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1、- 900b379 0004749 83T GENERAL MOTORS ENGINEERING STANDARDS I Materlals and Processes - Paint ENHANCEDGLOSSBASECOATS 9984525 1 SCOPE. This specification covers the rquirenxnts for basecoats of varying technologies that have been enhanced to have sufficient gloss to be used without clearcoat on second
2、ary appearance areas. Gloss enhancement must be achieved by blending au unpigmented version of a given chemistty with its corresponding pipnted basecoat. 1.1 This specification defines 2 types of mskliak L)pe A: Unpigmnted basecoat blended with pigmented basccoat at the glm. Qpc B: Higher gloss base
3、coat supplied ready for use by blending normal hiding basecoat and unpigmented basccoat at the supplier s site 1.2 Application is limited to Class D or E areas per GM4364M, such as door facings or under hood and decklid. Use of this material must be spkkally authorized for indi- vidual vehicle lines
4、 via PAD. documents. Basecoats may be applied as a second coat over normal basecoat, or as the entire basecoat application if color match can be achieved and main- tained. 2 3 3.1 REFERENCED STANDARDS. GM4352M GM95 15P GM9896P GM4364M GM9516P ASTM D523 GM4465P GM962OM ASTM D1186 GM907lP GM9653P ASTM
5、 D2805 REQUIREMENTS. The mat&al must be identified as follows: a. Supplier Code, Batch b. MSDS C. Formula values for weight solids, volume solids, VOC, and density. d. viscosity c. Target blend ratio with piguxnted basecoat. f. 998xXxX of pigmented basecoat. 3.2 FILM BULD (ASTM D1186). Minimum fii o
6、f the blendis25CuaTargetis38Higherfilmbuildsmaybe required for specific technologies in order to meet abrasion tests and appeamnc&olor match v. . 3.3 BAKE. These mat&als must have the minimum b&s specified in individual 998xXxX s for the uninhanced basccoat lxw&al. 3.4 GLOSS (ASTM D523). Minimum of
7、60 at a 20 angle forQassDappeamnazonesasspecikdinGM4364M.Any platform exceptions will be noted in PADS. . 3.5 HIDING (ASTM D2805). Black and white hiding at 25 to 38 ltm is to be mported at target blend alone and in combi- nation with standard basecoat that has been baked. Use a mnt red metallic and
8、 light metallic (such as silver) for gulolic evahaation. 3.6 TABER ABRASER WEAR BESIST4NCE (GM95 15P). Wear is rated in reference to a control, which should be a solids basecoat approved for use in the same area without clean A basccoat/clearcoat system may be designated additional reference point b
9、y the responsible engineer. numbtr of cycles to rub through to primer. (Apply topcoat dimctly to any approved clectmdeposition primer). Test mate- rial should be equal to or better than the control, with minimum rating of 500 cycles. Test colors and fihn builds spe&edinTable 1. TABLE 1 - WEAR TEBTIN
10、G Test Color I Film Build I silver Met I 25&38um* Med Red Met Control Silver BC I 25&38pm* 23-25 um Control Red Met BC 23-25 pm Control BC/CC GM96XIM min BC O.fRWW 1 998XXXXminCC l Use target film build specified by supplier if different 38 w- 3.7 HUMIDITY AND TAPE ADHESION (GM4465P AND GM907lP, MET
11、HOD B). Evaluate silver and red metallic colors along with specified controls as indicated in Table Usetargetbsk,targctfllm,andtatgetblend 3.8 KEY PROCESS CONTROLS. The following informa- tion is to set processing windows for plant implementation. For technology testing, use red metallic and silver.
12、 3.8.1 Blend ratio of unpigmented to pigmented basecoat gloss (Qpe A materials). a Target blend b. Target less 10% unpigmented base. c Target plus 10% unpigmented base. 3.8.2 Black and white hiding (ASTM D2805) vs. blend (QpeAmatuiak). a Tatgetblend b. Tarcf less 10% unpi# base. c. Thrgct phts 10% u
13、npigmented base. 3.8.3 Black and white hiding (ASTM D2805) vs. blend (Qpe A materials) over baked starukd bamumt. a. Targetblend b. Target less 10% unpigmmted base. c. Target phrs 10% unpigmented base. 3.8.4 Bake versus abrasion resistance and MEK msistan target blend ratio per the following variabl
14、es (Type A and mflmiab): a. Targetbakc(T)withrcdmallicandsihwxEc. Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 22:54:35 MDTNo reproduction or networking permitted without license from IHS -,
15、-,- - 900b379 0004750 551 I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Paint I ENHANCEDGLOSSBASECOATS 9984528 b. (T - 85 C) with red rm%allic and silver metallic. c. (T - 14 C) with red mtallic and silver mtallic. 3.85 Intercoat adhesion of enhanced basecoat (target blend) over
16、 standard basecoat baked at target conditions (Type A and Bh a. Targetbake(T)withtedmetallicandsilvermetallic. b. (T - 85 C) with red mtallic and silver metallic. c. (T - 14 C) with red metallic and silver metallic. 3.8.6 Plant Specific CZompa&ility. Although these baamats aze intended for secondary
17、 surfaces only, the entire squena of topcoat processing must be evaluated on a plant by plant basis to determine extent of overspray/underspray and addi- tional plant specific conditions to evaluate. The responsible cnghwr will duuminc if the following tests apply, or if them lUCSny&iditiOllSlltCStS
18、tObClUIl. 3.8.6.1 A, HI. 3.8.6.2 3.8.6.3 3.8.6.4 3.8.6.5 3.8.6.6 3.8.6.7 Windshield bonding compatilility (GM4352M, Row Water dtflector adhesion. Label adhesion (GM9653P). Weathmtstaining(GM98!36P). Gloss, hiding - all colors. Adhesion to baked standard basea& - all colors. Appearan&dhesion of targe
19、t BC/CC over wedge of . . cllhanaa- 4 SOURCE SHIPMENT RESPCNSIBILITV. Itwillbctbemesponsl bilityofthestothatthe material is not exposed to tcmpclatlllcs during shipmult which would cause the material to fail to nmet any of the requite- mentsofthisspecification. 5 INITIAL SOURCE APPROVAL. No shipment
20、 shall be made by any supplier until npresentative initial production samples have been approved by engineering as meeting the requirements of this specification. 5.1 Completed copies of the GM Mat&al Safety Data Sheet and Critical Material Register (available from the engineering department or labo
21、ratory), or equivalent, must be submitted with any new submissions or where a composition change has 6 INSPECTION AND REJECTION. All shipments of material or parts under contract or purchase order manufac- tured to this specification shall be equivalent in evety respect totheinitialsamplesapprovedby
22、engineoring.Themshallbe no changes in either formulation or manufactming processes pcrmhd without prior noti6cation and approval by enginecr- ing. Lack of notification by the supplier constitutes grounds for rejection of any shipment. While samples may be taken hm incoming shipments and checked for
23、conformana to this specification, the supplier shall accept the responsibility for incoming shipments ra&ing this speciEdon without depen- dena upon purchaser s inspection. In addition the supplier shall be responsible for submitting a CERTIFICATE OF ANLYSIS with each batch of mamrial arriving at a
24、plant. ThisdocumemshaIlbepmpamdandprovidedatainaccord- ana with the rquircmcnts &tailed in GM4389M. 7 APPROVED SOURCES. Engincukg qualification of an approved source is mquired for this specification. Only sourceslistedintheGMMat&alsFileamderthisspeci6cation number have been qualified by engineering
25、 as meeting the requirements of this specification. Sources are available through the on-line MATSPC System. 8 GENERAL INFORMATION. This mndaxd was origi- natedbytheF aintQmmit&einAugust1992. Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/11111110
26、01, User=Japan, IHS Not for Resale, 06/23/2008 22:54:35 MDTNo reproduction or networking permitted without license from IHS -,-,- II 9006377 000475L 498 I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Paint ENHANCEDGLOSSBASECOATS 9984528 9984528 TEST CHECKUST *NOTE: Hiding is to be determined as per specific plant application. Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 22:54:35 MDTNo reproduction or networking permitted without license from IHS -,-,-