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1、VND.GM =l=l8424b-ENGL l,=l=li W 900b379 00L004b T=l3 - I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Paint I END OF LINE RE-PROCESS BCICC SYSTEM 9984246 1 SCOPE. This specification covers the requirements of basecoaticlearcoat end of line reprocess systems that cure by air dryin
2、g or force drying 88C or less and are defined as low bake. They are designed to re-process OEM basecoat/ clearcoat systems but are of different formulations and/or chemistries than OEM products to be re-processed. These products are high performance materials that offer improved overall durability c
3、ompared to acid catalyzed melamine sys- tems. 1.1 The basecoat and clear coat may be one component or two component materials of varying chemistries. They are typ- ically higher in VOC than OEM systems and must be validated for emission compliance on a plant-by-plant basis. 1.2 Basecoats and clearco
4、ats approved to this specification are not interchangeable. Only the specific BC/CC combina- tions tested during qualification can be used for production. Basecoat components are identified by 9984542. Clearcoat components are identified by 998410 1. 1.3 These reprocess systems are approved for use
5、with the specific OEM BUCC system tested during qualification, 1.4 Use over additional OEM BUCC systems and changes of pigment must be evaluated as part of the GM9620M procedure prior to plant release once the reprocess system is approved. 1.5 RESTRICTED AND REPORTABLE CHEMICALS (GMlOOOM). All mater
6、ials supplied to this specification must comply with the requirements listed in GMlOOOM, Restricted and Reportable Chemicals.” 2 REFERENCED STANDARDS. GMlOOOM GM9533P GM4364M 9982075 GM4367M 9984059 GM4389M 9984094 GM9620M 9984101 GM4465P 9984121 GM907 1P 9984542 GM9125P ASTM D1180 GM9163P ASTM D127
7、4A GM9505P SAE J1960 GM9508P SAE J2020 GM9509P 3 PRODUCT INFORMATION. A submission letter, a Material Safety Data Sheet (MSDS), and basic physical prop- erty information of the material must be provided as per requirements of GM4367M. The responsible engineer will issue a Test Work Order (TWO), to e
8、stablish any additions to or changes in basic information required. The responsible engineer will establish the proper substrates, associated materi- als, and control materials to be used in the submission. The supplier must then provide all applicable product information as detailed in GM4367M and
9、the TWO. 4 PERFORMANCE REQUIREMENTS. All testing specified in GM4367M for acid-catalyzed OEM materials must be done, Controls are OEM materials or current acid-cat- alyzed end-of-line re-process systems at target film conditions. Additions or exceptions to GM4367M are to be noted. These systems must
10、 meet the minimum durability requirements of GM4367M for Class 2, Type A and B materials. 4.1 PANEL PREPARATION. Four (4) colors must be tested White, Light Metallic, Red Metallic, and Black. OEM panels can be prepared with any approved phosphate and electrodepo- sition primer. Surfacer is not requi
11、red. OEM topcoat panels are to be prepared at target film/high bake (90 minutes T + 14C). All other OEM layers are to be at target film and bake unless otherwise specified in individual tests. Panels must be prepared and tested in two ways for unrestricted approval: 1. Panel Re-process - Full recoat
12、 over OEM finish. 2. Spot Re-process - Wedge of re-process BC/CC over sanded OEM ftish. 4.1.1 Panel Reprocess. Sand l/2 of the OEM panel horizon- tally with 600 grit paper (or equivalent). Recoat with uniform film of re-process BC/CC. Minimum basecoat film is the mini- mum for a specific color based
13、 upon workability and LJV transmission. The minimum clearcoat film is 1.5 mils unless otherwise specified by the supplier. 4.1.2 Spot Reprocess. Scuff sand 314 of the panel. Apply a wedge basecoat starting at the bottom of the panel. Then apply a wedge of clearcoat starting at the bottom of the pane
14、l. 4.1.3 Cure. For force-dried systems, the maximum cure is 20 minutes 88 C. For air-dry systems, minimum cure for basic handling and adhesion properties is 30 minutes 22C. The supplier will define the minimum and maximum cure for each specific technology. For nontest layers that are baked, use the
15、following protocol: T - Target Bake L = Lower Limit Bake = 20 minutes (T-6C) H - Upper Limit Bake - 90 minutes (T+14”C) 4.1.4 Panel Aging. Except as noted for individual tests, age panels for 72 h prior to the start of testing. NOTE: Do not exceed this time for basic testing. 4.2 APPEARANCE (GM4364M
16、). There must be no signifi- cant variance from the OEM topcoat material in texture, hue, or chroma. 4.3 FILM BUILD (ASTM 01180). End-of-life re-process films will vary depending on the process (panel or spot re-pro- cess) and the basecoat color. Use the following guidelines unless otherwise specifi
17、ed per up front agreement Basecoat Film Range: 0.4 to 1.4 mils (10 - 36 p) Clearcoat Film Ranges: 1.5 to 2.5 roils (38 - 64 p) JUNE 1997 PAGE 1 9984246 Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/2
18、3/2008 23:58:19 MDTNo reproduction or networking permitted without license from IHS -,-,- VND.GM =l=l8424b-ENGL 1997 - 900b379 IJOLOO47 92T m I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Paint I END OF LINE RE-PROCESS BClCC SYSTEM 9984246 4.3.1 Total film build of OEM plus EOLR
19、 must not exceed 9.0 mils (229 II. Film build conditions for reprocess BUCC is indicated by Target, Minimum or Maximum. Film builds for associated nontest layers are indicated by: T = Target H = Upper Limit L = Lower Limit 4.3.2 The above abbreviations will be used along with the cure abbreviations
20、to indicate panel prep conditions. For exam- ple, (T/H) means that panels will be prepared with target film upper limit bake. 4.4 BASIC TESTING. The following standard tests must be done on panel simulating both panel and spot re-process except as noted. Target re-process bake and films are used. Ex
21、cept for initial adhesion, test after a 72 h aging period. Exact panel details are shown in Table 1. 1. 2. 3. 4. 5. 6. 7. 8. 9. Tukon Hardness (ASTM D1274A) Mar Resistance. (Per engineering agreement, such as carpet test, car wash test, etc. Compare to a control panel re-process only). Initial Adhes
22、ion (GM9071P - Method B). (Cross- cut). There must be a minimum rating of 95% adhe- sion after 30 minutes cure at the minimum time/ temperature specified by the supplier. Moisture Resistance (GM4465P) + Adhesion. Gravelometer (GM9508P, Method A) - Minimum of 6 rating. Gravelometer (GM9508P, Room Tem
23、perature) - Minimum of 6 rating. Dime Scrape. No total peel or brittle flake off. Crack Cycle (GM9505P, Cycle A) - 15 Cycles. No cracking. Solvent Resistance (GM9509P). No removal after designated cure time. 4.5 CHEMICAL RESISTANCE (GM9533P). Compare etch- free temperatures to those of the controls
24、(target conditions, minimum film/cure). 4.6 QUV EXPOSURE (GM9125P) + 24 h HUMIDITY AND ADHESION. Evaluate 2500 h of total exposure. Compare gloss loss, color shift, and cracking. Performance must equal or exceed that of the control. After 24 h humidity, there must be no adhesion loss. Panel conditio
25、ns are: 4.6.1 Panel Re-process - Target Film/Cure 4.6.2 Panel Re-process - Minimum Film/Bake 4.6.3 Spot Re-process - Wedge, Target Cure 4.7 XENON EXPOSURE (SAE J1960 - EXTERIOR CYCLE + 24 h HUMIDITY AND TAPE ADHESION). Run sets 2500, 3500, and 4500 kJ exposure. Compare gloss loss, color shift, crack
26、ing, and humidity resistance. There must be a mini- mum of 75% gloss retention 2500 kJ. At 3500 kJ, there must be a minimum of 65% gloss retention and no significant color shift as compared to the control. At 4500 M, there must be no cracking or delamination at any interface. 4.7.1 Panel Re-process
27、- Target Film/Cure 4.7.2 Panel Re-process - Minimum Film/Bake 4.7.3 Spot Re-process - Wedge, Target Cure 4.8 FLORIDA EXPOSURE (GM9163P). Panels must be exposed for a total of 5 years. Samples must be returned after 12,24, and 36 months for additional gravelometer (GM9508P) and humidity/adhesion test
28、ing (GM4465P/GM9071P). New technologies must have a minimum of 24 months exposure history (including resin prototypes) prior to production release. There must be a minimum gravelometer rating of 6 at room temperature. There must be no adhesion loss or significant color shift as compared to the contr
29、ol. (NOTE: OEM panels are prepared with a 90 minute (T + 14C) bake. 4.8.1 Panel Reprocess - Target Film/Cure 4.8.2 Spot Re-process - Wedge, Target Cure 5 COMPATIBILITY. The re-process system must be compatible with typical materials it may contact. If there is a designated target plant, test with th
30、ose products selected for the plant If there is no designated target plant, use materials that are on the Approved Source List in the MATSPC computer system Adhesion after 96 h humidity and gmvelometer are the short term required unless otherwise specified. (See Table 2). 5.1 Compatibility with ELPO
31、 (9984094) 5.2 Compatibility with Surfacer (9984121) 5.3 Compatibility with Reprocess Primer (9984059) 5.4 Compatibility of Re-process Clearcoat with Baked OEM Clearcoat 0 COpyTight JUNE 1997 Generzd M0t0r.s CorptiOn All Rights R- 9984246 PAGE 2 JUNE 1997 Copyright General Motors North America Provi
32、ded by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:58:19 MDTNo reproduction or networking permitted without license from IHS -,-,- I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Paint I END OF LINE RE-PROCESS EC/CC SY
33、STEM 9984246 TABLE 2 Test Material I 998# I Fiiake I Re-process I Film/Bake I Test Material ELPO I 9984094 I T/T I BCYCC I MinMill I Humidity + Adhesion Surfacer 9984121 T/T T/H BCKC BCYCC MinfMin MinIMin Humidity + Adhesion Re-process Primer 9984059 T/WOW BC/CC Min/Min Max/Max Appear Humidity + Adh
34、esion OEM CC Variable T/H T/L cc ONLY MinIMin MinJMin Humidity + Adhesion Chip 6 PROCESSABILITY. The impact of process options frequently used in plants must be assessed, and parameter rela- tions must be established to understand if specific materials will fit a given plant process. These tests est
35、ablish if restric- tions or prohibitions are put on process options and also define the working range. Performance criteria for acceptable work- ing range is defined by the criteria for basic technology performance. The supplier must provide charts to demonstrate where performance starts dropping (M
36、inimum and maximum BC/CC films). 6.1 Re-process catalyst (or mix ratio) vs gravelometer. (Mm and max BC vs min and max CC ratios - target film, bake). 6.2 Re-process catalyst (or mix ratio) vs humidity + adhesion and appearance. (Min and max BC vs min and max CC ratios - target film, bake). 6.3 Re-p
37、rocess catalyst (or mix ratio) vs solvent resistance. (Mm and max BC vs min and max CC ratios - target film, bake). 6.4 Re-process catalyst (or mix ratio) vs weathering (Florida / Xenon). (Mm and max BC vs min and max CC ratios - target film, bake). 6.5 Cure time vs solvent resistance. 6.6 Cure time
38、 / temperature vs gravelometer. (Time and tem- perature). 6.7 Cure time / temperature vs humidity + adhesion (Min and max BC/CC films). 6.8 Cure time I temperature vs weathering (Florida / Xenon). (Min and max BC/CC films). 6.9 Cure time / temperature vs chemical resistance. (Mm and max BCKC films).
39、 6.10 CURE CHART. Data from the processing information obtained must be summarized into a cure chart. Minimum / maximum time at temperature must be established for mini- mum and maximum film builds recommended. 6.11 POT LIFE. The supplier must provide information on the pot life of the materials onc
40、e they are mixed. 6.12 FINBSSABILITY. The supplier must demonstrate pol- ishing capability by comparison to a control topcoat. Use 3M Final Finish material, 9982075. Prepare red and black panels at target film I target bake and high film / low bake. Evaluate visual marring as a function of bake. Als
41、o evaluate EOLR sys- tem panels at target conditions. 6.13 FINAL LINE RE-PROCESS AGE LATITUDE. Supplier must demonstrate that aging of the OEM material has no impact on the re-processability of the EOLR system (See Table 3). TABLE 3 OEM Film/Bake Aging FLR FiWBake Inltlal Adhesion Humidity Adhesion
42、LiH 2h T/T L/I-I 2 weeks T/T H/L 2h T/T WL 2weeks T/T 7 SOURCE SHIPMENT RESPONSIBILITY. It will be 8 INITIAL SOURCE APPROVAL. No shipment shall the responsibility of the supplier to insure that the material is be made by any supplier until representative initial production not exposed to temperature
43、s during shipment which would samples have been approved by engineering as meeting the cause the material to fail to meet any of the requirements of requirements of this specification. this specification. 0 Copyright JUNE 1997 Gene13 Motors Corporation Al Rights Reserved JUNE 1997 PAGE 3 9984246 Cop
44、yright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:58:19 MDTNo reproduction or networking permitted without license from IHS -,-,- I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes
45、- Paint I END OF LINE RE-PROCESS BClCC SYSTEM 9984246 8.1 Completed copies of the Material Safety Data Sheet meeting GM information requirements must be submitted with any new submissions or whenever a composition change has occurred. 9 INSPECTION AND REJECTION. All shipments of material or parts un
46、der contract or purchase order mamtfac- tured to this specification shall be equivalent in every respect to the initial samples approved by engineering. There shah be no changes in either formulation or manufacturing processes permitted without prior notification and approval by engineer- ing. Lack
47、of notification by the supplier constitutes grounds for rejection of any shipment. While samples may be taken from incoming shipments and checked for conformance to this specification, the supplier shall accept the responsibility for incoming shipments meeting this specification without depen- dence
48、 upon purchaser s inspection. In addition the supplier shall be responsible for submitting a CERTIFICATE OF ANALYSIS with each batch of material arriving at a plant. This document shall be prepared and provide data in accor- dance with the requirements detailed in GM4389M. 10 APPROVED SOURCES. Engin
49、eering qualification of an approved source is required for this specification. Only sources listed in the GM Materials File under this specification number have been qualified by engineering as meeting the requirements of this specification. Sources are available through the on-line MATSPC System. 11 GENERAL INFORMATION. This standard was originated by NAO Paint Engineering in April 1996. Q Copyright JUNE 1997 Gemd Motors Corporation Ail R