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. 2009 by Navistar, Inc. AUGUST 2009 Page 1 of 1 NAVISTAR, INC. CEMS (CORPORATE ENGINEERING MATERIAL SPECI
2、FICATION) NUMBER: CEMS GT-21 TITLE: Curing Properties On Receipt - Air Drying CURRENT ISSUE DATE: August 2009 WRITTEN/REVIEWED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES ISSUE OF: August 2001 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION This spec
3、ification 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 limits pr
4、ior to use. Change Notice: Replaced “International Truck and Engine Corporation” with “Navistar, Inc.” per corporate directive. 1.0 SCOPE This is a method for determining the air drying properties of an organic coating. 2.0 APPARTUS A Gardner 3-speed BK Drying Time Recorder (or equal); available fro
5、m Paul N. Gardner Company, Station 9, P.O. Box 6633, Fort Lauderdale Florida 33316. 3.0 MATERIAL 25 X 300 mm (1 X 12 inches) panels which may be glass or other suitable material. 4.0 TEST CONDITIONS Make all measurements at an average temperature of 25 5 C (77 9 F) 5.0 PROCEDURE 5.1 Prepare two pane
6、ls according to the method specified for the grade being evaluated in CEMS Test Method GT-13, Panel Preparation. 5.2 Immediately after paint is applied to the specified thickness, as shown on the applicable grade sheet from CEMS GT-13, Panel Preparation. 5.3 Start drying time recorder and place styl
7、us on appropriate panel. No additional weight will be applied to the stylus. 5.3.1 Drying time recorder has three scales: 65, 12, 24 hours, use sale that approximates the drying time of paint under test. 5.4 The drying stages are as follows: 5.4.1 The first stage is a pear-shaped impression correspo
8、nding to the time taken for evaporation of solvent. 5.4.2 The second stage is the cutting of a continuous track, corresponding to the sol-gel transition. 5.4.3 The third stage is an interrupted track corresponding to the surface drying time. 5.4.4 The fourth stage is where the stylus travels on the
9、surface of the paint film and leaves a slightly perceptible mark. 6.0 REPORT The drying time is reported as the time when the stylus leaves only a slightly perceptible mark on the surface. Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
