1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14864 Procedure for Determining the Staining of Trim Materials Due to Sulfur Dioxide, SO2, and Hydrogen Sulfide, H2S Copyright 2012 General Motors Company All Rights Reserved September 2012 Originating Department: North American Engineering Standard
2、s Page 1 of 3 1 Scope Note: Nothing in this standard supercedes applicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. This standard defines the standards to be adopted for determining the re
3、sistance to staining of trim material due to sulfur dioxide and hydrogen sulfide. 1.2 Foreword. Not applicable. 1.3 Applicability. All trim materials 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM St
4、andards/Specifications. None 3 Resources 3.1 Facilities. Not applicable. 3.2 Equipment. 3.2.1 Burette, pipette, separator funnel, volumetric flasks, analytical balance, dropper or apparatus which provide test solution dripping (4 units). 3.2.2 Absorbing paper. 3.2.3 Chronometer or watch. 3.2.4 Cutti
5、ng die or scissors for test specimen preparation. 3.2.5 Saturated Sodium Sulfite Solution. Prepare the solution by adding 30 g (minimum) of Sodium Sulfite, Na2SO3, to 100 mL of distilled water. The presence of salt crystals indicates a saturated solution. 3.2.6 Dilute Sulfuric Acid Solution. Prepare
6、 the solution by adding 25 mL of concentrated Sulfuric Acid, H2SO4, 96%, to 75 mL of distilled water. 3.2.7 Use a 1% solution of Hydrochloric Acid (HCl). 3.2.8 Potassium Sulfide Solution. Prepare the solution by adding 1.0 g 0.1 g of Potassium Sulfide, K2S, to 100 mL of distilled water. 3.3 Test Veh
7、icle/Test Piece. Not applicable. 3.4 Test Time. Calendar time: 2 days Test hours: 1 hour Coordination hours: 24 hours 3.5 Test Required Information. Not applicable. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking p
8、ermitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14864 Copyright 2012 General Motors Company All Rights Reserved September 2012 Page 2 of 3 3.6 Personnel/Skills. Not applicable. 4 Procedure 4.1 Preparation. 4.1.1 Cut one specimen for each solution for a total of two specim
9、ens. 4.1.2 The dimensions of the specimen shall be 100 mm x 100 mm. 4.2 Conditions. 4.2.1 Environmental Conditions. Not applicable. 4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test c
10、ertificates, reports, etc. 4.3 Instructions. 4.3.1 Staining Due to SO2. 4.3.1.1 Pour one drop of sodium sulfide solution on the test specimen surface by using a dropper, pipette or similar device. 4.3.1.2 With another dropper (or pipette, etc.), add one drop of H2SO4 solution over the drop of Na2SO3
11、. 4.3.1.3 Allow solution to remain on sample for 25 minutes. 4.3.1.4 Dry the test specimen surface using absorbing paper. 4.3.2 Staining Due to H2S. 4.3.2.1 Pour one drop of HCl solution on the test specimen surface by using a dropper, pipette or similar device. 4.3.2.2 With another dropper (or pipe
12、tte, etc.), add one drop of K2S solution over the drop of HCl. 4.3.2.3 Allow solution to remain on sample for 10 s. 4.3.2.4 Dry the test specimen surface using absorbing paper. 4.3.3 After test conclusion, the test specimen shall be evaluated for color changes and other deleterious effects. 5 Data 5
13、.1 Calculations. Not applicable. 5.2 Interpretation of Results. Evaluate for color changes and other deleterious effects in accordance with the material specification. 5.3 Test Documentation. Document in accordance with the material specification. 6 Safety This standard may involve hazardous materia
14、ls, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
15、 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. H2S Hydrogen Sulfide H2SO4 Sulfuric Acid HCI Hydrochloric Acid K2S Potassium Sulfide Na2SO3 Sodium Sulfite SO2 Sulfur Dioxide Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot
16、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14864 Copyright 2012 General Motors Company All Rights Reserved September 2012 Page 3 of 3 8 Coding System This standard shall be referenced in other documents, drawings, etc., as fo
17、llows: Test to GMW14864 9 Release and Revisions This standard was originated in November 2005. It was first approved by the Global Textiles Development Group in May 2005. It was first published in November 2005. Issue Publication Date Description (Organization) 1 NOV 2005 Initial publication. 2 JUL
18、2007 Addition of paragraphs 3.2.5 to 3.2.8. Additions to sections 3.1 and 6. Correction in paragraph 5.3.1.2, H2SO4 instead of H2SO. (Global Textile Development Group) 3 SEP 2012 Five year refresh of standard. (Textiles & Trim Materials Global Subsystem Leadership Team) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
