FORD FLTM BQ 104-2-2000 HUMIDITY RESISTANCE TESTING (Replaces FLTM BQ 004-02).pdf
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1、 FORD LABORATORY TEST METHOD BQ 104-02 Date Action Revisions 2000 11 10 Revised Editorial no technical change A. Cockman 1990 06 26 Printed copies are uncontrolled Page 1 of 3 Copyright 2000, Ford Global Technolog ies, Inc. HUMIDITY RESISTANCE TESTING Application This procedure is a method for prepa
2、ration of parts and cabinets for determining the resistance to humidity of various parts. Note: The procedure is not to be used for glazing materials. Apparatus Required Humidity Cabinet The humidity cabinet consists of a test chamber, a saturator tower, a supply of suitably conditioned compressed a
3、ir, specimen supports, provision for heating the chamber and suitable controls for maintaining the desired temperature. Top open ing, front opening, or walk - in type cabinets are satisfactory. Source: Harshaw Chemical Co., Equipment Section 15583 Brookpark Road Cleveland, Ohio 44142 or equivalent.
4、Size The cabinet shall be of sufficient size to test adequately the number of parts required by the Engineering Material Specification without overcrowding. Satisfactory correlation between test cabinets is obtained when the test chamber is no less than 0.7 m - approximately 0.6 x 0.9 x 1.2 m. Cabin
5、ets smaller than this may be difficu lt to control within the limits specified. Construction Materials Cabinet The test chamber shall be constructed of epoxy - lined steel or equivalent material. Specimen Racks Specimen racks and supports shall be constructed of plastic, vinyl coated steel, or equiv
6、alent materials. Shelves shall be provided with drain holes so that test specimens do not rest in pools of collected water. Plumbing All piping inside the test chamber shall be plastic or hard rubber. FORD LABORATORY TEST METHOD BQ 104 02 Page 2 of 3 Copyright 2000, Ford Global Technologies, Inc. Ve
7、nts Vents shall be so placed that moistu re is circulated freely about the test specimens and also exhausted to the outside of the cabinet. Saturator Tower The compressed air, after cleaning and before entering the cabinet, shall be passed in finely divided bubbles through a saturator of corrosi on
8、resistant materials, containing heated distilled or deionized water, controlled at the specified temperature. The distilled or deionized water in the saturator tower should be changed on a periodic basis, depending on water purity, to prevent excessive accumulation of impurities from the air. Temper
9、ature The temperature of the test chamber shall be maintained by heating elements in the walls of the cabinet through suitable controls. The test chamber shall be insulated by water jackets or other suitabl e means between the exterior walls of the cabinet to prevent cold spots where condensation on
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