1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Changes 2015 06 19 N Status No usage or replacement G. Weber, NA 1999 04 29 Activated D. Drobnich WP 3948-a Page 1 of 2 CORROSION PROTECTIVE COATING, PETROLEUM TYPE, WSS-M21P32-A SEALER COMPOUND NOT TO BE USED FOR NEW
2、 DESIGN 1. SCOPE This specification defines the material and performance criteria of a corrosion-protective and torque-tension enhancing coating consisting of a limited mobile, water emulsifiable sealer. The sealer can be applied over a variety of different substrates which include zinc phosphate, p
3、ainted surfaces, and stainless steel. 2. APPLICATION This specification was released originally as a secondary sealer over electro-deposition coatings or zinc/iron phosphate to improve corrosion protection and/or torque-tension characteristics. It is intended for use in body interior application whe
4、re a dry to the touch and plastics compatible finish is required. It can also be used to improved drive torque of thread forming screws and lubricity of threaded fasteners where torque-tension is a concern. 3. REQUIREMENTS 3.1 QUALITY SYSTEM REQUIREMENTS Material suppliers and part producers must co
5、nform to Quality System Requirements, QS-9000. Material specification requirements are to be used for initial qualification of materials. A Control Plan for ongoing production verification is required. This plan must be reviewed and approved by the relevant Ford Materials activity and/or Ford Suppli
6、er Technical Assistance (STA) prior to production parts submission. Appropriate statistical tools must be used to analyze process/product data and assure consistent processing of the materials. Part producers using this material in their products, must use Ford approved materials and must conform to
7、 a process control plan which has been approved by STA and/or the relevant Materials Activity. 3.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSIS Ford Motor Company, at its option, may conduct infrared and/or thermal analysis of material/parts supplied to this specification. The IR spectra and t
8、hermograms established for initial approval shall constitute the reference standard and shall be kept on file at the designated material laboratory. All samples shall produce IR spectra and thermograms that correspond to the reference standard when tested under the same conditions. ENGINEERING MATER
9、IAL SPECIFICATION WSS-M21P32-A WP 3948-b Page 2 of 2 3.3 APPEARANCE Unless otherwise specified, the color of the protective sealer described herein will not change the original substrate. 3.4 COATING THICKNESS Coating in threads and recess areas, such as nuts, and screw heads shall have no adverse e
10、ffect on normal installation. 3.5 COATING Parts must be free from die lubricants and drawing compounds that will adversely affect the sealer. 3.6 ADHESION The coating shall withstand normal handling, storage and installation without loss of adhesion. 3.7 CORROSION RESISTANCE 72 h min (SAE/USCAR-1) 3
11、.8 SUPPLIERS RESPONSIBILITY All materials supplied to this specification must be equivalent in all characteristics to the material upon which approval was originally granted. Prior to making any change in the properties, composition, construction, color, processing or labeling of the material origin
12、ally approved under this specification, whether or not such changes affect the materials ability to meet the specification requirements, the Supplier shall notify Purchasing, Toxicology and the affected Materials Engineering activity of the proposed changes and obtain the written approval of the Mat
13、erials Engineering activity. Test data, test samples and a new code identification are to be submitted with the request. Substance restrictions imposed by law, regulations or Ford, apply to the materials addressed by this document. The regulations are defined in Engineering Materials Specification W
14、SS-M99P9999-A1. 4. APPROVAL OF MATERIALS Materials defined by this specification must have prior approval by the responsible Materials Engineering activity. Suppliers desiring approval of their materials shall first obtain an expression of interest from the affected Purchasing, Design and Materials
15、Engineering activity. Upon request, the Supplier shall submit to the affected Materials Engineering activity a completed copy of their laboratory test reports, signed by a qualified and authorized representative of the test facility, demonstrating full compliance with all the requirements of this sp
16、ecification (test results, not nominal values), the material designation and code number, and test specimens for Ford evaluation. Fords engineering approval of a material will be based on its performance to this specification and on an assessment of suitability for intended processes and/or applications. Upon approval, the material will be added to the Engineering Material Approved Source List.
