1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16857 Hydrographics for Exterior Applications Copyright 2012 General Motors Company All Rights Reserved December 2012 Originating Department: North American Engineering Standards Page 1 of 4 1 Scope This specification covers the initial qual
2、ification (technology approval) and performance requirements (finished part) for exterior Hydrographic printing. 1.1 Material Description. The Hydrographics (HG) process consists of a water soluble decorative film which deposits an ink pattern onto a plastic part. The ink pattern is a continuous lay
3、er covering the entire plastic part. A protective clearcoat must be applied after ink transfer to meet wear resistance, ultraviolet (UV) stability, and all other performance requirements of this specification. An example of an exterior plastic part with Hydrographic ink system: Molded plastic/baked
4、adhesion promoter/primer/baked basecoat/Hydrographic inks/baked clearcoat. Hydrographic ink system layering can vary from the preceding example. If the basecoat layer is absent or offers low UV protection, then a UV stabilized grade of substrate must be used and validated for durability with the pro
5、duction intent finish. Substrates can be various plastic materials. 1.2 Symbols. Not applicable. 1.3 Typical Applications. These Hydrographic printed designs can be used on outside rearview mirror shells, appliques, and other exterior trim parts. 1.4 Remarks. Submission requirements in 3.3 for techn
6、ology approval are for adhesion promoters/primers, basecoats, and clearcoats previously approved to “existing 998” specifications. Basecoat/clearcoat systems must also be previously approved to GMW3005. Substrates must be previously approved to “existing GMWs” or regional specifications. Each combin
7、ation of specific substrate, adhesion promoter/primer basecoat, Hydrographic ink pattern, and clearcoat applied to a part or plaque must be tested and approved to this specification. Any new pigment or pigment combination, used in the basecoats or inks, not previously used in any GM color, or any ne
8、w pigment or pigment combination not previously used in the proposed resin system, must have two years (minimum) Florida exposure data (per GM9620M) submitted, and approved by Materials Engineering. Additionally, each specific substrate, adhesion promoter/primer basecoat, Hydrographic ink pattern, a
9、nd clearcoat combination approved to this specification must be tested to and approved to GMW14797, Approved Paint on Parts System (APOPS), on parts processed through a production intent process, as a total system. After the entire pigment library and Hydrographic ink system is granted technology ap
10、proval, new colors are entered into the Blue Sky database for color development requiring 2500 kJ Xenon accelerated weathering. For new basecoat/clearcoat systems, full approval to GMW3005 is required. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2
11、.1 External Standards/Specifications. ISO 7724-1 SAE J1545 SAE J2527 2.2 GM Standards/Specifications. GM9620M GMW14124 GMW14701 GMW14829 GMW3005 GMW14333 GMW14729 GMW14873 GMW3059 GMW14700 GMW14797 GMW15919 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at
12、 ). 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 GMW16857 Copyright 2012 General Motors Company All Rights Reserved December 2012 Page 2
13、of 4 3 Requirements 3.1 Submission Letter. Prior to qualification testing, the supplier must submit documentation to the appropriate Materials Engineer listing the manufacture and product codes of the ink(s) used in the HG being considered for approval to this specification. In addition, the manufac
14、ture and product codes of the ink(s) used in the HG must be included in Table A6 of GMW14797, APOPS. 3.2 Panel Preparation. Prior to start of panel preparation, contact the responsible engineer to ensure proper selection of substrate, adhesion promoter/primer, basecoat, Hydrographic inks, and clearc
15、oat. All coatings will be applied at target films and bakes unless otherwise specified. 3.2.1 Sample Size. The number of samples for each test shall be three per ink pattern, unless the responsible engineer and supplier agree on a different number for specific tests, prior to the start of testing. A
16、ll coating layers shall be fully identified with source, product code, batch number, bake description, and film build. 3.2.2 Test Substrates. Test substrates shall be production intent material. 3.3 Submission Requirements. The test requirements for the specific combination of substrate, adhesion pr
17、omoter/primer, basecoat, Hydrographic ink pattern, and clearcoat are as follows: a. Initial Tape Adhesion (GMW14829, crosshatch). Maximum rating of 1. b. Adequacy of Cure. Maximum rating of 0. c. 240 h Humidity (GMW14729, Option A) followed by tape adhesion (GMW14829, crosshatch). No appearance chan
18、ge. Maximum rating of 1. d. Chip Resistance (GMW14700, Method B). Minimum rating of 9. e. Gasoline Resistance (thermoplastic olefin (TPO) substrates only), (GMW14333-B). Immersion test to 15, 30, 45, and 60 minutes. Maximum coating removal of 20% after 15 minutes. Report results after 30, 45, and 60
19、 minutes. f. Chemical Resistance (not required if clearcoat is approved to an “existing 998” specification), (GMW14701). All materials rated 10 except as follows: Rating 8 egg albumin Rating 4 acid train pH 3 Rating 6 sulfuric acid pH 4 Rating 2 sulfuric acid pH 0 Rating 4 brake fluid g. Moisture Co
20、ld Cycle (GMW14124, Cycle A, 15 cycles) plus 24 h humidity (GMW14729, Option A), followed by tape adhesion (GMW14829, crosshatch). No appearance change. Maximum rating of 1. h. Thermal Shock (for TPO substrates only), (GMW15919). No removal of coating. i. Test the following sections of GM9620M: 1. P
21、aragraph 3.2.1.5 UV Transmission Filmbuilds 2. Paragraph 3.2.1.6 Black/White Hiding Filmbuild 3. Paragraph 3.2.1.7 UV Fortification Package 4. Paragraph 3.2.1.8 Ultraviolet Transmission Test 5. Paragraph 3.2.1.9 Test Panel Preparation and Report 6. Paragraph 3.3.3.5 Accelerated Testing 7. Paragraph
22、3.3.3.6 Outdoor Exposure Testing j. Weathering: Xenon Arc Weatherometer (SAE J2527) Extended UV Filter Combination. Each ink pattern and/or new ink colors prepared per 3.1 shall be exposed to 2500 kJ/m, 3500 kJ/m, and 4500 kJ/m per SAE J2527, extended UV filters. After each exposure time period, exp
23、ose to 96 h humidity (GMW14729) plus tape adhesion (GMW14829). No appearance change, maximum rating of 1. Gloss loss after 2500 kJ/m2 is 15% (polished and unpolished) maximum, and after 4500 kJ/m2 is 20% (polished and unpolished) maximum. See 3.4 for visual examination requirements. Also run a contr
24、ol. Florida Open Rack Direct Weathering Exposure (GMW14873). Each ink pattern and/or new ink colors prepared per 3.1 shall be subjected to 12, 24, 36, 48, and 60 months exposure at 5 degrees facing south Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot fo
25、r ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16857 Copyright 2012 General Motors Company All Rights Reserved December 2012 Page 3 of 4 in Florida. After each exposure time period, expose to 96 h humidity (GMW14729) plus tape adhes
26、ion (GMW14829). No appearance change, maximum rating of 1. Gloss loss after 24 months Florida exposure shall be 20% (unpolished) and 10% (polished) maximum after 24 months, and 35% (unpolished) and 30% (polished) maximum after 60 months. The following exposure times are for information only: 36 mont
27、hs 48 month. 60 months 3.4 Visual Examination. Wash weathered specimens prior to making measurements and observations. Wash with scrubbing action, using a sponge that is saturated with a solution consisting of soap and deionized water at +23 C 3 C. Exposed parts shall not exhibit any indications of
28、surface tackiness or embrittlement, change in hardness, blooming, blistering or other factors that might affect the function or appearance of the part. The color change shall not exceed a E of 3.0 units. If color change cannot be measured instrumentally due to the ink pattern, a visual evaluation ca
29、n be used. The color change shall be measured per ISO 7724-1 or SAE J1545 (CIELAB color space, 10 degrees observer, metering orifice 10 mm, Illuminant D65, specular component included). Visual color change that is considered objectionable shall override the E measurement. Part must not exhibit objec
30、tionable color change. Slight on-tone color fade is acceptable. Note: Completion of 36, 48, and 60 months Florida testing is not required for technology approval. The Florida testing, however, shall be ongoing with a minimum of 24 months Florida, 4500 kJ/m2 Xenon exposures, and all accelerated tests
31、 completed before technology approval is granted. Contact Materials Engineering if weathering panels with objectionable results are returned after 36, 48, and 60 months Florida testing. 3.5 Natural Weathering Test Location Areas. Any of the following locations are considered equivalent as a test sam
32、ple location. Obtain agreement from the regional GM Engineering group prior to sending test samples out for exposure. Miami or Southern Area, Florida, USA Jurez, Mexico Allunga, Queensland, Australia Cruz Alta, Brazil Okinawa, Japan 3.6 The combination of specific substrate, primer, basecoat, Hydrog
33、raphic ink pattern, and clearcoat applied to a part in a production intent process must be tested and approved to GMW14797 (APOPS) (part performance) as a total system. Each ink pattern and/or new colors must be exposed to Xenon accelerated weathering, and open rack weathering in Florida. For new ba
34、secoat/clearcoat systems, full approval to GMW3005 is required. 4 Manufacturing Process Not applicable. 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 confl
35、ict between the English and domestic language, 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
36、responsible Engineering department prior 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
37、must be completed. 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 GMW16857 Copyright 2012 General Motors Company All Rights Reserved Decemb
38、er 2012 Page 4 of 4 It is the responsibility 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 a
39、nd documented by the supplier prior to 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 submis
40、sions, or when a change in chemical composition 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
41、-specific MSDS/SDS requirements. In addition, 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
42、of GMW3059, Restricted and Reportable 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
43、. If approved material already listed 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 & Coatings group for detail on the approval process. The
44、 material 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 Approved Paint on Parts S
45、ystem GHS Globally Harmonized System of Classification and Labeling of Chemicals HG Hydrographics MSDS Material Safety Data Sheet PPAP Production Part Approval Process SDS Safety Data Sheet TPO Thermoplastic Olefin UV Ultraviolet 8 Coding System This standard shall be referenced in other documents,
46、drawings, etc., as follows: Material per GMW16857 9 Release and Revisions This standard was originated in August 2012. It was first approved by the Finishes & Coatings Global Subsystem Leadership Team in December 2012. It was first published in December 2012. Issue Publication Date Description (Organization) 1 DEC 2012 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-,-,-
