Electrically conductive FIP (form-in-place) gaskets from Chromerics now include materials for consumer, industrial, and military/aerospace applications. The FIP materials can reduce the installation cost of an EMI gasket by up to 60%, claims the company. The corrosion-resistant materials protect against galvanic activity and may, in many applications, eliminate the need for Ni or Sn plating and/or secondary environmental gaskets. The ChoForm 1122V uses a silver/aluminium conductive filler to provide a shielding effectiveness of greater than 65dB (average over 200MHz to 12GHz), and a maximum operating temperature of +130ºC. It has high corrosion resistance and a shore A hardness of 50, making it suitable for low-closure-force applications. Low-hardness ChoForm 5550 uses a nickel/graphite filler to help it achieve a shielding effectiveness of 65dB. This 43 Shore A material can be dispensed in a triangular-shaped bead with a high aspect ratio—a maximum height of 3mm—for where closure forces are extremely low or where there is a degree of unevenness between mating surfaces. Maximum operating temperature is +125ºC. ChoForm 5545 incorporates a tungsten carbide filler and possesses high corrosion resistance for use in harsh environments. Shielding effectiveness is greater than 65dB, and the material can be used at up to +125ºC.
