1、 FORD LABORATORY TEST METHOD BU 014-02 Date Action Revisions 2000 11 13 Revised Editorial no technical change A. Cockman 1992 08 10 Printed copies are uncontrolled Page 1 of 4 Copyright 2000, Ford Global Technologies, Inc. FLOW CHARACTERISTICS OF WINDSHIELD AND BACKLIGHT BONDING TAPE Application Thi
2、s procedure is used to describe the “flow -out“ behavior of bonding tape. The height of tape and amount of flow is determined after the specified time, temperature and load. Material Required Bonding Tape Samples of tape 3 inches long with the cross section specified on the affected Engineering draw
3、ing. Samples shall be uniform in cross section over the entire 3 inch length +/ - .005 inch. Glass Plate 3 x 3 x 0.25 inch flat polished plate glass shall be used. Equipment Required Test Assembly The glass plate and the bonding tape shall be combined to provide the test assembly as shown in Figure
4、1. Weight A 1.5 +/ - 0.1 lb weight (3 x 3 inch square). Oven A mechanical convec tion oven capable of maintaining a temperature of 190 +/ - 2 F. Spacer A 3 x .500 x .200 inch +/ - .002 inch steel spacer is necessary for maintaining the minimum height of the compressed test assembly. Thickness Gage A
5、 standard bench thickness gage havin g a total capacity of at least 3 inches, graduated in .001 inch divisions. The gage shall be equipped to provide a 2 oz load over a minimum contact area of 1/4 square inch. Gages of this type may be obtained from Federal Products Corp. FORD LABORATORY TEST METHOD
6、 BU 014-02 Page 2 of 4 Copyright 2000, Ford Global Technologies, Inc. Hydraulic Press A laboratory press, Pasadena Hydraulic, Inc., Model PWOS 220, or equivalent, is required to compress the bonding tape to the proper material thickness. Stop Watch A stop watch shall be used to measure the timed int
7、ervals specified in the procedure. 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 other
8、wise specified. Procedure Note: All test specimens shall be conditioned for a minimum of 16 h at 72 +/ - 2 F and 45 - 65 % relative humidity prior to testing. The testing procedure shall also be performed under these environmental conditions. 1. Using the thickness tester, measure the combined heigh
9、t of two pieces of glass plate to the nearest 0.001 inch under a 2 oz load and mark the mating surfaces. Note: A micrometer may be used. 2. Place the spacer (.200 inch) between the glass plates cent ered between the two ribbons of bonding tape in accordance with Figure 1. 3. Center the assembly on t
10、he base plate of the laboratory press. 4. Compress the sample to a total bonding tape thickness of 0.200 +/ - .002 inch using the hydraulic press, and hol d in this position for 1 minute. The maximum load on the sample shall not exceed 500 lbs force. 5. Take the sample out of the press, remove the s
11、pacer and add the 1.5 lb weight. 6. One hour +/ - 5 minutes after adding the 1.5 lb weight, remove the weight and measure the combined thickness of the glass and tape, using the thickness gage. Replace the weight. Calculate the rebound height of the tape, using the following method: R = Tx - T G R =
12、 Rebound height Tx = Combined glass and tape thickness a t time specified T G = Combined glass thickness as determined in Step 1. 7. Place the sample (with weight) in a mechanical convection oven maintained at 190 +/ - 2 F for a period of 24 h. FORD LABORATORY TEST METHOD BU 014-02 Page 3 of 4 Copyr
13、ight 2000, Ford Global Technologies, Inc. 8. Remove the sample from the oven and allow to recover (with we ight) at 23 +/ - 2 C for 1 h. 9. After 1 h, remove the weight, measure and calculate the tape height as in Step 6. 10. Three separate test samples shall be used to determine conformance to the
14、specification requirements. 11. Record 1 h rebound height ( Step 6) and minimum height (Step 9). 12. Calculate the flow of the tape and record, using the following method: F = R 1 - H 1 F = Flow R 1 = 1 h rebound (Step 6) H 1 = Height after exposure (Step 9) Chemicals, materials, parts, and equipmen
15、t refer enced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities. FORD LABORATORY TEST METHOD BU 014-02 Page 4 of 4 Copyright 2000, Ford Global Technologies, Inc. FLOW CHARACTERISTICS OF WINDSHIELD AND BACKLITE BONDING TAPE Figure 1
