1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions 2007 01 17 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.9, 3.10, 4 1998 12 07 Activated M. Masserant L. Soreide Printed copies are uncontrolled Copyright 2007, Ford Global Technologies, LLC Page 1 of 4 COATING, POWDERED, THERMOPLASTIC NYLON
2、 WSS-M4D240-A2 (TYPE 11 OR 12) 1. SCOPE This specification defines the material requirements for thermoplastic nylon (Type 11 or 12) powder coatings applied electrostatically, in a fluidized bed, or a variation thereof. A primer may be required to meet the performance requirements of this specificat
3、ion. Two types of nylon coating are covered by this specification, as follows: Type I - Thick Nylon 11 or Nylon 12 coating used on parts which are susceptible to high wear. Type II - Thin Nylon 11 or Nylon 12 coating. 2. APPLICATION This specification was released originally for fasteners to prevent
4、 metal-to-metal contact and provide wear resistance. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.4 APPEARANCE 3.4.1 General The coating shall e
5、xhibit no craters, pinholes, solvent popping, seediness, abnormal roughness, or excessive flow. 3.5 FILM PROPERTIES Testing shall be performed on parts or representative test plaques. Test plaques shall be used for material qualification only. 3.5.1 Film Thickness, range (ASTM B 487 or other mutuall
6、y agreed upon method) Type I 0.38 +/- 0.12 mm Type II 0.15 +/- 0.08 mm 3.5.2 Paint Adhesion Grade 0 (FLTM BI 106-01, Method B) No flaking or chipping of the coating. ENGINEERING MATERIAL SPECIFICATION WSS-M4D240-A2 Printed copies are uncontrolled Copyright 2007, Ford Global Technologies, LLC Page 2
7、of 4 3.5.3 Condensing Water Vapor Test (FLTM BI 104-02) 3.5.3.1 Suffix Codes EX and EX/UV. After 96 hours of exposure there shall be no blistering or appearance change. On parts large enough to receive the specified scribe in para 3.5.2, there shall be no more than 1.5 mm peelback from intersection
8、of scribed lines. No peeling shall occur elsewhere in the taped area. 3.5.3.2 Suffix Codes IN and IN/UV. After 24 hours exposure there shall be no blistering or appearance change. On parts large enough to receive the specified scribe in para 3.5.2, there shall be no more than 1.5 mm peelback from in
9、tersection of scribed lines. No peeling shall occur elsewhere in the taped area. 3.5.4 Neutral Salt Spray (ASTM B117) 3.5.4.1 Suffix Code EX. There shall be no more than 10% blistering or peeling of the powder coating after 168 hours. 3.5.4.2 Suffix Code EX/UV. There shall be no more than 10% bliste
10、ring or peeling of the powder coating after 336 hours. 3.5.5 Environmental Resistance After exposure and impact per the procedure below the coating must show no chipping cracking blistering, softening effect on adjacent materials (effect on corrosion resistance of the metal, staining, etc., objectio
11、nable change in color or other detrimental effects (mushrooming without cracking when impacted is acceptable). Environmental Resistance/Impact - parts shall be subjected to the following cycle then impacted: . 2 h at 82 +/- 2 C . 1 h at 20 +/- 2 C . 3 h at 45 +/- 2 C and 85 +/- 5% R.H. . 2 h at -20
12、+/- 2 C . 1 h at 0 +/- 2 C . 4 h at -40 +/- 2 C . 1 h at 0 +/- 2 C . 2 h at -20 +/- 2 C . 3 h at 45 +/- 2 C and 85 +/- 5% R.H. . 1 h at 20 +/- 2 C . 4 h at 82 +/- 2 C . 1 h at 20 +/- 2 C . 3 h at 45 +/- 2 C and 85 +/- 5% R.H. . 2 h at -20 +/- 2 C . 1 h at 0 +/- 2 C . 2 h at -40 +/- 2 C 1 h ramp time
13、 between each step. Appearance Evaluation: No evidence of cracks, no blistering, no change in appearance or other failure when compared with original unaged test sample. ENGINEERING MATERIAL SPECIFICATION WSS-M4D240-A2 Printed copies are uncontrolled Copyright 2007, Ford Global Technologies, LLC Pag
14、e 3 of 4 Impact shall be conducted at -30 C +/- 2 C from a height of 50 mm utilizing an impact head with the following dimensions: 0.5 +/- 0.05 kg, 25 mm long with a 3.2 mm radius. Samples shall be impacted across the edge of the part. 3.5.6 Abrasion Resistance, min 1000 cycles (SAE J948, Taber meth
15、od, 500 g load, CS-17 wheels) Abrasion resistance shall be determined on test panels with smooth surface. Plaques shall be subjected to 1000 cycles. Weight loss shall be 0.04 g max. 3.5.7 Resistance to Fade-Interior, min Rating 4 Suffix IN/UV only, (SAE J1885, ISO 105 A-02/AATCC Evaluation Procedure
16、 1, 601 KJ/sq m) Expose two panels approximately 60 x 150 mm with 1/3 area protected from exposure. After the color and gloss measurements, one of the weathered panels shall be subjected to the condensing water vapor test for 24 h per para 3.5.3.2 and evaluated for blistering, softening, dulling, co
17、lor change or loss of adhesion per para 3.5.2 within 30 minutes of removal from water. 3.5.8 Resistance to Cleaning Agents, max Rating 4 discoloration (FLTM BN 107-01, 10 cycles, AATCC Evaluation Procedure 2) Test Procedure: Saturate white cotton cloth with the cleaners listed. Evaluation according
18、to the AATCC Scale. Cleaners (see also para 5.1) 1) Deionized water 2) Window cleaner with ammonia 3) All purpose cleaner 4) Dry (no cleaners or water) 3.5.9 Resistance to Fade-Exterior, min Rating 4 Suffix Code EX/UV only, (SAE J1960, ISO 105 A-02/AATCC Evaluation Procedure 1, 2500 KJ/sq m) Expose
19、two panels approximately 60 x 150 mm with 1/3 area protected from exposure. After the color and gloss measurements, one of the weathered panels shall be subjected to the condensing water vapor test for 24 h per para 3.5.3.1 and evaluated for blistering, softening, dulling, color change or loss of ad
20、hesion per para 3.5.2 within 30 minutes of removal from water. 3.6 FOGGING (Suffix Code IN, INUV) (SAE J1756, 3 h at 100 C heating, 21 C cooling plate, post test conditioning 1 h and 16 h) Fog Number, min 70 Formation of clear film, droplets or crystals is cause for rejection. ENGINEERING MATERIAL S
21、PECIFICATION WSS-M4D240-A2 Printed copies are uncontrolled Copyright 2007, Ford Global Technologies, LLC Page 4 of 4 3.7 FLAMMABILITY (ISO 3795) Burn Rate, max 100 mm/minute The specimen size required for material approval is 355 x 100 x 0.8 +/- 0.1 mm with a smooth surface. 3.8 EXPLOSION HAZARD The
22、se materials should be used in a closed system specifically designed for their use because of the possibility of dust explosion present in powdered materials. 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 CLEANING AGENTS (See para 3.5.8) 1) Window cleaner with ammonia E4AZ-19C507-AA* 2) All Purpose Cleaner E0AZ-19526-AA* *or Ford Motor Company Recommended Equivalents 5.2 RECYCLING CODE PA11
