1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW17046 Performance Requirements for Paints on Underhood Plastic Substrates Copyright 2013 General Motors Company All Rights Reserved December 2013 Page 1 of 4 1 Scope 1.1 Material Description. This specification supercedes all prior regional
2、specifications for interior paint performance for the General Motors Company and encompasses interior physical, environmental and chemical durability requirements for all underhood paints on plastic substrates. These paint systems can be metallic or non-metallic colors in both hard and soft haptic t
3、echnologies. Paints covered by this specification can be applied to plastic substrates, flexible substrates, rigid substrates or integral skin foam systems. The extended durability testing in this specification is required for corporate approval of all new underhood paints. The requirements listed i
4、n this specification must be met by all paint systems used in GM vehicle engine compartments. This specification will be used to generically qualify red and blue colored paints for global paint technology approval. When a paint system is generically approved on a specific plastic, the paint system w
5、ill then be approved to the appropriate interior paint specification and entered into MATSPC. Once MATSPC approval is granted to a new paint system on a given class of plastics, specific color approval and Approval Paint on Plastic Systems (APOPS) testing (reference GMW14797 for interior trim compon
6、ents), will be required to complete the approval on that part. The approved paint system will then be entered into the APOPS database or documented through written approval from the responsible GM Materials Engineering department. The test requirements for APOPS testing will be found in Table A3 and
7、 Table A10 of GMW14797. Note: In the case where parts are fabricated from pre-painted material, the paint film shall be capable of withstanding all the necessary fabrication processes, including forming stresses and temperatures, in addition to specified requirements as detailed in this specificatio
8、n. 1.2 Symbols. Not applicable. 1.3 Typical Applications. Appearance (Beauty) covers in the engine compartment. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D3763 ISO 20433 ISO 6603-2 2.2 GM Standards/Spe
9、cifications. GMW3059 GMW3221 GMW14729 GMW14829 GMW3205 GMW14444 GMW14797 GMW17013 GMW3208 GMW14698 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1 Requirements on Test Specimens. Reference GMW3221. Straight shade paint system tested
10、 on panels must be identical to the production intent paint system including paint manufacturers recommended film builds. All testing must be done in triplicate on painted red and blue panels at a GLDG gloss (gloss of 2 to 3 at a 60 degree angle) for initial paint technology approval. Metallic paint
11、s must be submitted in bright colors similar to Nova Silver, and paint film must be between 25 m +5 m/-2 m. 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 ENGINE
12、ERING STANDARDS GMW17046 Copyright 2013 General Motors Company All Rights Reserved December 2013 Page 2 of 4 3.2. Sample Preparation and Identification. The plastic substrates and paint system shall be identified per 3.2.1 and 3.2.2. 3.2.1 Plastic Substrate. Vendor Compound number Sample plaque thic
13、kness in millimeters 3.2.2 Paint System. Vendor Paint formulation number The paint process guidelines of the paint supplier including coating thickness requirements shall be followed 3.3 Conditioning. Painted samples shall be subjected to the following tests after a minimum aging period of 72 h at r
14、oom temperature following the baking or drying cycle. 3.4 Cure Test. The cloth to be used to perform the cure test shall be a crock cloth per ISO 20433. The solvent used for the cure test shall be 92% minimum ethyl alcohol denatured with 2-butanone. There shall be no paint film degradation after the
15、 following test method: Five back and forth rub strokes, approximately 50 mm in length, as applied with firm finger pressure using a cloth saturated with denatured ethyl alcohol. Note: There may be some visible transfer of color agents associated with this procedure, but there must not be any film d
16、egradation visible when viewed with a 10x magnifying glass. 3.5 As-received Paint Adhesion. Test per GMW14829, Type A, with a minimum of 95%, rating 1, of the paint remaining in the crosshatch area. 3.5.1 Brittleness of the paint film, as evidenced by chipping or flaking while scribing the test line
17、s, shall be cause for rejection. 3.6 Humidity Test (GMW14729). Samples shall be exposed to 144 h of GMW14729, either Option A or B. After the 144 h humidity exposure, the painted samples will be removed from the humidity chamber and blotted dry with an absorbent paper or cloth. 3.6.1 There shall be
18、no evidence of blistering, water spotting or gloss change when examined one minute after removal from the humidity cabinet. 3.6.2 One hour after removal from humidity chamber, the samples shall pass the crosshatch adhesion test GMW14829 with a rating of 1. 3.7 Effects of Underhood Fluids. 3.7.1 Part
19、s in the as-received condition shall be resistant to attack from underhood fluids when tested per GMW17013, Method B, Standard Fluids. 3.7.2 One hour after removal from fluid, the samples shall pass the crosshatch adhesion test per GMW14829 with a rating of 1. 3.8 Oven Aging. 3.8.1 The surface finis
20、h must not develop any perceptible color or gloss change, loss of adhesion, distortion or exuding after being subjected to 168 h exposure at 150 C in an air-circulating oven. 3.8.2 Temperatures of ovens shall not vary more than 2 C. (Reference part location classification in GMW14444.) 3.8.3 Painted
21、 samples subjected to oven aging shall withstand the adhesion tests per GMW14829 after a 24 h humidity exposure per 3.6. Recovery period of 1 h should be allowed between removal from the oven and exposure in the humidity chamber. A rating of 1 per GMW14829, Type A, is the requirement. 3.9 Multi-axia
22、l Instrumented Impact Testing. Testing must be carried out according to ASTM D3763 and ISO 6603-2. The results according to ASTM D3763 are for approval and according to ISO 6603-2 for information. The results of both tests must be submitted. Test five painted and five unpainted control plaques at a
23、temperature of -30 C. (For the ASTM test, use an impact speed of 6.6 m/s. For the ISO test, use impact speed of 4.4 m/s, a 20 mm diameter impact probe, and a 40 mm diameter clamp.) Impact the samples on unpainted surface. Determine impact energy for each sample as the total area under the curve to t
24、he point of 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 GMW17046 Copyright 2013 General Motors Company All Rights Reserved December 2013
25、 Page 3 of 4 maximum load. Compute the mean impact energy of the painted and unpainted samples. For ASTM D3763 testing, there shall be no more than a 20% reduction in the mean impact energy. For ISO 6603-2 testing, report energy at maximum force. Plaques must not go from ductile to brittle. Note: Th
26、is requirement may be waived for a paint system as applied to a specific component if the painted component in question complies with all applicable component and system impact and durability requirements. Note: Condition panels at -30 C for 4 h minimum prior to impact. The painted samples must be i
27、mpacted at the low temperature. Removing the painted samples from the low temperature -30 C environment and impacting at room temperature is not allowable. 3.10 Wear Resistance. The surface finish on painted plastic substrates shall show no wear-through or other adverse effects after 1000 cycles per
28、 nominal 25 m dry film build of the Taber abrader wear tester, per GMW3208, CS-10 wheels with a 500 g load. Note: Wear-through is defined as topcoat wear through to primer where primer coat application is used and topcoat wear through to substrate when no primer coat is used. A topcoat or primer col
29、or different from the substrate is recommended to best define the end point of the wear test. 3.11 Scratch Resistance (GMW14698). Painted surface shall not show visible penetration where the 1 mm hemispherical tip weighted with a 13 N load has been dragged across the surface per GMW14698. Testing sh
30、all be done before and after the following conditions: In the as-received condition After oven aging per 3.8 3.12 Mar Resistance (GMW14698). Using GMW14698 test methods to determine mar resistance, no obvious visually apparent marring of the painted surface shall be noted after the 1 mm hemispherica
31、l tip weighted with a 13 N load has been dragged across the surface. Testing shall be done before and after the following conditions: In the as-received condition After oven aging per 3.8 3.13 Odor (GMW3205). Paint must have a rating of 6 or higher when tested to GMW3205, Coding B, dry condition. 4
32、Manufacturing Process 4.1 Paint Processing Requirements. Paint supplier shall provide the following information in electronic form for paint and/or primer, if required for specific applications: Specification test data Application requirements which include: Recommended film build Flash time Bake wi
33、ndows for conventional ovens Bake windows for infrared (IR) ovens 5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy applicable laws, rules, regulations and recommendations valid in the country of usage. 5.2 Language. In the event of conflict between the English and domestic l
34、anguage, the English language shall take precedence. 5.3 Inspection and Rejection. Samples of components or materials released to a GM material specification shall be tested for conformity with the requirements of this material specification and approved by the responsible Engineering department pri
35、or to commencement of delivery of bulk supplies. A new approval must be received for any changes, e.g., properties, manufacturing process, location of manufacture, etc. If not otherwise agreed, all testing and documentation normally required for initial release must be completed. Copyright General M
36、otors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW17046 Copyright 2013 General Motors Company All Rights Reserved December 2013 Page 4 of 4 It is the responsi
37、bility of the supplier to inform the customer in a timely manner, without solicitation, and to include documentation of all modifications of materials and/or processes and to apply for a new release. If not otherwise agreed, all release tests shall be repeated and documented by the supplier prior to
38、 commencement of delivery of non-conforming bulk supplies. In individual cases, a shorter test can be agreed to between the responsible Engineering department and the supplier. 5.4 Material Safety Data Sheets/Safety Data Sheets (MSDS/SDS). For new product submissions, or when a change in chemical co
39、mposition of an existing product has occurred, a complete copy of the Material Safety Data Sheet/Safety Data Sheet must be submitted in compliance with the Globally Harmonized System of Classification and Labeling of Chemicals (GHS) requirements or other country-specific MSDS/SDS requirements. In ad
40、dition, product MSDS/SDS submissions must be in compliance with specific country General Motors TMC003 Material Safety Data Sheet/Safety Data Sheet guidance documents where available. 5.5 All materials supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable
41、Substances for Parts. 6 Approved Sources Materials supplied to this specification must be approved by General Motors. A list of approved materials can be found in MATSPC. This GM Material File is provided to third parties to reduce redundant testing of materials. If approved material already listed
42、is used, the part supplier can use GM Material File reference for Production Part Approval Process (PPAP) material approval. If the decision is made to use a not yet approved material, contact the Finishes and Coatings Global Subsystem Leadership Team for details on the approval process. The materia
43、l approval process must be completed prior to PPAP start date of the part supplied to General Motors. 7 Notes 7.1 Glossary. MATSPC: Global repository of GM approved materials for corresponding GM Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. APOPS Approval Paint on Plastic Systems
44、 GHS Globally Harmonized System of Classification and Labeling of Chemicals GLDG Gloss of 2 to 3 at a 60 degree angle IR Infrared MSDS Material Safety Data Sheet PPAP Production Part Approval Process SDS Safety Data Sheet 8 Coding System This standard shall be referenced in other documents, drawings
45、, etc., as follows: Material per GMW17046 9 Release and Revisions This standard was originated in September 2013. It was first approved by the Finishes & Coatings Global Subsystem Leadership Team in December 2013. It was first published in December 2013. Issue Publication Date Description (Organization) 1 DEC 2013 Initial publication. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
