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	Original Value	Comments

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 Properties	Original Value	Comments
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 Properties	Original Value	Comments
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/mil	Wet, step by step
Dielectric Breakdown	56 V	Wet, step by step
Dissipation Factor	0.011 @Frequency 1e+6 Hz	Wet
	0.012 @Frequency 1000 Hz	Wet
Arc Resistance	180 sec

Thermal Properties	Original Value	Comments
CTE, linear	25.0 µm/m-°C	Alpha 1
	70.0 µm/m-°C	Alpha 2
Thermal Conductivity	0.00160 cal cm/sec-cm²-°C
Heat Distortion Temperature	260 °C
Glass Transition Temp, Tg	175 °C

Processing Properties	Original Value	Comments
Mold Temperature	150 - 180 °C

Descriptive Properties
Molding Pressure	500-8000 psi

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PCOSM021 / 190803

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