Glass Pastes
The glass pastes include the encapsulation paste FK4027 and the FKM4000 marking paste system. The glass pastes were developed for AlN substrates.
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FK4027
The encapsulation paste FK4027 is applied as a
protective film onto thick-film resistors of the
fK9600 and FK9900M resistor paste series, and
onto its contacts. This prevents resistance drifts
which could result from environmental factors,
such as high air humidity or slight mechanical
abrasion. Where high film thicknesses are
required, the paste should be processed in
multiple separate screen printing and firing steps.
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FKM4000
The FKM4000 marking paste system is used to
apply marking, labels and logos onto AlN
substrates. However, the FKM4000 pastes should
not be printed over electric functional films, such
as conductors or resistors, as this could change
their properties.
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Technical specifications
| Characteristics | Unit | Encapsulation paste | Marking pastes | ||||
|---|---|---|---|---|---|---|---|
| FK4027 | FKM4128 | FKM4889 | FKM4891 | FKM4893 | FKM4939 | ||
| Color | -- | Green | Blue | Green | White | Black | Dark red |
| Viscosity | Pa·S | 20…50 | TBD | ||||
| Film surface | -- | Smooth, glazed | Smooth, dull | ||||
| Resistance change | % | <5 | -- | ||||
| Fired film thickness | µm | 12±2 | 12±2 | ||||
| Coverage | cm²/g | 120±5 | 120±5 | ||||
--from Fraunhofer IKTS
All other specifications correspond to the general process conditions.
