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 2 NAVISTAR, INC. CEMS (CORPORATE ENGINEERING MATERIAL SPECIF
2、ICATION) NUMBER: CEMS GT-4D TITLE: Hardness Of Paint 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 specification may involve haz
3、ardous 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 prior to use. Change Notice
4、 Replaced “International Truck and Engine Corporation” with “Navistar, Inc.” per corporate directive. 1.0 SCOPE This is a method for determining the hardness of a dry film of paint. 2.0 APPARATUS 2.1 Recirculating oven capable of maintaining a temperature of 50 + 2 C (120 + 5 F). 2.2 Leads ranging
5、in hardness from 5B to 6H and lead holder. Eagle-Turquoise, or equivalent. 3.0 MATERIAL 3.1 Bonderite CD-10 or Bonderite 958 zinc phosphated steel panels, 100 x 150 mm (4x6 inches), available from Advanced Coatings Technologies Inc., P.O. Box 401, 273 Industrial Drive, Hillsdale, Michigan 49242: Tel
6、ephone No. (517) 439-1485. OR Fiber glass reinforced plastic panels available from Truck Development and Technology Center, Materials Engineering, P.O. box 1109, Ft. Wayne, Indiana, 46801-1109: Telephone No. (219) 461-1244. 3.2 No. 1 emery paper. 4.0 PROCEDURE 4.1 Prepare the appropriate quantity an
7、d type of panels for the grade of paint being tested according to the procedure specified in Test Method GT-13, Panel Preparation. For Grades 50, -52, -52W,-52HS, -53, -53A, and 56, proceed up to but not including the step in which the primed and dried panels are sanded. 4.1.1 Two steel panels Grade
8、s 17, -17HS, -18, -19, -19HS, -29, -29HS, -29T, -29THS, -32, -32HS, -32HS/Ur, -41, -43 50, -54, -55, -55W, -56, -62, -81, -81HS, -81W, -82W, and -83W. 4.1.2 Four steel panels Grades 53 and 53A. 4.1.3 Two fiber glass reinforced plastic panels Grade 52, -52HS, or 52W. Copyright Navistar International
9、Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: CEMS GT-4D TITLE: Hardness Of Paint CURRENT ISSUE DATE: August 2009 This document is restricted and may not be sent outside Navistar, Inc. or reproduced wit
10、hout permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2009 by Navistar, Inc. AUGUST 2009 Page 2 of 2 For grades where four panels are prepared, two alternative drying procedures, an air dry and an oven dry, are specified. For these grades, two pan
11、els will be dried according to the air drying panels will be dried according to the oven drying procedure. For grades where two panels are prepared, only one drying procedure is specified for these grades, both panels will be dried according to this procedure. 4.2 For Grades 17, -17HS, -18, -19, -19
12、HS, catalyzed 19 and 19HS, -19, -29HS, -29T, and -29ThS, test the hardness immediately after the panels have been prepared. For all other grades, age the prepared panels for 72 hours in a recirculating oven at 50 + 2 C (120 +5 F), remove and cool to 21 to 27 C(70 to 80 F) prior to testing. 4.3 Squar
13、e off the hardest (6H) pencil on No. 1 emery paper and insert into a lead holder so that no more than 5 mm (0.2 inch) of lead projects beyond the end of the holder. 4.4 Place the lead in contact with the painted surface and at a 45 degree angle to it. Push the holder firmly forward inch with approxi
14、mately equal downward and forward pressure. 4.5 Examine the panel with the unaided eye to determine if the lead has cut through the paint film to either bare metal or a previous layer of paint for a distance of at least 1/8 inch. If the lead has not cut the paint, then record the hardness of the pai
15、nt as 6H: it has, repeat steps (3), (4) and (5) using the next softer lead, 5H. 4.6 Proceed through the following sequence of successively softer leads until a lead that does not cut the paint is found: 6H, 5H, 4H, 3H, 2H, H, F, HB, B, 2B, 3B, 4B, 5B. 4.7 Record the hardness of the paint for each of
16、 the panels. For those grades where two panels are prepared, both will be tested. For those grades where four panels are prepared, both air dried and both oven baked panels will be tested. 5.0 REPORT Report the minimum hardness value obtained from all the panels tested. Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
