Delomonopox GE7985 Electronics Adhesive
Delicate yet Durable
With Delomonopox GE7985, Delo Industrie Klebstoffe GmbH & Co. KGaA, Windach, Germany, has introduced an electronics adhesive that can be applied as a very thin wall, while retaining excellent dispensing characteristics. It is ideal for components used in automotive and industrial applications requiring high mechanical performance in combination with miniaturized designs. The adhesive has smaller fillers than its predecessors and can be applied using needles with a diameter as small as 250 µm. Furthermore, because of its high viscosity of 160,000 mPas, the adhesive provides great stability, states the manufacturer. It allows an aspect ratio of 2.5, which means that the height of an adhesive bead can be more than twice its width, without the bead collapsing.
The easy-to-handle adhesive makes it possible to create delicate structures – such as high separating wall between two sensors – that required little width. This "dam stacking" of beads is possible without intermediate curing. According to the manufacturer, the adhesive features an extended service temperature range of up to 200 °C, low water absorption and very good chemical resistance to acids, oils and other aggressive media. Moreover, the black, one-component products has a coefficient of thermal expansion of 24 ppm/K. Combined with the glass transition temperature of 180 °C, this minimizes warpage over a wide temperature range.
On the flame-retardant circuit board material FR4, Delomonopox GE7985 achieves a compression shear strength of 49 MPa. Even after storage for 500 h at 200 °C, this value hardly changes and is still 43 MPa, according to the press release from the manufacturer. The adhesive cures under heat, with flexible control capability, e. g., 20 min at 150 °C or 90 min at 125 °C. Thanks to its flow resistance, there is no change in aspect ratio. The height of the adhesive bead does not change after curing either.
DELO Industrie Klebstoffe GmbH & Co. KGaA
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