1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW3002 Primer Surfacer, Body Paint - Generic Qualification Copyright 2011 General Motors Company All Rights Reserved August 2011 Originating Department: North American Engineering Standards Page 1 of 13 1 Scope This specification covers the pr
2、ocedure and the minimum performance, compatibility, processing and general requirements for international corporate technology approval of primer paint materials. Additional testing and any exceptions to the requirements detailed in this specification are noted in the individual primers respective 9
3、98XXXX (GM North America), L XXX XXXX (GM Europe), and EDS-M-87XX (GM Korea) specifications. Included are the requirements for: x Product Information x Performance x Compatibility x Processability 1.1 Material Description. The paint material covered in this specification is primer surfacer which is
4、intended to be applied and baked over electrodeposition (ELPO, E-coat, Electrocoat) primer prior to topcoat. 1.2 Symbols. Not applicable. 1.3 Typical Applications. Primers covered under this specification may be applied as liquids or powders. Typically, they are sprayed over Elpo or other primers ap
5、plied to metal or plastic. a. Primer surfacers may generally be applied as: 1. Color-key Primer. This is the general body primer, applied to the exterior of the vehicle. Two to three systems are typically provided, which can include gray, white, and/or red. 2. Color-specific Primer. These are primer
6、s which are utilized on the interior surfaces of the body (trunk, motor compartment, underhood/decklid) or exterior. Each color-specific primer is coordinated to the topcoat color. b. The primer must be evaluated for plant-specific material compatibilities if the materials currently used in the targ
7、et plant are different from those used to approve the technology. c. Performance on finished parts must be demonstrated per GMW14671 (metal parts) and GMW14797 (plastic parts) and the General Motors Europe (GME) equivalent specifications. Validation testing of specific combinations of approved plast
8、ic substrate, paint material, and processing on plastic parts must be completed as required by the responsible engineering group, Applied Paint on Parts System (APOPS). 1.4 Remarks. Not applicable. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 E
9、xternal Standards/Specifications. ASTM D1125 ASTM D2240 ISO 2431 ISO 3251 ASTM D1474 ASTM D3451 ISO 2808 ISO/TS 16949 ASTM D1895 ASTM D3960 ISO 2811 ASTM D1921 ISO 1148 ISO 2815 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or
10、 networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3002 Copyright 2011 General Motors Company All Rights Reserved August 2011 Page 2 of 13 2.2 GM Standards/Specifications. 9984801 GMW3011 GMW14729 GMW15777 GM4352M GMW3041 GMW14797 GMW15891 GM4365M GMW3059 GMW148
11、29 GMW16170 GM4389M GMW14124 GMW14872 GM9661P GMW14333 GMW14873 GM9709P GMW14671 GMW15119 GMW3008 GMW14700 GMW15545 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1 Submission Requirements. 3.1.1 Submission Letter. Prior to qualifica
12、tion testing, the supplier must submit a letter to the Global Paint and Polymers Center (GPPC) Primer Specialist with the following information: x Product name x Purpose of the submission x Description of the chemistry and components (full product formulation) and as compared to a current, approved
13、technology x Site of origin and history of product evolution x Key data for environmental impact; e.g., Volatile Organic Compounds (VOC), weight solids, volume solids, etc. x Material Safety Data Sheet (MSDS) (full disclosure) x Current Product Data Sheet A summary of the product information require
14、d is shown on Data Sheet A1. At completion of material testing, the supplier must provide at least two copies of the submission book to the requesting GM engineer. 3.1.2 Material Identification. All paint layers and substrates used in the submission must be identified by the source, product code and
15、 batch, including color name WAXXXX (GM North America) or L XXX XXXX (GME), where appropriate. All film builds and bakes are to be documented. 3.1.3 Process Identification. A baseline target and range for both film build and bake must be stated as part of the submission. Actual targets and ranges wi
16、ll be finalized following full evaluation of the data submitted per this specification. Application equipment and spray parameters are to be documented. Target and variance for mix ratio of any two component materials must be specified. All reprocess materials and procedures must be evaluated and do
17、cumented. 3.1.4 Health and Environmental Issues. The supplier must provide a Material Safety Data Sheet for all components of the primer technology. The MSDS will be reviewed by the Health and Environmental groups from each country. 3.1.5 Submission Package. The submission book must be prepared in t
18、wo formats: a hard copy and an electronic copy. The book shall have a table of contents and tabs that make it easy to find each section. Sections shall be organized to follow the order of the specification so that information of interest can be readily located. The electronic copy should also be org
19、anized in the same manner. All test results, Key Control Characteristics (KCC) and Key Product Characteristics (KPC), photographs, and related interim approvals are to be included as a permanent record of the product. The books are to be in English and according to the local language. Copyright Gene
20、ral Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3002 Copyright 2011 General Motors Company All Rights Reserved August 2011 Page 3 of 13 3.1.6 Plant-spe
21、cific or Mini-submission. Some approvals may require plant-specific or mini-submissions when only minor changes are made to previously approved primer materials or if they are to be used in plants that will be receiving the material for the first time. Testing requirements are outlined in Data Sheet
22、s A2 and A3. Tests may be added or deleted according to the type and amount of material modifications. These shall be determined prior to testing by the responsible engineer. 3.2 Production Part Approval Process (PPAP) Requirements. Product approval is required under the established guidelines outli
23、ned in the AIAG Production Part Approval Process and ISO/TS 16949. At product approval, the supplier is expected to have reviewed specific documentation per Advanced Product Quality Planning (APQP) to GMs satisfaction; i.e., Product Design Failure Mode Process Failure Mode KCCs; KPCs; Measurement Sy
24、stems Analysis (MSA) and Manufacturing Control plans. 3.3 Product Information. 3.3.1 Physical Constants. Data on all physical constants must be provided as formulated and as sprayed, if different. All reducing solvents used in the technology approval must be identified (Data Sheet A1). 3.3.2 Formula
25、ting Range. The formulating range of all ingredients must be specified at the time of submission. Information on the technologys ingredient formulation ranges for the various resin systems, pigments, flow control agents, additives, and key manufacturing control characteristics must be provided as pa
26、rt of the submission package. If a product change is proposed outside of the technology formulation limits, the responsible engineer must be notified. All ingredient ranges, key manufacturing control limits, and certificate of analysis ranges must pass standard gage repeatability and reproducibility
27、 studies. 3.3.3 Infrared (IR) Chemical Fingerprint. The supplier must provide infrared data to document the fingerprint of the recommended formula. All materials subsequently supplied under the designated specification and material code must correspond to the reference spectrum when compared under t
28、he same conditions. GM may conduct infrared spectrophotometery analysis of the materials supplied to this specification. Analyses may also be performed on topcoat that is removed from representative panels with film thickness and bake at target levels. The IR spectra established for initial approval
29、 shall constitute a reference standard and shall be part of the submission package. 3.3.4 Ultraviolet (UV) Transmission (GMW15545). For exterior primers, samples must be prepared with primer alone at minimum film build and target bake and tested per GMW15545. The wavelength range is 300 to 700 nm an
30、d the scale is 20%. There must be no more than 0.1% T at 360 nm and 0.5% T at 400 nm. If the requirement causes a significant increase in pigment-to-binder (P/B) and/or cost, then the system would need to be evaluated for UV requirements. The system is defined as the primer and all the appropriate b
31、asecoat colors and clearcoat that will be applied over the primer. The system would have to pass the above specification as follows: x Primer: Lower Limit of Film Build for Durability (20 m for Liquid Solventborne Primer, 18 m for Liquid Waterborne Primer, 38 m for Powder Primer) x Basecoat: Lower L
32、imit of Film Build for Durability (10 m) x Clearcoat: Lower Limit of Film Build for Durability (38 m) 3.3.5 Odor Characteristics (GM9709P). The materials odor potential must be compared with that of a current production material per GM9709P. Any solvent changes for plant-specific implementation must
33、 be reviewed to determine if retesting is required. This is not applicable to GM4365M materials. 3.4 Panel Preparation. Prior to start of panel preparation, contact the responsible engineer to ensure proper selection of substrate, pretreatment, ELPO, topcoat and other miscellaneous materials. 3.4.1
34、Sample Size. The number of samples for each test shall be one per color for all tests except chip, which shall be three per color, product code, bake description, and film build. All substrates, pretreatments, and coating layers shall be fully identified with source, product code, batch number, bake
35、 description, and film build. 3.4.2 Pretreatment. 3.4.2.1 Plastic Substrates. All Reaction Injection Molding (RIM) or Reinforced Reaction Injection Molded (RRIM) resin panels must be given a postcure that is a minimum of 8 C (15 F) higher than the maximum topcoat bake prior to paint application. Pow
36、er washing per 9984801 or appropriate GME cleaning agent must be used. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3002 Copyright 201
37、1 General Motors Company All Rights Reserved August 2011 Page 4 of 13 3.4.2.2 Metallic Substrates. All metallic substrates must be pretreated using either phosphate (GMW3011) or thin film pretreatment (GMW16170) and electrocoated with an approved electrodeposition primer (GMW3008). Pretreated test p
38、anels from the current approved supplier may be used where appropriate per agreement with the responsible engineer. 3.4.3 Paint Application. All test materials must be sprayed at the target application viscosity. Control samples must be sprayed at production viscosity and with production reducers wh
39、ere applicable. 3.4.4 Film Thickness (ISO 2808). Target upper and lower film build limits are established by initial screening. Primer film build is characterized by the following: x T: Target which is typically a midpoint x LL: Lower film build limit x UL: Upper film build limit All other coating l
40、ayers shall be applied at their target film builds for testing unless otherwise stated. Acceptable applied film build ranges (LL to UL) will be determined upon satisfactory completion of all test requirements. 3.4.5 Panel Conditioning. Coated panels shall be subject to an aging period of at least 72
41、 h at room temperature (23 5 C; or 73 9 F) and 50 5% relative humidity following the bake cycle and prior to testing unless otherwise requested. 3.4.6 Appearance. The primer coating shall be smooth and uniform; i.e., free of sags, craters and other surface defects. The appearance must meet or exceed
42、 all requirements as stated in GMW15777 and the International Uniform Vehicle Audit Procedure. 3.4.7 Control Panels. Control panels of a proven commercial system are required for comparison on all tests except windshield bonding. The supplier is also expected to incorporate procedures which will ens
43、ure that the right material and processes are used and that test equipment is properly calibrated and run (and provide documentation if requested). In addition, the supplier shall provide explanations for any unusual defects that occur. 3.5 Bake Definitions. A baseline target and target range for bo
44、th film build and bake must be established up-front for the submission. Actual targets and ranges will be finalized after full evaluation of film build and cure interactions. Application equipment and spray parameters used for the submission must be identified. 3.5.1 Bake. Bake is defined as the tim
45、e the substrate is within the temperature range of acceptable cure. Document the oven type used (direct- or indirect-fired). For testing performed in the United States, gas-fired ovens shall be utilized unless otherwise specified by the requesting engineer. Panel temperature must be monitored with t
46、hermocouples or thermistors, using a Datapaq or agreed upon equivalent to ensure that test panels are processed at specified times and temperatures. Note: Oven loading and panel position may affect actual cure. Simulations may need to be initiated to address correlation between lab and plant ovens.
47、3.5.2 Target Bake Definition. The responsible engineer will dictate the target bake requirements of the primer material prior to technology approval. 3.5.3 Bake Chart. The supplier must furnish complete information regarding the effect of bake time and temperature on all appearance, durability and g
48、lass-bonding characteristics utilizing data generated from a Design of Experiment (DOE). The responsible engineer should identify the target (T) bake time and temperature, around which the DOE will be performed. The minimum bake latitude for primers is a 20 C range, from minimum time up to 3 x T min
49、utes. The DOE shall be designed such that the bake parameters exceed the range of LL and UL bakes in order to ensure validation of the DOE through both pass and fail conditions. A bake chart with an explanation of expected results outside of acceptable cure parameters is required. See Figure 1 for Bake (Cure) Chart Template. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproducti
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