1、 FORD LABORATORY TEST METHOD EU-BS 002-01 Date Action Revisions 2000 11 10 Revised Editorial no technical change A. Cockman 1994 02 28 Printed copies are uncontrolled Page 1 of 3 Copyright 2000, Ford Global Technologies, Inc . WARP TEST ON CELLULOSE FIBRE BOARDS Application This method is used to de
2、termine the form stability characteristics of semi - waterproof boards, bitumen impregnated boards, cellulose fibre hardboards, etc., after water immersion. Apparatus Required Warp Test Fixture (see Figure) Steel Rod 12 mm diameter, 150 mm long. Water Bath Containing distilled water. Size must be su
3、itable to permit total immersion of test specimen. Wire Screen Fine mesh stainless wire. Conditioning and Test Conditions All te st 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 te
4、sting and tested under the same conditions unless otherwise specified. Procedure 1. Cut two test specimens each 150 x 430 mm, from the material under test, one in the longitudinal direction, and the other in the transverse direction. 2. Cut a 12 mm wide x 50 mm deep slot in the centre of one of the
5、150 mm sides of each specimen. FORD LABORATORY TEST METHOD EU-BS 002-01 Page 2 of 3 Copyright 2000, Ford Global Technologies, Inc. P lace the specimen in the fixture and move the adjustable bracket forward so that the length of the test specimen exposed between the two brackets of the fixture (the m
6、ovable and the fixed one) is 400 mm, and tighten the wing nut. Place the 12 mm diameter steel rod on the free end of the test specimen, which will prevent this end of the specimen from curling up but will allow free movement in warping during water immersion. 3. Immerse the fixture and test specimen
7、 on wire screen in distilled water bath at 20 +/ - 2 C, for the period of time required by the Engineering Material Specification and in such a way that the upper side of the test specimen lies 25 mm beneath the surface. 4. Remove the test specimen from the water and measure the maximum height to wh
8、ich the specimen has risen from the base plate of the fixture. 5. Repeat the test on the other specimen which was cut in the opposite direction. Evaluation Calculate the percentage warp in both the longitudinal and transverse direction, according to the following formula: Warp % = Maximum Height x 1
9、00 400 mm Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its faci lities. FORD LABORATORY TEST METHOD EU-BS 002-01 Page 3 of 3 Copyright 2000, Ford Global Technologies, Inc. WARP TEST ON CELLULOSE FIBRE BOARDS
