Cosmic Epoxy E4920FC

Chemical Family: Epoxy & Epoxy Derivatives

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.

Properties

Physical Form: Granules
Solid

Product families

Applications

Electrical & Electronics — Packaging & Assembly

Potting Compounds

Electrical & Electronics — Parts & Components

Other Parts & Components

Product Families

Plastics — Thermoset Resins

Epoxies

Other characteristics

Brand: Cosmic Epoxy
End Uses: Capacitors, Diodes, Encapsulant, Inductor, Rectifier
Polymer Name: Epoxy Resins & Compounds
Flexural Strength: 127.465 MPa
Volume Resistivity: 55,000,000,000,000.0 Ohm-m
Color: Black
Gold
Green
Red
Markets: Electrical & Electronics
Shelf LIfe: 6 months
Flame Rating: UL 94 V0
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.
Technology: Plastics
Fillers Included: Mineral
Material Features: Excellent Moisture Resistance
Fungus Resistant
Good Moldability
Good Thermal Stability
Low Odor
Applications: It is designed for encapsulation of passive devices such as capacitors, inductors, diodes and rectifiers
Handling Conditions: It has a shelf life of six months when stored at 5°C.
Certifications and Compliance: ISO 9001
UL 94
Plastics and Elastomers End Uses: Capacitors
Diodes
Encapsulant
Inductor
Rectifier
Plastics and Elastomers Functions: Resin

Technical data

Table 1 of 5

6 rows

Characteristic	Value	Unit
Flexural Strength	18500	psi
Flexural Modulus	2.0 x 10⁶	psi
Compressive Strength	35000	psi
Tensile Strength	12000	psi
Barcol Hardness	65	—
Impact Strength (Izod Notched)	0.5	ft-lb / inch

Table 2 of 5

5 rows

Characteristic	Value	Unit
Heat Deflection Temperature	260	°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 Conductivity	20 x 10⁻⁴	cal/sec/cm²/°C/cm

Table 3 of 5

9 rows

Characteristic	Value	Unit
Arc Resistance	180	seconds
Volume Resistance	5.5 x 10¹⁵	Ohm - cm
Surface Resistance	40 x 10¹⁵	Ohm - cm
Dielectric Strength (Kv Step-by-Step, Wet)	400	volts/mil
Dielectric Breakdown (Step-by-Step, Wet)	56	Kv
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	—

Table 4 of 5

1 row

Characteristic	Value	Unit
Water Absorption (at 50 °C,48 hours)	0.25	%

Table 5 of 5