Page 153 - GETELEC catalogue US 2020

GT 4120 Nickel filled epoxy conductive

glues

7
GT 4120 is a 100% solid two-component nickel filled conductive epoxy.
Designed for supplementary use, it is never intended to replace silver loaded epoxy, wich offers optimal conductivity
and performance.

This nickel epoxy is recommended for the repair of circuits or sheating applications, in which electrical conductivity
is not critical.
GT 4120 comes as an easy-handling smooth paste; it can be applied by screen printing, standard application system
or by syringe. It has good powers of adhesion on a range of substractes including most metals and plastics, ceramics
and glass.

GT 4120 epoxy resin in easy to mix (1 to 1 by weight) with a long usable life after mixing. It polymerises quickly at
relatively low temperatures.
This epoxy can be used for other applications where its non-reflective properties could be signifiant. And there is
no need to add any solvent to this 100% solid system. It does not dry out during its mixed usable life of 3-4 days.
It withstands intermittent temperatures of 300-400°C, with no detectable degradation below 430°C.

PROPERTIES GT 4120
Color Black
Consistency Slightly thixotropic smooth paste
Density g/cm3 3.5
Volume resistivity Ω-cm 0.35
Mixture viscosity at 25°C 30000 cps
Tg at 150°C for one hour 95°C
Hardness shore D 73
Tensile strength and tear resistance 147.7 kg/cm
Coefficient of thermal expansion (150°C for 1 hour)
Before Tg 89 x 10-6 mm/mm/°C
After Tg 139 x 10-6 mm/mm/°C
Continuous working temperature 150°C
Intermittent working temperature 300-400°C
Degradation temperature 430°C
Usable life after mixing (at 25°C) 3-4 days
Usable life before mixing (at 25°C) 1 year

POLYMERISATION

Temperature Minimum setting time
150°C 5 minutes
120°C 15 minutes
80°C 90 minutes

Mixing ratios Note
Part A (epoxy resin and nickel powder) 1 Mix parts A and B seperately, ensuring good
Part B (hardener and nickel powder) 1 mixing of the individual components, before
mixing them together.

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