1、 FORD LABORATORY TEST METHOD BO 129-01 Date Action Revisions 2001 03 28 Revised Editorial no technical change A. Cockman 1992 04 24 Printed copies are uncontrolled Page 1 of 2 Copyright 2001, Ford Global Technologies, Inc. WATER IMMERSION - DIMENSIONAL STABILITY OF ELASTOMERS AND PLASTICS This proce
2、dure is used to determine the dimensional stability of elastomers and plastics used in the construction of various automotive parts subjected to prolonged exposure to moisture. Apparatus Required Drying Oven A mechanical convection oven maintained at a temperature of 80 +/- 2 C. Tank Size shall be s
3、ufficient to totally submerge the sample in water. Scriber - Carbide Tip Source: GTS (General Scriber #CM 88) 12015 Telegraph Detroit, Michigan Rule GTS Starrett C335S - 300 or equivalent. Desiccator Curtin Matheson Scientific Catalog No. 109-124 or equivalent to hold 305 mm test pieces. Conditionin
4、g 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 specified. Procedure 1. Prepare a sample te
5、st bar 300 x 50 mm x nominal part thickness. When the configuration and the size of the part or plaque permits, two samples should be prepared with the 300 mm dimension of one sample at a 90 orientation to that of the second sample. 2. Dry the sample in the oven for 16 hours at 80 +/- 2 C unless oth
6、erwise specified in the material specification. FORD LABORATORY TEST METHOD BO 129-01 Page 2 of 2 Copyright 2001, Ford Global Technologies, Inc. 3. Remove the sample from the oven and immediately place in a desiccator for one hour, allowing the sample to cool to 23 +/- 2 C. 4. Remove the sample from
7、 the desiccator and mark off a 250 +/- 0.25 mm length on the sample. 5. Promptly immerse the sample in a water bath that has been conditioned to 23 +/- 2 C. 6. After immersion for the time required by the material specification, remove the sample from the water and immediately measure the marked off
8、 portion to the nearest 0.25 mm. Note: The sample should be held flat when being measured. 7. Calculate the expansion of the sample as follows: Expansion = L f - L i Li Where: Li = length Lf = final length 8. Report the expansion in mm/mm and the time of immersion. 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 facilities.
