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5.Procedure
5.1Assemble apparatus per Figure 1 and place under fume hood.
5.2Insert test specimen into tube B.
5.3Add approximately 50 mL of tap water to tube A.  Insert cotton packing per Figure 1.  Stopper tubes A and B.
FIGURE 1—STAINING TEST DIAGRAM
5.4Remove pinch clamp from exhaust hose of tube B and cautiously open the valve on the hydrogen sulfide
cylinder.  Adjust the valve so hydrogen sulfide gas bubbles through the system at a uniform and controlled rate, with a steady flow of bubbles at 5 bubbles/second.
5.5Allow the system to purge for 1.5 min, then close the valve and immediately replace the pinch clamp on the
exhaust hose of tube B.
5.6Allow the system to remain in the closed position for an additional 2 min.
5.7Remove the stopper of tube B and take out the test specimen.
5.8Compare the test specimen with an unexposed specimen of the same material and report any discoloration
which has occurred using as a reference staining grey scale.  (Grey Scale for Color Change, AATTC Evaluation Procedure 1, similar to ISO 105-A02.)
6.Notes
6.1Marginal Indicia—The change bar (l) located in the left margin is for the convenience of the user in locating
areas where technical revisions have been made to the previous issue of the report.  An (R) symbol to the left of the document title indicates a complete revision of the report.
PREPARED BY THE SAE TEXTILES AND FLEXIBLE PLASTICS COMMITTEE
Rationale—Not applicable.
Relationship of SAE Standard to ISO Standard—Not applicable.
Application—This SAE Recommended Practice is designed to reveal discoloration which may occur when nonmetallic materials used for trimming automobiles are exposed for a limited time to an atmosphere containing hydrogen sulfide.
NOTE 1—Hydrogen sulfide gas is extremely hazardous.  Use of this substance may be fatal if proper precautions are not taken.  This test method does not purport to address all of the safety
problems associated with its use.  It is the responsibility of the user of this document to
establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
NOTE 2—A fumehood and adequate ventilation should be provided at all times during testing. Reference Section—There are no referenced publications specified herein.
Developed by the SAE Textiles and Flexible Plastics Committee

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