of the resistanceof plastics to staining in the presence of sulfides.1.2 The values stated in SI units ar
3、e 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 limitati
4、ons prior to use. For specificprecaution statements, see Section 6.NOTE 1There 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
5、 of terms used in this prac-tice, 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 w
6、ith 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 compositi
7、on 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 r
8、oom temperature (approxi-mately 23C).NOTE 2Hydrogen 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 sh
9、all 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
10、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 acco
11、rdance 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 humidi
12、ty, 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.1This practice is under the jurisdiction ofASTM Committee D20 on Plastics andis the direct responsibility of Subcommittee D20.50 on
13、Durability of Plastics.Current edition approved Nov. 1, 2009. Published December 2009. Originallyapproved in 1960. Last previous edition approved in 2003 as D1712 03. DOI:10.1520/D1712-09.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at service
14、astm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United
15、 States.10. Procedure10.1 Using a 250-mL beaker or equivalent, immerse ap-proximately half of each specimen (Note 3) in the saturatedhydrogen sulfide solution for 15 min (Note 4). Cover the testcontainer with a watch glass or aluminum foil during the test.NOTE 3It is recommended that a control mater
16、ial, 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.NOTE 4If desired, additional specimens may be tested for differentperiods of time. Suggested peri
17、ods 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
18、time they areremoved for reconcentration of the solution. Time compensation will notbe necessary for the period the specimens are not immersed.10.2 After immersion for 15 min, remove the specimens,wipe dry, and examine for discoloration of the immersedsection compared to a sample of the identical pl
19、astic compo-sition not exposed to hydrogen sulfide solution.10.3 Compare the relative degree of staining for eachmaterial being tested in a series, and establish their relativeorder of sulfide stain resistance.11. Report11.1 The report shall include the following:11.1.1 Complete identification of th
20、e material tested, includ-ing type, source, manufacturers code numbers, form, previoushistory, and other pertinent information,11.1.2 Duration of exposure, and11.1.3 Effects of exposure, including whether or not stainingoccurred, color of stain, and severity of staining in relation toother materials
21、 in the series or in relation to a control material,if included.12. Precision and Bias12.1 Since the results of this practice are subjective descrip-tions, statements of precision and bias are not pertinent to thepractice.13. Keywords13.1 hydrogen sulfide; staining; sulfideSUMMARY OF CHANGESCommitte
22、e D20 has identified the location of selected changes to this standard since the last issue (D1712 - 03)that may impact the use of this standard. (November 1, 2009)(1) Revised 9.1 and 9.2 to change tolerance on % RHrequirement to align with the new version of Test MethodD618.(2) Editorially revised
23、Note 1.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such righ
24、ts, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional
25、standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM
26、Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D1712 092
