1、Designation: D 1712 03Standard Practice forResistance of Plastics to Sulfide Staining1This standard is issued under the fixed designation D 1712; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number i
2、n parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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
3、 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 limit
4、ations prior to use. For specificprecaution statements, see Section 6.NOTE 1There is no equivalent ISO standard.2. Referenced Documents2.1 ASTM Standards:D 618 Practice for Conditioning Plastics for Testing2D 883 Terminology Relating to Plastics23. Terminology3.1 Definitions: For definitions of term
5、s used in this prac-tice, refer to Terminology D 883.4. 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 ext
6、ernal 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 s
7、ulfide 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 tem
8、perature (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 shall be
9、 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
10、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 5 % relative humidity for not lessthan 40 h prior to test in accordance with P
11、rocedure A ofPractice D 618 for those tests where conditioning is required.In cases of disagreement, the tolerances shall be 61C61.8F and 62 % 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 5%relative humidity, unless otherwi
12、se specified in the test meth-ods or in this specification. In cases of disagreements, thetolerances shall be 61C 61.8F and 62 % relative humid-ity.10. Procedure10.1 Using a 250-mL beaker or equivalent, immerse ap-proximately half of each specimen (Note 3) in the saturatedhydrogen sulfide solution f
13、or 15 min (Note 4). Cover the testcontainer with a watch glass or aluminum foil during the test.1This practice is under the jurisdiction of ASTM Committee D20 on Plastics andis the direct responsibility of Subcommittee D20.50 on Durability of Plastics.Current edition approved March 10, 2003. Publish
14、ed April 2003. Originallyapproved in 1960. Last previous edition approved in 1996 as D 1712 96.2Annual Book of ASTM Standards, Vol 08.01.1*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 19428-29
15、59, United States.NOTE 3It 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.NOTE 4If desired, additional specim
16、ens 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 specim
17、ens andcontinue the test. Do not dry the specimens during the 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 o
18、f the immersedsection compared to a sample of the identical plastic 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 sh
19、all include the following:11.1.1 Complete identification of the 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
20、 stain, and severity of staining in relation toother materials 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
21、 hydrogen sulfide; staining; sulfideSUMMARY OF CHANGESThis section identifies the location of selected changes to this practice. For the convenience of the user,Committee D20 has highlighted those changes that may impact the use of this practice. This section may alsoinclude descriptions of the chan
22、ges or reasons for the changes, or both.D 1712 - 03:(1) Removed reference to Practice D 1898 in Section 2 andparagraph 7.1.D 1712 - 96:(1) Added Sections 3 and 13, and paragraph 1.5.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item
23、 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 rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical commi
24、ttee 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 standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a me
25、eting 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 Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive,
26、 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).D1712032
