1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 0 2015 01 22 Released T. Covert, FNA Controlled document at www.MATS Copyright 2015, Ford Global Technologies, LLC Page 1 of 5 SPRAYABLE WEAR RESISTANT COATING, TWO COMPONENT, POLYOL WSS-M99P40-A3 NON-VISIBLE APPLICATIONS SPRAYABLE WEAR
2、RESISTANT COATING, TWO COMPONENT, ISOCYANATE WSS-M99P40-A4 NON-VISIBLE APPLICATIONS 1. SCOPE This specification defines the material and performance of a two component, spray applied elastomeric film, based on a polyol (WSS-M99P40-A3) and an isocyanate hardener (WSS-M99P40-A4) for use on parts that
3、are not exposed to sunlight and require resistance to wear, abrasion, chemicals and stone impact. 2. APPLICATION This specification was released originally to define the performance of a wear resistant, sprayable material applied to painted surfaces that do not experience continuous operating temper
4、atures above 120 C. It is specified for parts that need excellent abrasion, chip, impact and chemical resistance. The material is intended to be used in applications that are not exposed to sunlight after vehicle assembly. The material was initially released for coating the tank side of e-coated fue
5、l tank straps. 2.1 LIMITATIONS The material is not UV (ultra violet light) stable. It is not intended for applications where exposure to direct sunlight will occur. Fastener joint testing is required if this material is applied onto load bearing surfaces. Material creep or loss of clamp load must be
6、 evaluated. 3. REQUIREMENTS Material specification requirements are to be used for initial qualification of materials. 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements for production materials (WSS-M99P1111-A)
7、. 3.2 RHEOLOGY Suppliers must submit flow characterization data to Ford Motor Company for flow modeling and process window determination. For a specified temperature range, the requested properties include, but are not limited to, viscosity, yield stress, apparent activation energy for viscosity and
8、 apparent activation energy for yield stress. This data constitutes the reference standard and shall be kept on file at the designated material laboratory. ENGINEERING MATERIAL SPECIFICATION WSS-M99P40-A3/A4 Copyright 2015, Ford Global Technologies, LLC Page 2 of 5 3.3 COMPOSITION AND CONSISTENCY Th
9、e material is a thermosetting, two-component polyurea elastomer system that provides excellent wear resistance, corrosion resistance, impact resistance and chemical resistance. The material shall be a smooth homogenous film, free from entrapped air, foreign materials and any properties detrimental t
10、o normal production operation. 3.4 REQUIREMENTS (FREE FILM) 3.4.1 Color Black 3.4.2 Cured Flammability (ISO 3795/FMVSS 302) Burn Rate 100 mm/minute max The specimen size required for material approval is 355 x 100 x 2.0 +/- 0.1 mm with a smooth surface. 3.4.3 Hardness, Durometer A 95 +/- 5 (ISO 868/
11、ASTM D2240) 3.4.4 Tensile Strength, 14 MPa min (ISO 37/ASTM D412, Die C, 500 mm/min test speed) 3.4.4.1 Elongation at Break 120% min 3.4.5 Tear Strength 60 kN/m min (ISO 34, Method B, procedure A/ ASTM D624, Die C, 500 mm/min test speed) 3.4.6 Water Absorption 1.0% by wt. max (ISO 62/ASTM D570) 3.4.
12、7 Brittleness Point -40 C max (ISO 812, Type B specimen/ ASTM D2137, Method A) 3.4.8 Heat Aged (ISO 188/ASTM D573, 150 +/- 50 air changes/h, 1000 h at 100 +/- 2 C) Hardness Change 5% max Tensile Strength Change 10% max Elongation Change 10% max 3.4.9 Density 1.03 +/- 0.05 g/cm3 (ISO 1183, Method A/
13、ASTM D 792, Method A1) 3.5 RESISTANCE PROPERTIES (APPLIED TO SUBSTRATE) Test panels are to be prepared with the intended facility application equipment over the intended substrate, pretreatment and paint layering system following the applicable Ford Motor Company material specifications. Apply a smo
14、oth application of material to 75 x 200 mm panels at the target horizontal film thickness. ENGINEERING MATERIAL SPECIFICATION WSS-M99P40-A3/A4 Copyright 2015, Ford Global Technologies, LLC Page 3 of 5 3.5.1 Film Thickness (FLTM BI 117-01, Metallic Substrates, PELT or equivalent) (ASTM B487, Non-Meta
15、llic Substrates, PELT or equivalent) Horizontal Applications 508 -1016 m (20 - 40 mils) Vertical Applications 508 - 1016 m (20 - 40 mils) 3.5.2 Sag Resistance No sag at 2540m (100 mils) Test Method: Apply a wedge of material, ranging from 0 to 4 mm in thickness, to a panel prepared per para 3.5. Pos
16、ition the panels horizontally for 1h at 23 +/- C. Determine the application thickness of observed sag along the wedge. 3.5.3 Adhesion Characteristics 3.5.3.1 Peel Strength Adhesion 3.6 N/mm min (50 mm/min test speed) Test Method: Prepare two panels per para 3.5. Ambient cure at room temperature for
17、24 hours. Make 2 parallel cuts 25 mm apart along the 200 mm length of the panel through to the base substrate with a sharp knife. Insert the tip of the knife and peel back a tab approximately 38 mm long. Using a tensile testing instrument with a 90 constant angle test fixture or equivalent, measure
18、and document the maximum peel strength generated. (It is recommended that a piece of masking tape or aluminum foil be placed over approximately 30 mm of one end of the test panels prior to application of the material.) 3.5.3.2 Pull-Off Strength Adhesion 4.2 MPa min (ISO 4624/ASTM D4541, Elcometer 11
19、0 Pneumatic Adhesion Tester or Equivalent) 3.5.4 Heat Resistance Test 240 h No evidence of blistering, cracking, charring, embrittlement or other deleterious effects after exposure in a mechanical convection oven at 120 +/- 3 C. Peel strength adhesion shall be tested according to para. 3.5.3 3.5.5 W
20、ater Resistance 240 h (FLTM BI 104-01) No blistering, dulling, softening and/or any other film failure. Peel strength adhesion shall be tested according to para. 3.5.3 ENGINEERING MATERIAL SPECIFICATION WSS-M99P40-A3/A4 Copyright 2015, Ford Global Technologies, LLC Page 4 of 5 3.5.6 Humidity Resista
21、nce 240 h (FLTM BI 104-02, Method A) No blistering, dulling, softening, and/or any other film failure. Peel strength adhesion shall be tested according to para. 3.5.3 3.5.7 Laboratory Accelerated Cyclic Corrosion Test (CETP 00.00-L-467, ASTM D610) 12 weeks Grade 6 or better 3.5.8 Fuel Resistance (FL
22、TM BO 101-05) Fuel Composition (FLTM AZ 105-02, ASTM D 471/ISO 1817) by Volume: 1) Reference Fuel F = (diesel fuel, Grade #2, 100%) 2) Reference Fuel I = CM15 3) Reference Fuel K = CM85 After 5 minute recovery time, no color change in excess of Gray Scale rating 4 - 5 (AATCC Evaluation Procedure 1/I
23、SO 105-A02), dulling, surface distortion or permanent softening permitted. 3.5.9 Xylene Resistance No softening or dulling permitted Using a circular motion, rub the surface of the coating 10 times with wetted cheesecloth. 3.5.10 Abrasion Resistance 0.5 g removal max (FLTM BN 108-02/ASTM D 1044, Smo
24、oth Surface, 5000 Cycles, 500g, CS10F) 3.5.11 Scuffing Resistance 0.5 g removal max (FLTM BN 108-04/ASTM D 1044, Smooth Surface, 5000 Cycles, 500g, Scuff Head A) 3.5.12 Stone Chip Resistance, -29 C No cut through to (FLTM BI 157-06 & SAE J400, 4.7 L Gravel substrate allowed Test both smooth and text
25、ured samples) Peel strength adhesion shall be tested according to para. 3.5.3 3.5.13 Environmental Cycling, 3 cycles (FLTM BQ 104-07, Procedure 5) Evaluation after 20 h conditioning at 23 +/- 2 C. No evidence of cracks, no blistering, no change in appearance or other deleterious effect when compared
26、 with an original, unaged part. Peel strength adhesion shall be tested according to para. 3.5.3 ENGINEERING MATERIAL SPECIFICATION WSS-M99P40-A3/A4 Copyright 2015, Ford Global Technologies, LLC Page 5 of 5 3.5.14 High Performance Adhesion 3.5.14.1 Resistance Against High Pressure Cleaner No Removal
27、(FLTM BO 160-04, Method B) Prior to testing, the surface shall be X-scribed through to the substrate (1 mm thick, 30 angle). The test must be performed on the X-scribe. 3.5.14.2 Thermal Shock (alternate method) No Removal (FLTM BI 107-05) 3.6 PROCESS WINDOW DEFINITION The supplier shall perform Appl
28、ication and Adhesion DOEs to determine the process window of the system. The application variables to be included in the design are thickness and booth temperature and humidity. The adhesion variable to be included in the design is the mix ratio. An initial screening experiment should be run to dete
29、rmine what level will generate a window which includes testing to failure. This screening experiment should be reviewed with the Materials Engineer to set up the final DOE. Response attributes to the DOE should be based on the materials tested and should be chosen from the following tests: Initial P
30、eel Strength Adhesion (para 3.5.2), Heat Resistance (para 3.5.3), and Humidity Resistance (para 3.5.5). 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. Contact for questions concerning Engineering Material Specifications.
