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 2009, Ford Global Technologies, LLC Page 1 of 4 ELECTRICAL GREASE PERFORMANCE WSS-M13P14-A 1. SCOPE This spec
2、ification defines the requirements for approval of grease used in electrical applications. 2. APPLICATION This performance specification was originally released for electrical switches, connectors, spark plug wire sets, wire harnesses and other electrical related applications. 2.1 LIMITATIONS Limita
3、tions relative to the application of this grease must be listed in Supplement A Part 3 of the Data Submission Spreadsheet. Sulfur containing greases should not be used in contact with silver alloy or inks. 3. REQUIREMENTS Material performance requirements per paragraph 3.3 are to be submitted for qu
4、alification of materials. Additional 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 pro
5、ducers must conform to the Companys 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
6、Engineering. Results shall be made 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
7、cycles Report Worked 100,000 cycles, max +/- 15% change from 60 cycle result 3.3.2 Oxidation Stability, kPa (ASTM D 942 or DIN 51808, 100 hr at 99 C) Report ENGINEERING MATERIAL SPECIFICATIONWSS-M13P14-A Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 2 of 4 3.3.3
8、Dropping Point, C, min 130 (ASTM D 566 or ASTM D 2265, DIN ISO 2176) 3.3.4 Water Spray-Off, max 25% (ASTM D 4049, 5 min at 38 C) 3.3.5 Interface Compatibility Production representative materials specific to the application should be used for the following tests. 3.3.5.1 Chemical Attack to Painted Su
9、rfaces (FLTM BJ 126-01) No staining or softening of automotive finishes. Note: Include chemical attack test when used in contact with paint surfaces. 3.3.5.2 Resistance to Stress Cracking No cracking or crazing (FLTM BO 127-03) Note: Include resistance to stress cracking when used in contact with po
10、lymers such as PC, ABS, PC+ABS, ASA or acrylic. 3.3.5.3 Elastomer Compatibility (ASTM D 4289, DIN 53505, DIN 53504 70 h, 100 C) Volume change 0 to 30% Hardness change, max -30% to 0 Tensile Strength change, Report % Note: Include elastomer compatibility when used in contact with elastomeric material
11、s. Application specific elastomer should be used for testing instead of a reference elastomer. 3.3.6 Oil Separation, max 10% (ASTM D 1742 or Federal Standard 791C, Method 321.3, DIN 51817) 3.3.7 Copper Corrosion, max 1B (ASTM D 4048, 24 h, 100 C) 3.4 INFORMATION TO INCLUDE ON DRAWING The following c
12、all-out information must be included on any engineering component/assembly drawing that specifies grease. Option A is the preferred method. Use Option B in special circumstances, when the grease product information is considered proprietary. Option B must be reviewed and concurred by Materials Engin
13、eering. Option A (preferred method) WSS-M13P14-A Supplier: _ Product Code: _ Trade Name: _ ENGINEERING MATERIAL SPECIFICATIONWSS-M13P14-A Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 3 of 4 Option B WSS-M13P14-A Record ID: _ 4. GENERAL INFORMATION Grease Life Es
14、timation Report Line Equation & Test Temperature (ASTM E 1858, Method B) For 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 OIT data, plot the log (OIT) vs. (1/T), where: O
15、IT = Oxidation Induction Time in minutes T = PDSC 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 Engineering if other test temperatures are desired. 5
16、. SUMMARY OF REVISIONS 2009 01 08 Added DIN ISO 2137, DIN 51808, DIN ISO 2176, DIN 53505, DIN 53504, DIN 51817 Added Tensile Strength change to Elastomer Compatibility Moved Grease Life Estimation to General Info. Removed Method A (DSC) for Grease Life Estimation ENGINEERING MATERIAL SPECIFICATIONWS
17、S-M13P14-A Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 4 of 4 APPENDIX 1 Grease Life Estimation Example Determine the Oxidation Induction Time (OIT) for grease at the service temperatures of 70 C and 100 C. Per ASTM E 1858 Method B, the following data was colle
18、cted: 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 and equation: Using the calculated equation, determine the OIT for T = 100 C = 373 K, Log (OIT) = 6464.1 * (1/T) 12.1
19、78 Log (OIT) = 6464.1 * (1/373) 12.178 OIT = 141915 minutes = 100 days Obviously 100 days would not be a 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, Lo
20、g (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. y = 6464.1x - 12.178 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0.00210 0.00215 0.00220 0.00225 0.00230 0.00235 0.00240 (1/T) deg Klog
