1、 FORD LABORATORY TEST METHOD BI 157-06 Date Action Revisions 2001 03 20 Revised Editorial no technical change A. Cockman 1996 10 02 Printed copies are uncontrolled Page 1 of 7 Copyright 2001, Ford Global Technologies, Inc. HIGH PERFORMANCE STONE CHIP RESISTANCE TEST NEW RATING SCALE Application This
2、 test method is used to determine the resistance of paint, on exterior body surface, to stone chipping. Apparatus Required Stone Chip Resistance Tester VDA Model 508 Source: Erichsen GmbH and Co. KG or Pearson Panke Ltd. D-5870 Hemer-Sundwig 1-3 Halegrove Gardens Germany London NW7 3LR England or eq
3、uivalent Evaluation Standards 8 black and white photographs Source: Central Laboratory Ford-Werke AG D-5000 Koln West Germany Test Panels Plane surface, prepared and painted in accordance with the applicable Engineering Material Specification, minimum dimension 200 x 100 mm. The coating thickness is
4、 to be determined according to FLTM BI 117-01 or as otherwise specified. Materials Required Chilled Iron Grit “Diamant“ Angular, 4 - 5 mm in size, rust free Source: Eisenwerke Wurth GmbH D-7101 Bad Fredrichshall/Jagstfeld Germany FORD LABORATORY TEST METHOD BI 157-06 Page 2 of 7 Copyright 2001, Ford
5、 Global Technologies, Inc. Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise speci
6、fied. Procedure 1. Age test panels according to applicable Engineering Material Specification. 2. Grit blast the test panels for a period of 30 to 35 seconds with 2000 g of the grit using an air pressure setting of 2 bar at 23 +/- 2 C. 3. Perform water immersion test according to BI 104-01 for 72 ho
7、urs. 4. Repeat the grit blasting as specified under procedure 2 within one hour of removing the panel from water immersion. 5. Evaluate by comparison with Evaluation Standards Photographs. 6. All chipping shall be reported. Where possible identify and record the plane in the paint layers where chipp
8、ing occurs. General Information 1. For special tests (e.g.) initial sample, perform the test in triplicate and report the average result. 2. The stone chip resistance equipment shall be standardized periodically for effectiveness. If necessary, the air pressure shall be adjusted to correlate with th
9、e standards on file at the Materials Laboratory of Product Engineering. 3. To avoid aerodynamic resistance ensure that the end of the flexible outlet has a ground clearance of at least 50 mm. 4. Ensure that the grit will produce consistent results. Check grit weight before starting test and subseque
10、ntly, every 25 cycles, remove used grit to give a weight of 1950 g and make up weight to 2000 g with new grit. Where loss in use reduces the weight to less than 1950 g do not remove any used shot but make up to 2000 g. Chemicals, materials, parts, and equipment referenced in this document must be us
11、ed and handled properly. Each party is responsible for determining proper use and handling in its facilities. FORD LABORATORY TEST METHOD BI 157-06 Page 3 of 7 Copyright 2001, Ford Global Technologies, Inc. HIGH PERFORMANCE STONE CHIP RESISTANCE TEST FORD LABORATORY TEST METHOD BI 157-06 Page 4 of 7
12、 Copyright 2001, Ford Global Technologies, Inc. HIGH PERFORMANCE STONE CHIP RESISTANCE TEST FORD LABORATORY TEST METHOD BI 157-06 Page 5 of 7 Copyright 2001, Ford Global Technologies, Inc. HIGH PERFORMANCE STONE CHIP RESISTANCE TEST FORD LABORATORY TEST METHOD BI 157-06 Page 6 of 7 Copyright 2001, Ford Global Technologies, Inc. HIGH PERFORMANCE STONE CHIP RESISTANCE TEST FORD LABORATORY TEST METHOD BI 157-06 Page 7 of 7 Copyright 2001, Ford Global Technologies, Inc. HIGH PERFORMANCE STONE CHIP RESISTANCE TEST
