Cookson Group Plaskon® 440S Mineral Filled Novolac Epoxy Molding Compound

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Cookson Group Plaskon® 440S Mineral Filled Novolac Epoxy Molding Compound (discontinued **)
Categories:	Polymer; Thermoset; Epoxy; Epoxy, Molded, Mineral Filled; Filled/Reinforced Thermoset
Material Notes:	Test specimens were transfer molded and post cured 4 hours at 175°C. Combines exceptional reliability with wide process latitude. This material is designed to encapsulate a wide range of semiconductor devices including diodes, transistors, and integrated circuits in dual in-line, quad or small outline configurations.
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Physical Properties	Metric	English	Comments

Density	1.80 g/cc	0.0650 lb/in³
Spiral Flow	64.0 - 88.0 cm	25.2 - 34.6 in	177°C/1000 psi

Mechanical Properties	Metric	English	Comments
Hardness, Shore D	80	80
Tensile Strength, Ultimate	97.0 MPa	14100 psi
Flexural Strength	147 MPa	21300 psi

Electrical Properties	Metric	English	Comments
Dielectric Constant	3.9 @Frequency 1000 Hz	3.9 @Frequency 1000 Hz
Dielectric Strength	20.0 kV/mm	508 kV/in
Dissipation Factor	0.0060 @Frequency 1000 Hz	0.0060 @Frequency 1000 Hz
Arc Resistance	190 sec	190 sec

Thermal Properties	Metric	English	Comments
CTE, linear	22.0 µm/m-°C @Temperature 20.0 °C	12.2 µin/in-°F @Temperature 68.0 °F
CTE, linear, Transverse to Flow	78.0 µm/m-°C @Temperature 20.0 °C	43.3 µin/in-°F @Temperature 68.0 °F
Thermal Conductivity	0.600 W/m-K	4.16 BTU-in/hr-ft²-°F
Glass Transition Temp, Tg	155 °C	311 °F
Flammability, UL94	V-0 @Thickness 3.20 mm	V-0 @Thickness 0.126 in
	V-0 @Thickness 3.20 mm	V-0 @Thickness 0.126 in

Processing Properties	Metric	English	Comments
Processing Temperature	175 - 185 °C	347 - 365 °F	Molding temperature

**
Materials flagged as discontinued () are no longer part of the manufacturer’s standard product line according to our latest information. These materials may be available by special order, in distribution inventory, or reinstated as an active product. Data sheets from materials that are no longer available remain in MatWeb to assist users in finding replacement materials.

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PCOOK302 / 21398

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