1、This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2010 Navistar, Inc. FEBRUARY 2010 Page 1 of 3 NAVISTAR, INC. CEMS (CORPORATE ENGINEERING MATERIAL SPECIFI
2、CATION) NUMBER: CEMS G-5, Part II Grade -20 TITLE: Part II Paint Topcoats, Grade 20 CURRENT ISSUE DATE: February 2010 WRITTEN/REVIEWED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES ISSUE OF: December 2007 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION
3、 This specification may involve hazardous materials, equipment, and procedures. This specification does not purport to address all of the safety issues associated with its use. The user is responsible to consult appropriate safety and health practices and to determine the applicability of regulatory
4、 limits prior to use. Change Notice: Replaced “International Truck and Engine Corporation” with “Navistar, Inc.” per corporate directive; Changed cyclic corrosion test from GM 9540P, Method B to CEMS GT-7D. 1.0 APPLICATION This specification covers all thermosetting acrylic, epoxy, polyester, epoxy-
5、polyester hybrid, and polyurethane powders. It is intended for electrostatic spray or fluidized bed application over such substrates as cold rolled steel, zinc die cast, chrome plated steel, die cast aluminum, galvanized steel and stainless steel parts, or other substrates. This specification covers
6、 materials to be used as primers providing corrosion protection under another topcoat system, as well as a topcoat with zinc phosphated rounded-edge sheet and molded parts, or as a topcoat on cathodic electrodeposited primer. 2.0 SCOPE This specification covers the chemical, physical, source approva
7、l, application procedure, and quality control requirements for a thermosetting type powder coating. 2.1 Restricted Chemical Substances Effective January 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the CEMS B-50 specification 3.0 REQUIR
8、EMENTS 3.1 Material 3.1.1 The paint shall be in powder form. 3.1.2 Specific Composition. When it is necessary to obtain specific data regarding powder coating formulations, suppliers will furnish such data on request. 3.2 Film Thickness (ASTM D 1186). All durability and appearance requirements must
9、be met within a minimum range of 38 to 102 m (1.54 to 4 mils). Film build not to exceed 102 m (4 mils) including inline repairs. Individual colors may have narrower ranges for optimum appearance. Individual colors may also have higher film builds than the technology minimum due to hiding or ultravio
10、let opacity. 3.3 Bake. The target bake for these powders is 20 minutes metal temperature 157 to 216 C (315 to 420 F). Supplier shall provide bake time and temperature charts showing the bake processing window wherein all performance requirements are met. Copyright Navistar International Corporation
11、Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: CEMS G-5, Part II Grade-20 TITLE: Part II Paint Topcoats, Grade -20 CURRENT ISSUE DATE: FEBRUARY 2010 This document is restricted and may not be sent outside Navistar,
12、Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2010 Navistar, Inc. FEBRUARY 2010 Page 2 of 3 3.4 Particle Size. Significant differences in particle size may affect the handling and appearance of powder coatings. Suppli
13、er shall identify particle size and distribution per ASTM D 3451, Section 8.4. Electronic Counting Analysis is the preferred methodology. 3.4.1 Volatile Content. Although powders are nominally 100% solids at room temperature, some volatiles may emanate during the baking process. Mass percent solids
14、and volatile content shall be determined by using ASTM D 3451, Section 13. 3.4.2 Density and Specific Gravity. Apparent density and its bulk factor shall be determined in accordance with ASTM D 1895. For specific gravity determinations, use ASTM D 153 or with modifications described in ASTM D 3451,
15、Section 18. 3.4.3 Gel Time. The mean gel time of the product shall be in accordance with ASTM D 3451, Sec. 14. 3.4.4 Quality Control. The supplier must provide a listing of quality control policies and procedures for both raw and finished materials. 3.5 Appearance Matrix. Production representative e
16、lectrostatic powder guns shall be used. Report fluidizing air pressure, electrostatic voltage, feed, and conveyance (or equivalent) air pressures, and powder flow in oz(lb)/min. 3.5.1 Fluidization Characteristics. Evaluate the fluidization of the powder at different fluidization air pressures, parti
17、cle size distributions, and humidity levels. The fluidization system used must be production representative. 3.5.2 Flow and Sintering Characteristics. Using a gradient bar oven at target film builds, determine the time versus temperature profiles for flow and sintering properties. 3.5.3 Heat-Up Rate
18、. Supplier shall demonstrate the effect the heat-up rates will have on appearance of the final coating. Also, the supplier will demonstrate whether an interrupted bake, as may occur at breaks or shift changes, affects appearance attributes. 3.5.4 Gel Time/Tack Free. Determine the amount of time need
19、ed to achieve a tack free surface when temperature is at the target bake. This may be accomplished using ASTM D 3451. 3.5.5 Package Stability. To address unique characteristics of the powders bulk handling needs, package stability with respect to heat and moisture exposure shall be established per A
20、STM D 3451 modified as necessary to stimulate shipping procedures. for sections 4.0, 5.0, 7.0, 8.0, 9.0, 10.0, and 11.0; see Part II General Requirements Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted withou
21、t license from IHS-,-,-NUMBER: CEMS G-5, Part II Grade-20 TITLE: Part II Paint Topcoats, Grade -20 CURRENT ISSUE DATE: FEBRUARY 2010 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to a
22、ssume all patent liability. 2010 Navistar, Inc. FEBRUARY 2010 Page 3 of 3 6.0 PROPERTY REQUIREMENTS 6.1 Dry Film Properties DRY FILM PROPERTIES POWDER PRIMER POWDER TOPCOAT All Colors Test Designation (b) Initial Gloss (a) 20 Degrees, min - 83 CEMS GT-6B 60 Degrees, min 80 90 South Florida Exposure
23、(c) Gloss 20 min 18 Mo. - 73 CEMS GT-7F 60 min 18 Mo. - 80 Surface Condition After 18 Months - Pass Color Change After 18 Months Exposure & Polish - Pass Hiding Power Required, min (a) mils 1.54 1.54 ASTM D1186 m 38 38 Curing Properties on Receipt, 20 Minutes at 315 - 420 F (a) Pass Pass CEMS GT-22
24、Color Stability (a) No Color Change, 4 Point change in 20 Gloss max No Color Change, 4 Point change in 20 Gloss max CEMS GT-4B Hardness, min (a) 3H 3H CEMS GT-4D Bleeding Pass - CEMS GT-4J Adhesion, % min 90 90 CEMS GT-5A Intercoat Adhesion Tape Appearance Pass Pass CEMS GT-5B Feather Edge Appearanc
25、e Pass Pass Color (a) Pass Pass SAE J1545 Gravelometer Rating 2A, 4A, or 4B as applicable per CEMS GT-28 2A, 4A, or 4B as applicable per CEMS GT-28 SAE J400 Salt Spray, 500 Hours Exposure Dry Film Appearance Pass Pass CEMS GT-7D Corrosion Creepage, max inch 0.03 (Aluminum, Cold Rolled Steel) 0.03 (A
26、luminum, Cold Rolled Steel) mm 0.8 (Aluminum, Cold Rolled Steel) 0.8 (Aluminum, Cold Rolled Steel) Cyclic Corrosion 60 Cycles Dry Film Appearance Pass All Metals Pass All Metals CEMS GT-7D Corrosion Creepage, max inch 0.03 All Metals 0.03 All Metals mm 0.8 All Metals 0.8 All Metals Humidty, 500 Hour
27、s Exposure Pass Pass CEMS GT-7E Xylol Rub Pass Pass CEMS GT-14A Acid Spot Pass Pass CEMS GT-14B Orange Peel 4.5 4.5 CEMS GT-29 (a) Most suitable for acceptance testing. (b) All test designations refer to the latest issue unless otherwise stated. (c) Paint supplier will provide 18-month South Florida
28、 panels on product submitted for testing. Navistar, Inc. will conduct accelerated weathering testing utilizing Method D per TMS 9554 for conditional approval. Navistar, Inc. will send test panel to South Florida to verify vendor panels before issuing final approval. QUV Testing Cycle 750 hours 8 Hou
29、rs Ultraviolet Light 60 C(140 F) 4 Hours Condensation 50 C(122 F) 8 Hours Ultraviolet Light 60 C(140 F) 4 Hours Condensation 50 C(122 F) 6.2 Test Panel Requirements The number, type, and size of test panels required for each test is described in CEMS GT-13. Prepare test panels using Method M per CEMS GT-13. Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
