1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2003 06 30 Revised Para 3.0 inserted; Para 3.1, 3.2, 3.3, 3.7, 3.8, 4 deleted 2000 09 26 Revised Updated A. Cockman 1998 04 23 B. Cardwell Printed copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 1 of 3 EPOXY RESIN,
2、POTTING COMPOUND WSS-M3L77-B2 1. SCOPE The material defined by this specification is an inorganic particle filled two-part liquid epoxy system consisting of a resin and a hardener. This system exhibits superior high temperature electrical properties and thermal shock resistance. 2. APPLICATION The m
3、aterial defined by this specification was originally used to encapsulate distributorless ignition system (DIS) coils. 3. REQUIREMENTS Material specification requirements are to be used for initial qualification of materials. 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and p
4、art producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.4 INDIVIDUAL COMPONENT PROPERTIES Resin Hardener 3.4.1 Chemical Type Epoxy Anhydride 3.4.2 Specific Gravity 1.87 - 1.97 1.15 - 1.18 (ISO 1675/ASTM D 1963) 3.4.3 Viscosity, cps (ASTM D 2393,
5、5 minute dwell) #1 at 20 RPM at 25 C N/A 50 - 80 #6 at 10 RPM at 60 C 20,000 - N/A 33,000 3.4.4 Shelf life at 25 +/- 12 12 5 C, months, min from date of manufacture Note: Hard packing of fillers in unopened containers during the shelf life period is a cause for rejection. ENGINEERING MATERIAL SPECIF
6、ICATIONWSS-M3L77-B2Printed copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 2 of 3 3.4.5 Wire Insulation Compatibility No visible damage to wire insulation Test Method: Immerse samples of the components or wires being potted in separate containers of resin and hardener for
7、 12 h at 100 C. 3.5 MIXED COMPONENT PROPERTIES 3.5.1 Component Ratio by Weight 100:27 (Epoxy: Hardener) 3.5.2 Gel Time, minutes 93 +/- 15 (ISO 9396 at 90 C/ASTM D 3056, 10 g at 90 C) 3.5.4 Viscosity, cps at 25 C 5,000 - 14,000 (ASTM D 2393, #4 at 10 RPM, 3 minutes dwell) 3.5.5 Filler Sedimentation,
8、max 16% Test Method: Mix resin and hardener and fill a 2 - 3 cm ID x 12 - 20 cm long glass test tube which has been liberally coated with a release agent. Let stand upright at 65 C for 1 h, then cure according to para 3.6.1. After cooling, remove or break away the glass. Cut two sections approximate
9、ly 1 cm thick, from top and bottom of the cylinder. Report the magnitude of the difference in ash content (ISO 7111/ASTM E 1131) between the two sections. 3.6 CURED RESIN PROPERTIES 3.6.1 Epoxy Resin Cure Schedule 1.25 h at 80 C + 2.50 h at 90 C + 1.25 h at 150 C. 3.6.2 Tensile Strength, min 57 MPa
10、(ISO 527/ASTM D 638M) 3.6.3 Elongation, min 0.7% (ISO 527/ASTM D 638M) 3.6.4 Flexural Strength, min 67 MPa (ISO 178/ASTM D 790M, Method I, Procedure A) 3.6.5 Ash Content 50 +/- 5% (ISO 7111/ASTM E 1131) 3.6.6 Water Absorption, 24 h, max 0.2% (ISO 62/ASTM D 570) 3.6.7 Coefficient of Linear Thermal 5.
11、5E-05 K-1 Expansion, max (ASTM D 696/DIN 53752) 3.6.8 Glass Transition Temperature, min 125 C (IEC 1006, Method A/ASTM D 3418) As Cured Wet (para 3.6.6) ENGINEERING MATERIAL SPECIFICATIONWSS-M3L77-B2Printed copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 3 of 3 3.6.9 Diel
12、ectric Constant, max (IEC 250/ASTM D 150, 10 kHz) At 30 C 4.5 4.6 At 90 C 4.6 4.7 At 150 C 5.0 5.0 3.6.10 Dissipation Factor, max (IEC 250/ASTM D 150, 10 kHz) At 30 C 1.4 1.6 At 90 C 1.7 2.6 At 150 C 4.1 4.8 3.6.11 Volume Resistivity, ohm-cm, min (IEC 93/ASTM D 257) At 30 C 2.5E14 2.4E14 At 90 C 1.3
13、E14 1.0E14 At 150 C 4.1E11 2.0E11 3.6.12 Dielectric Strength, 24.0 24.0 kV/mm, min (IEC 243-1/ASTM D 149, 2 mm) 3.6.13 Production Shop Trial (As specified by the responsible design and/or manufacturing activity) 3.6.14 Component/Module Life Cycle Testing (As specified by the responsible design activ
14、ity) 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 COLORANT The black colorant used in some versions of this material is a proprietary carbon black with reduced electrical conductivity. This colorant is added in low concentrations; however, localized concentrations of carbon black may affect performance of some electrical components.
