Cosmic Plastics E4940P Mineral/Glass Filled Epoxy Molding Compound

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Cosmic Plastics E4940P Mineral/Glass Filled Epoxy Molding Compound
Categories:	Polymer; Thermoset; Epoxy; Epoxy, Encapsulating, Glass or Mineral Filled
Material Notes:	Description: Cosmic E4940P is a mineral filled, glass reinforced 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
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Physical Properties	Metric	English	Comments

Specific Gravity	1.85 g/cc	1.85 g/cc
Bulk Factor	2.0 - 5.0	2.0 - 5.0
Water Absorption	0.25 % @Temperature 50.0 °C, Time 173000 sec	0.25 % @Temperature 122 °F, Time 48.0 hour
Linear Mold Shrinkage	0.0020 - 0.0040 cm/cm	0.0020 - 0.0040 in/in

Mechanical Properties	Metric	English	Comments
Hardness, Barcol	65	65
Tensile Strength at Break	82.7 MPa	12000 psi
Flexural Strength	103 MPa	15000 psi
Flexural Modulus	13.8 GPa	2000 ksi
Compressive Strength	193 MPa	28000 psi
Izod Impact, Notched	0.267 J/cm	0.500 ft-lb/in

Electrical Properties	Metric	English	Comments
Volume Resistivity	1.00e+15 ohm-cm	1.00e+15 ohm-cm
Surface Resistance	1.00e+15 ohm	1.00e+15 ohm
Dielectric Constant	3.9 @Frequency 1000 Hz	3.9 @Frequency 1000 Hz	Wet
	4.3 @Frequency 1e+6 Hz	4.3 @Frequency 1e+6 Hz	Wet
Dielectric Strength	13.8 kV/mm	350 kV/in	Wet, step by step
Dielectric Breakdown	56 V	56 V	Wet, step by step
Dissipation Factor	0.011 @Frequency 1e+6 Hz	0.011 @Frequency 1e+6 Hz	Wet
	0.012 @Frequency 1000 Hz	0.012 @Frequency 1000 Hz	Wet
Arc Resistance	180 sec	180 sec

Thermal Properties	Metric	English	Comments
CTE, linear	25.0 µm/m-°C	13.9 µin/in-°F	Alpha 1
	70.0 µm/m-°C	38.9 µin/in-°F	Alpha 2
Thermal Conductivity	0.669 W/m-K	4.64 BTU-in/hr-ft²-°F
Heat Distortion Temperature	260 °C	500 °F
Glass Transition Temp, Tg	175 °C	347 °F

Processing Properties	Metric	English	Comments
Mold Temperature	150 - 180 °C	302 - 356 °F

Descriptive Properties
Molding Pressure	500-8000 psi

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PCOSM021 / 190803

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