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Chemically Resistant adhesives

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Cosmic Plastics E4940S Mineral Filled Epoxy Molding Compound
Categories: Polymer; Thermoset; Epoxy; Epoxy, Encapsulating, Glass or Mineral Filled

Material Notes: Description: Cosmic E4940S is a mineral filled epoxy molding compound which is supplied in a granular form.

Features: It has excellent dimensional stability, improved thermal cycling and exceptional moisture resistance. Standard spiral flow range is 25-35” (EMMI) at 1500C and 1000 psi. It has a hot plate gel time of 22-30 seconds at 1600C, and 18-26 seconds at 1820C. It has a shelf life of eight months when stored at 50C.

Applications: It is designed for use in high-volume encapsulation of resistor networks and fiber-optic connectors requiring high quality, reliability and good moldability.

Information provided by Cosmic Plastics Inc

Vendors: No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
 
Physical PropertiesOriginal ValueComments
Specific Gravity 1.85 g/cc
Bulk Factor 2.0 - 5.0
Water Absorption 0.25 %
@Temperature 50.0 °C,
Time 173000 sec
Linear Mold Shrinkage 0.0020 - 0.0040 in/in
 
Mechanical PropertiesOriginal ValueComments
Hardness, Barcol 65
Tensile Strength at Break 12000 psi
Flexural Strength 15000 psi
Flexural Modulus 2.00e+6 psi
Compressive Strength 28000 psi
Izod Impact, Notched 0.500 ft-lb/in
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity 1.00e+15 ohm-cm
Surface Resistance 1.00e+15 ohm
Dielectric Constant 3.9
@Frequency 1000 Hz
Wet
 4.3
@Frequency 1e+6 Hz
Wet
Dielectric Strength 350 V/milWet, step by step
Dielectric Breakdown 56 VWet, step by step
Dissipation Factor 0.011
@Frequency 1e+6 Hz
Wet
 0.012
@Frequency 1000 Hz
Wet
Arc Resistance 180 sec
 
Thermal PropertiesOriginal ValueComments
CTE, linear 20.0 µm/m-°CAlpha 1
 70.0 µm/m-°CAlpha 2
Thermal Conductivity 0.00160 cal cm/sec-cm²-°C
Heat Distortion Temperature 260 °C
Glass Transition Temp, Tg 175 °C
Flammability, UL94 V-0
@Thickness 3.17 mm
 
Processing PropertiesOriginal ValueComments
Mold Temperature 150 - 180 °C
 
Descriptive Properties
Molding Pressure500-8000 psi

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PCOSM022 / 190804

Chemically Resistant adhesives

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