1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 01 08 Revised See summary of revisions L. Schmalz, FNA 2007 10 11 Activated L. Schmalz Printed copies are uncontrolled Copyright 2008, Ford Global Technologies, LLC Page 1 of 5 CHASSIS AND UNDERHOOD GREASE PERFORMANCE WSS-M13P13-A 1. SCOP
2、E This specification defines the requirements for approval of grease used in chassis and underhood applications. 2. APPLICATION This performance specification was originally released for chassis wheel bearings, ball joints, axels, calipers, glide rails wheel pilot holes, universal joints, CV joints,
3、 and general chassis related applications. 2.1 LIMITATIONS Limitations relative to the application of this grease must be listed in Supplement A, Part 3 of the Data Submission Spreadsheet. 3. REQUIREMENTS Material performance requirements are to be submitted for qualification of materials. Additiona
4、l data for specific applications must be submitted in Supplement B of the Data Submission Spreadsheet. Contact the appropriate materials engineer to obtain a copy of the spreadsheet. 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys
5、 Standard Requirements for Production Materials (WSS-M99P1111-A). 3.2 FUNCTIONAL TRIAL Materials being evaluated to this specification shall be subjected to a functional trial. Functional trial results must be approved by the affected assembly operation and Design Engineering. Results shall be made
6、available to Materials Engineering prior to material approval and release. The design engineer will document the functional trial and supply the information in Supplement A Part 2. 3.3 PERFORMANCE REQUIREMENTS 3.3.1 Penetration (ASTM D 217, DIN ISO 2137) Worked 60 cycles Report Worked 100,000 cycles
7、, max +/- 15% change from 60 cycle result 3.3.2 Oxidation Stability, kPa (ASTM D 942, 100 hr at 99 C, or DIN 51808) Report ENGINEERING MATERIAL SPECIFICATIONWSS-M13P13-A Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 2 of 5 3.3.4 Dropping Point, C, min 130 (ASTM D
8、 566 or ASTM D 2265, DIN ISO 2176) 3.3.5 Water Resistance 3.3.5.1 Water Spray-Off, max 25% (ASTM D 4049, 5 min at 38 C) 3.3.5.2 Water Washout, max 10% (ASTM D 1264, at 38 C, DIN 51807 T02) Note: Select either water spray-off or washout depending on application. 3.3.6 Interface Compatibility Producti
9、on representative materials specific to the application should be used for the following tests. 3.3.6.1 Chemical Attack to Painted Surfaces No staining or softening (FLTM BJ 126-01) of automotive finishes Note: Include chemical attack test when used in contact with paint surfaces, ex. E-coat and pow
10、der coat. 3.3.6.2 Resistance to Stress Cracking (FLTM BO 127-03) No cracking or crazing Note: Include resistance to stress cracking when used in contact with polymers such as PC, ABS, PC+ABS, ASA or acrylic. 3.3.6.3 Elastomer Compatibility (ASTM D 4289, 70 h, 100 C, DIN 53505, DIN 53504) Volume chan
11、ge 0 to 30% Hardness change, max -30% to 0 Tensile Strength change Report % Note: Include elastomer compatibility when used in contact with elastomeric materials. Application specific elastomer should be used for testing instead of a reference elastomer. 3.3.7 Oil Separation, max 10% (ASTM D 1742 or
12、 Federal Standard 791C, Method 321.3, DIN 51817) 3.3.8 Corrosion Resistance, rating Pass (ASTM D 1743) 3.4 INFORMATION TO INCLUDE ON DRAWING The following call-out information must be included on any engineering component/assembly drawing that specifies grease. Option A is the preferred method. Use
13、Option B in special circumstances, when the grease product information is proprietary. ENGINEERING MATERIAL SPECIFICATIONWSS-M13P13-A Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 3 of 5 Option A (preferred method) WSS-M13P13-A Supplier: _ Product Code: _ Trade N
14、ame: _ Option B WSS-M13P13-A Record ID: _ 4. GENERAL INFORMATION Supplied supplemental test data for approved greases will be added to the Ford Materials Database (FMD), which can be accessed by Ford Motor Company employees at . The grease Record ID will be needed to retrieve the data. Contact Mater
15、ials Eng for assistance in using the FMD. 4.1 Grease Life Estimation Report Line Equation & Test Temperature (ASTM E 1858, Method B) Generate OIT data using at least the following PDSC (Pressure Differential Scanning Calorimetry) test temperatures: 200 C, 175 C, 160 C, & 150 C After obtaining the OI
16、T data, plot the log (OIT) vs. (1/T), where: OIT = Oxidation Induction Time in minutes T = DSC test temperature in degrees Kelvin Use a suitable spreadsheet software package (such as Microsoft Excel) to plot and generate the line equation. See Appendix 1 for example. Note: Contact Materials Engineer
17、ing if other test temperatures are desired. 4.2 Tribological Testing 4.2.1 Cameron Plint Testing (Ball Joints Only) (ASTM G 133) Sliding Friction Drag Force (N), max change +/- 25% There are several test parameters that need to be defined concerning the Cameron Plint test machine and specimens, incl
18、uding: Ball Radius and Surface Finish, Substrate Material and Surface Finish, Applied Load, Reciprocating Frequency, Stroke Length, Grease Film Thickness, and Test Duration Contact Materials Engineering or Ball Joint Design Engineering for assistance in defining these parameters. ENGINEERING MATERIA
19、L SPECIFICATIONWSS-M13P13-A Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 4 of 5 4.2.2 Other Tribological Tests Other tribological test methods, such as SRV test, may be used to determine the change in frictional performance of the grease over time. Contact Mater
20、ials Engineering or Ball Joint Design Engineering if another test method is desired. 5. SUMMARY OF REVISIONS 2009 01 08 Added DIN ISO 2137, DIN 51808, DIN ISO 2176, DIN 51807 T02, DIN 53505, DIN 53504, DIN 51817 Added Tensile Strength change to Elastomer Compatibility Moved Grease Life Estimation to
21、 General Info. Removed Method A (DSC) for Grease Life Estimation Deleted Table 1 ENGINEERING MATERIAL SPECIFICATIONWSS-M13P13-A Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 5 of 5 APPENDIX 1 Grease Life Estimation Example Determine the Oxidation Induction Time (
22、OIT) for grease at the service temperatures of 70 C and 100 C. Per ASTM E 1858 Method B, the following data was collected: PDSC Test Temp (C) PDSC Test Temp (K) OIT (min) 200 473 30.4 175 448 180 160 433 578 150 423 1236 Plotting the data and fitting a linear trend line provides the following chart
23、and equation: y = 6464.1x - 12.1780.00.51.01.52.02.53.03.50.002100.002150.002200.002250.002300.002350.00240(1/T)log(OIT)Using the calculated equation, determine the OIT for T = 100 C = 373 K, Log (OIT) = 6464.1 * (1/T) 12.178 Log (OIT) = 6464.1 * (1/373) 12.178 OIT = 141915 minutes = 100 days Obviou
24、sly 100 days would not be sufficient to meet the durability requirements for long term, high mileage applications with a 100 C service temperature. Using the calculated equation, determine the OIT for T = 70 C = 343 K, Log (OIT) = 6464.1 * (1/343) 12.178 OIT = 4653423 minutes = 9 years 9 years would be a sufficient to meet the durability requirements for long term, high mileage applications with a 70 C service temperature.
