1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2005 02 16 Revised Inserted 3.0; Deleted 3.1, 3.8, 4 1988 09 15 Released 107002-185 CF4S Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 1 of 4 EPOXY POWDER, ELECTRICAL INSULATION ESF-M3L86-A SPRAY OR FLUIDIZ
2、ED BED APPLICATION 1. SCOPE The material defined by this specification is a finely ground epichlorohydrin bisphenol epoxy resin in dry powder form. It is applied to the surface of a part from a fluidized bed. 2. APPLICATION This specification was released originally for material used as a coating on
3、 metal for electrical insulation and corrosion protection, such as on the fuel pump motor armature for slot and end insulation. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production M
4、aterials (WSS-M99P1111-A). 3.2 PREPARATION OF TEST BARS Six square steel bars (12.7 x 12.7 x 150 mm) having all significant surfaces ground to 0.75 - 1.25 micrometers rms shall be thoroughly degreased in at least two successive baths of trichloroethane. They shall then be coated per suppliers recomm
5、endations with 0.30 - 0.46 mm of resin on the flat surface. The bars shall then be cured for 5 min at 230 +/- 2 C in an air circulating oven. This time and temperature may be deviated provided the actual time and temperature data accompany the bars at the time of submission. Test bars which do not m
6、eet the above requirements for thickness and coverage may not be reworked for submission to this specification. 3.3 DIFFERENTIAL SCANNING CALORIMETRY The DSC thermogram for this material shall match the standard thermogram curve on file at the appropriate Materials office of the affected Product Eng
7、ineering office. The thermogram shall be generated at 20 C/min in air at 1 atmosphere (101 kPa) and shall show the Tg and the heat of reaction. ENGINEERING MATERIAL SPECIFICATIONESF-M3L86-APrinted copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 2 of 4 3.4 CUT THROUGH TEMPE
8、RATURE, min 300 C (Average of 2 tests) All bars must pass Test Method: See Figure 1. Mount the bar by means of clamps on a ring stand. Place a loop of 26 gage bare copper wire over the resin coated area 13 mm from the coated end. Attach a 227 g weight including any clamps or leads to the wire and pl
9、ace the test assembly in a forced air circulating type oven. Attach one lead from an 8Va-c power supply alarm circuit to the cutting wire and one to the bare end of the steel test bar. Include this lead weight as part of the 227 g load. Attach a thermocouple to the steel bar by placing in the 3.2 mm
10、 drilled hole in the bar. Secure with bolt. Start the oven and increase the temperature at a rate not to exceed 208 C/h to allow uniform heating of the test bar. When cutting wire penetrates the resin and contacts the steel bar surface the circuit will be closed and the buzzer alarm activated. Immed
11、iately record the temperature of the test bar. This temperature shall be defined as the cut through temperature of resin. Repeat the test and record the average of the 2 tests as the cut through temperature. 3.5 DIELECTRIC STRENGTH, min 30 kV/mm (ASTM D 149, short time, test 6 bars) Except use the b
12、ar as one electrode and a 12.7 mm wide aluminum foil wrapped completely around the bar on the resin as the second electrode. All bars must meet or exceed the minimum. 3.6 EDGE COVERAGE, min 30% Mask ends of 2 bars for approximately 13 mm. Coat to 0.36 +/- 0.05 mm thickness. Cure resin. Measure edge
13、coverage as follows: (See Figure II) a. Determine bar dimensions 1-3 and 2-4 at point A. b. Determine resin coated bar dimensions 1-3 and 2-4 at point B approximately 13 mm from the edges. c. Subtract readings in step one from corresponding readings in step 2 to determine resin thickness on flat sur
14、faces at point B. Average the resin thickness values. d. Determine bar dimensions across corners, dimensions 5 and 6 at point A. e. Determine bar dimensions across corners, dimensions 5 and 6 at point B approximately 13 mm from the coated edge. f. Subtract readings to step 4 from corresponding readi
15、ngs in step 5 to determine reading thickness on corners at point B. Average the resin thickness values. g. Divide the average corner resin thickness (step 4v result) by the average flat surface resin thickness (step 3 result) and multiply by 100 to calculate percent edge coverage. Average the four r
16、esults determined from two test bars to determine conformance to the specification. 3.7 Powders of different manufacture, process, blend or chemistry shall not be intermixed in the electrostatic fluidized bed without prior approval of the Product Engineering Office. ENGINEERING MATERIAL SPECIFICATIO
17、NESF-M3L86-APrinted copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 3 of 4 5. GENERAL INFORMATION The information below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 TOXICITY This material shall be considered as relativ
18、ely nontoxic compared to liquid epoxies. However, since it is an epoxy, care should be taken to avoid prolonged exposure to the skin. This material should be used in a closed system to reduce the possibility of breathing the powder. 5.2 EXPLOSION HAZARD As stated, the material should be used in a cl
19、osed system because of the possibility of dust explosion present in powdered materials. 5.3 STORAGE LIFE The resin shall be used on a first in, first out basis. All containers shall be sealed and prominently show the date of manufacture; the batch number; the 6 month expiration date. No material may
20、 be used beyond its expiration date or from damaged containers without the approval of the Product Engineering Office. Caution must be employed to insure that this material is not exposed to unnecessary heat or other sources of energy which will affect storage life. Maximum allowable storage temperature is 38 C. From May 15 to September 30 all material must be shipped via refrigerated vehicles. ENGINEERING MATERIAL SPECIFICATIONESF-M3L86-APrinted copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 4 of 4
