company tower banner
Cosmic Plastics Company Logo

Cosmic Epoxy E4920FC

1 of 25 products in this brand
Cosmic Epoxy E4920FC is a mineral-filled epoxy molding compound available either in granular form or preformed in a variety of sizes and weights. It offers excellent moisture resistance, thermal cycling stability, and outstanding moldability. Parts molded from this material also resist fungus growth and are designed for the encapsulation of passive devices such as capacitors, inductors, diodes, and rectifiers.

Polymer Name: Epoxy Resins & Compounds

End Uses: Capacitors, Diodes, Encapsulant, Inductor, Rectifier

Volume Resistivity: 55000000000000.0 - 55000000000000.0 Ohm-m

Flexural Strength: 127.465 - 127.465 MPa

Knowde Enhanced TDS

Identification & Functionality

Fillers Included
Plastics & Elastomers Functions
Technologies

Features & Benefits

Key Features
  • It has excellent moisture resistance, thermal cycling stability and outstanding moldability.
  • Parts molded from this material do not support fungus growth.
  • It is available in a wide flow range to suit custom molding requirements. E4920FC can be supplied in black, gold, green or red.

Applications & Uses

Product Applications

It is designed for encapsulation of passive devices such as capacitors, inductors, diodes and rectifiers

Properties

Flame Rating
Physical Form
Flame Rating
UL 94 V0
Mechanical Properties
ValueUnitsTest Method / Conditions
Flexural Strength18500psi
Flexural Modulus2.0 x 10⁶psi
Compressive Strength35000psi
Tensile Strength12000psi
Barcol Hardness65
Impact Strength (Izod Notched)0.5ft-lb / inch
Thermal Properties
ValueUnitsTest Method / Conditions
Heat Deflection Temperature260°C
Glass Transition Temperature (Tg)175°C
Coefficient of Linear Expansion (Alpha 1)19 x 10⁻⁶°C
Coefficient of Linear Expansion (Alpha 2)70 x 10⁻⁶°C
Thermal Conductivity20 x 10⁻⁴cal/sec/cm²/°C/cm
Electrical Properties
ValueUnitsTest Method / Conditions
Arc Resistance180seconds
Volume Resistance5.5 x 10¹⁵Ohm - cm
Surface Resistance40 x 10¹⁵Ohm - cm
Dielectric Strength (Kv Step-by-Step, Wet)400volts/mil
Dielectric Breakdown (Step-by-Step, Wet)56Kv
Dielectric Constant (at 1 KHz, Wet)3.9
Dissipation Factor (at 1KHz, Wet)0.012
Dielectric Constant (at 1 MHz, Wet)4.3
Dissipation Factor (at 1MHz, Wet)0.011
Moisture Properties
ValueUnitsTest Method / Conditions
Water Absorption (at 50 °C,48 hours)0.25%
Processing Information (Molding)
ValueUnitsTest Method / Conditions
Specific Gravity1.85
Bulk Factor2 - 5
Molding Pressure300 - 1,000psi
Molding Temperature150 - 180°C
Mold Shrinkage0.002 - 0.004In / In

Regulatory & Compliance

Certifications & Compliance

Storage & Handling

Shelf Life
6 months
Shelf Life Conditions

It has a shelf life of six months when stored at 5°C.