1、FORD LABORATORY TEST METHOD BP 108-08 2001 0823 ELECTROCHEMICAL RESISTANCE OF FUEL LINES Revised Editorial - no technical change A. Cockman Application This test method determines the electrochemical resistance of PTFE (polytetra-fluoroethylene) fuel lines. Materials and Apparatus Required Electrode
2、 Adapter - #MS21900 Source: Teleflex, Inc. 11 79 Maplelawn Troy, MI 48084 U.S.A. Power Supply Capable of maintaining 1 O00 Volts DC and a sensitivity of 1 microampere. Solvent - per ASTM D 235. Isopropyl Alcohol Sodium Chloride Solution Mix 450 g NaCI in 1 liter of distilled water. Conditioning and
3、Test Conditions All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 OC 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 hose test spec
4、imen with braid and fitting at one end as shown in Figure 1. 2. Clean the inner surface of the test specimen first with solvent per ASTM D 235, then with isopropyl alcohol to remove any surface contamination. Thoroughly dry at 23 +/- 2 “C. I I Date I Action I Revisions Copyright O 2001, Ford Global
5、Technologies, Inc FORD LABORATORY TEST METHOD BP 108-08 3. 4. 5. 6. 7. 8. Ensure that the wire braid flares out to prevent contact with the end of the PTFE tube. Assemble the electrode adapter #MS21900 to the fitting end of the hose. Assemble a salt or mercury electrode in the upper end of the tube
6、test specimen. Immerse the lower half of the assembly in the specified salt solution in a vertical position. Apply a potential of 1 O00 volts between the upper and lower electrode. Measure the current with an instrument having a sensitivity of 1 x 1 O-6 amperes. Chemicals, materials, parts, and equi
7、pment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities. Page 2 of 3 Copyright O 2001, Ford Global Technologies, Inc FORD LABORATORY TEST METHOD BP 108-08 ELECTROCHEMICAL RESISTANCE OF FUEL LINES I 7 ih+f& M PM-M ETAL L I C PLUG -“O“-RING SEAL TETRAFLUORO ETHY LENE ,I 330 . HOSEBRAID DIMENSIONS IN MM FITTING SOCKET TING TING NIPPLE i NUT RODE TUBE MS21900 ADAPTER (INSU LAT E ELECT RO D E FROM GROUND) Figure 1 Conductivity Test Diagram Copyright O 2001, Ford Global Technologies, Inc Page 3 of 3
