《GMNA-9982075-1993.pdf》由会员分享,可在线阅读,更多相关《GMNA-9982075-1993.pdf(2页珍藏版)》请在三一文库上搜索。
1、- =lOOb379 OOOL970 43T m I GENERAL MOTORS ENGINEERING STANDARDS I Materiais and Processes - Paint POLISHING COMPOUND, FOR ENAMEL 9992075 1 SCOPE. This specification covers the requimments for polishing compounds used to restore the gloss of enamel finishes. Typically these compounds are used with ro
2、tary fin- ishing machines to remove the sanding scratches incurred during the first step of finesse repair operations. Objectionable haze or fine swirl marks from this operation are then removed by using buffing compounds covered under specification 9982074, using orbital finishing machines. 2 REFER
3、ENCED STANDARDS. GM4352M GM952OP GM4465P GM9522P GM9071P 9981062 9981293 9982014 3 REQUIREMENTS. Documentation covering all mate- rial properties and performance test results must be supplied in a form acceptable to the GM Engineering activity to which submission is made. Any significant change made
4、 to the mate rial components or manufacturing process must be assessed to determine if requalification is required. 3.1 MATERIAL REQUIREMENTS. The following require- ments am for the polish material as receivedz 3.1.1 Identification. All materials must have complete identi- fication by product code
5、and manufacturing batch. All requited safety/hygiene information per Section 3.2.3.2 must bc fur- nished. 3.1.2 Consistency. The material must be free of lumps and show no tendency to settle. Any sensitivity to freezing must be clearly identified. 3.1.3 Odor. The material s odor shall be reviewed in
6、 compar- ison with current production materials, when evaluated in laboratory and production trials. Any changes in formulation must be reassessed for effect on odor. 3.1.4 Ingredients Injurious to the Paint Process. The polish must not contain any ingredients which upon becoming air- borne during t
7、he polishing process may cause paint cratering or other dctrimcntal effect on paint or assembly Processes. 3.15 Swirl Mark Fii Ingredients. The polish must not contain any waxes, oils or otber iugmdients which temporarily fill fine scratches and swirls. Such materials hide the presence of such defec
8、ts, which subsequently reappear when the mate- rial is washed away or removed. 3.2 F ERFORMANCE REQUEEMENT S. The following requirements apply to the use of the material in the Polishing process to perform its intended function, and its effect on the paint finish being polished. Testing shall be con
9、ducted on freshly painted panels which arc aged no longer than in the intended plant process. Qualification of a polish to these requirements allows its use only with the topcoats used in the initial test program. Use with other topcoats requires retesting to the applicable performance requirements.
10、 3.2.1 Polishing Performance. Using the intended polishing process, equipment and allotted time, the polishing material must be capable of removing finesse sanding scratches and restoring the paint finish to specified gloss levels. Any swirl marks must bc capable of being quickly removed using the a
11、pproved 9982074 buffing material and process. Laboratory testing must always be performed in conjunction with a control polish to compare efficiency and observe subtle appearance differences. Allowed polishing time in laboratory tests must duplicate the intended plant process. Final approval of any
12、material is contingent upon successful production trials. 3.2.2 Effect on Topcoat Performance. The polish material must not affect the durability of the enamel finish in any way. The ingredients of the material will bc reviewed for their potential effects on the topcoat such as surface degradation a
13、nd crack resistance. Appropriate testing will be initiated as required with white and light metallic colors. 3.2.3 Effect on the Paint Repair Process. The polish, used and removed in the specified polishing process, shall not be detrimental to the repair painting process. Panels shall be pol- ished
14、with the material between 1 h and 24 h after bake using the intended plant process. Prior to application of the repair paint, the polished panel may be wiped with Naphtha (9981062) or Isopropyl Alcohol (9981293). No other solvent or cleaning procedure is allowed. The repair finish must exhibit the f
15、ollowing 3.2.3.1 Appearance. No cratering or other effect detrimental to appeamnce is allowed. 3.2.3.2 Adhesion (GM9071P, Method A) No reduction or loss of adhesion of repair paint from original paint. 3.2.3.3 Humidity Resistance (GM4465P). Following expo- sure for 96 h, the repair paint shall exhib
16、it no blistering or loss of adhesion per 33.3.2. 3.24 Affect on Glass Bonding. Polishing operations per- formed in the paint shop may result in deposition of polish residues on glass bonding surfaces. When tested as indicated below, the polish shall exhibit no adverse effect on the glass bonding pro
17、cess or durability. For qualification, testing shall be with representative glass bonding primers and adhesives. Release of the polish material to a plant using other glass bonding materials requires retesting with the specific plant s mate&h per GM4352M, Row I. 3.2.4.1 Panel Reparation. Monocoat (n
18、onclearcoat) enamels require testing with white and light blue metallic colors. Basecoat/clearcoat enamls require white only. Topcoat shall be applied at nominal fii build and baked for 25 minutes at target temperature. Three polish conditions on panels will be tcstedz a Control - no polish b. Apply
19、 76 m (approx. 5 cc) wet polish - air dry 30 minutes - wipe one pass with dry cloth, leaving visi- ble dry polish residue APRIL 1993 PAGE 1 9982075 Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/20
20、08 20:39:06 MDTNo reproduction or networking permitted without license from IHS -,-,- W 9006379 0001971 376 m I GiNERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Paint I POLISHING COMPOUND, FOR ENAMlEL 9982075 c. Apply 76 p (approx. 5 cc) wet polish - air dry 30 minutes - wipe one pas
21、s with cloth dampened with Naphtha 9981062 - wipe one pass with dry cloth Apply the glass bonding primer and adhesive and allow to age at room temperature for 72 h before testing. 3.2.4.2 Glass Bonding Tests. There shall be no evidence of cratering or crawling of the glass bonding primer on the pol-
22、 ished panels. Following the tests below, bond stmngths on the polished panels shall be quivalent to those obtained on the unpolished control panels. a. Tape Link-Up Test (GM952OP) b. Quick Knife Adhesion (GM9522P). Initially and fol- lowing 168 h humidity exposure per GM4465P 4 SOURCE SHIPMENT RESP
23、ONSlBILlW. It will be the responsibility of the supplier to insure that the material is not exposed to temperatures during shipment which would cause the material to fail to meet any of the requim- ments of this specification. 5 INITIAL SOURCE APPROVAL. No shipment shall be made by any supplier unti
24、l representative initial production samples have been approved by engineering as meeting the requirements of this specification 5.1 Compkted copies of the GM Material Safety Data Sheet and critical Material Register (available from the engineering department or laboratory), or equivalent, must be su
25、bmitted with any new submissions or where a composition change has oualmxl. 6 INSPECTION AND REJECTION. All shipments of material or parts under contract or purchase order manufac- tured to this specification shall be equivalent in every respect to the initial samples approved by engineering. There
26、shall be no changes in either formulation or manufacturing proasses permitted without prior notification and approval by engineer- ing. Lack of notification by the supplier constitutes grounda for rejection of any shipment. While sampks may be taken from incoming ship and checked for conformana to t
27、his specification, the supplier shall accept the responsibility for incoming shipments Illceting this specification without depen- dence upon purchaser s inspection. In addition the supplier shall be responsible for submitting a CERTIFICATE OF ANALYSIS with each batch of material atriving at a plant
28、. Thisd ocument shall be prepared and provide data in accord- ana with the requirements detailed in GM4389M. 7 APPROVEDSOURCES. Engineering qualification of an approved source is required for this specification. only sources listed in the GM Materials Fiie under this specitication number have been q
29、ualified by engineering as meeting the requirements of this specification. Sources are available through the on-line MATSPC System 8 GENERAL INFORMATION. This standard was origi- nated by the Paint Materials Specification Committee in March 1991. The latest revisions include: Rev Date Description MV A 11192 GM4352M consistency PT 9982075 PAGE 2 APRIL 1993 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 20:39:06 MDTNo reproduction or networking permitted without license from IHS -,-,-
链接地址:https://www.31doc.com/p-3767799.html