1、 FORD LABORATORY TEST METHOD BV 108-01 Date Action Revisions 2000 12 11 Revised Editorial no technical change A. Cockman 1990 06 27 Printed copies are uncontrolled Page 1 of 2 Copyright 2000, Ford Global Technologies, Inc. VOLUME CHANGE OF SEALERS Application This procedure is used to determine the
2、volume change of sealers occurring as a result of natural or forced drying. Apparatus Required Mechanical Convection Oven Capable of maintaining a constant temperature of 70 +/- 2 C. Analytical Balance Accuracy +/- 0.1 mg. Non-Ferrous Screen Aluminum or copper 30 mm wide by 40 mm long with approxima
3、tely 6 - 7 openings per cm. Materials Required Ethyl Alcohol CAUTION: Low flash point. Refer to Industrial Hygiene for health and safety comments. Distilled or Deionized Water 20 micromhos/cm at 25 C maximum conductivity (ASTM D 1125). Conditioning and Test Conditions All test values indicated herei
4、n 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. FORD LABORATORY TEST METHOD BV 108-01 Page 2 of 2 Copyright 2000, Ford Global Technol
5、ogies, Inc. Procedure 1. Weigh the screen in air (W1), then in water (W2) at 23 +/- 2 C (see Note). 2. Apply 3 - 5 g of sealer to the screen and spread with a spatula to a uniform thickness. 3. Weigh screen and sample in air (W3), then in water (W4). 4. Suspend the screen containing the sample in th
6、e oven at 70 +/- 2 C for 70 h. 5. Remove from the oven and cool to 23 +/- 2 C for 1 h. 6. Weigh screen and sample again in air (W5), then in water (W6) at 23 +/- 2 C. Evaluation Calculate the percentage volume change of the sealer as follows: (W3 W1) - (W4 W2) - (W5 W1) - (W6 W2) Volume change % = x
7、 100 (W3 W1) - (W4 W2) Note: Positive result = Volume loss Negative result = Volume gain Where: W1 = Weight of screen in air. W2 = Weight of screen in water. W3 = Weight of screen plus sample in air. W4 = Weight of screen plus sample in water. W5 = Weight of screen plus sample in air after oven expo
8、sure. W6= Weight of screen plus sample in water after oven exposure. Note: It is important that no air bubbles are clinging to the test specimen during the weighing in distilled water. This is accomplished by dipping the specimen in ethyl alcohol and again in distilled water before weighing. 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.
