Volume resistivities silver-filled epoxies

Table 2.3 Volume resistivity versus cure conditions for a silver-filled epoxy adhesive ...

Figure 2.12 Volume resistivity versus temperature for silver-filled epoxy paste adhesive.

Table 2.4 Volume resistivities for silver-filled epoxy adhesives (ohm-cm)...

For electrically conductive metal-filled adhesives, dielectric constants and dissipation factors are not meaningful parameters, but volume resistivities and contact resistances are significant. The volume resistivities for the best silver-filled epoxies range from 1 x 10 to 8 x 10 " ohm-cm. 

Silver-filled epoxies and other electrically conductive adhesives are widely used to electrically connect chip devices or packaged components to interconnect substrates or printed-circuit boards. Chip capacitors, resistors, transistors, diodes, and magnetic components may be attached with silver-filled epoxies whose volume resistivities range from 1 x 10 " to 3 x 10 " ohm-cm or with gold-filled epoxies whose volume resistivities are approximately 8 x 10 ohm-cm. Conductive adhesives are also finding use as replacements for solder balls in flip-chip devices. In all cases, to achieve reliable connections, initially low-contact resistances or volume resistivities must remain low on aging and on exposure to operational stress conditions, such as humidity, temperature, vibration, shock, and power. 

Table 2.3. Volume Resistivity vs Cure Conditions for a Silver-filled Epoxy Adhesive ...

Volume resistivity S5.0 X 10 ohm-m (silver-filled), SI.5 X 10 ohm-m (gold-filled) 3.5.8 Strip of epoxy cured onto a glass slide 3.8.11... 

Some applications call for an electrically conductive adhesive. Masterbond offers EP21TDC/S Medical which is a two-component, electrically conductive, silver-filled tough epoxy adhesive with a high peel strength as well as low volume resistivity. 

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