Innovative Electrically Conductive Adhesives: Nickel-Free and Cost-Effective
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A new product on the market is an electrically conductive adhesive developed by Polytec PT, which is formulated with a nickel-free filler and exhibits properties that are certainly comparable with those of standard silver conductive adhesives.
Electrically conductive adhesives have been widely used for a long time in the production of electronic components. The applications are as numerous and varied as the advantages of electrically conductive adhesives themselves, whether it is for SMD bonding or contacting RFID antennas. Special production processes in microelectronics, such as flip-chip assembly, were developed specifically for the use of electrically conductive adhesives, without which many complex circuits would not have been possible in the first place.
Usually, the electrically conductive adhesives used today are based on epoxy resins with a low ionic content and are filled with 70-80 % fine silver powder. This ensures very good electrical conductivity for epoxy resins, which otherwise have an insulating effect. Typically, such adhesives feature a volume resistivity of 10-3 to 10-4 Ω-cm. Polytec EC 275 is formulated without silver flakes and instead uses a nickel-free filler from European production. This alternative adhesive is not only substantially less expensive than standard silver adhesives, its raw material costs no longer directly depend on highly volatile precious metal market prices and dollar exchange rates, which, in addition to lower overall procurement costs, results in a more constant price and therefore to significantly better cost calculation security for the end user.
As far as its technical properties are concerned, Polytec EC 275 is largely comparable with conventional products with a silver filler.
Polytec EC 275 is suitable for such applications as IC packaging, hybrid and SMD bonding, contacting RFID antennas and EMI/RF shielding. The paste-like adhesive can be easily applied with various dispensing techniques, screen printing or manually. Like most two-component adhesives from Polytec PT, the new adhesive is also available premixed in frozen syringes.
For further information, please contact: Polytec PT GmbH, D-76337 Waldbronn, http://www.polytec-pt.de, firstname.lastname@example.org