1. Enrico Scarlini INFN and University of Florence CERN 25-Oct-2005
Protective cover of glue on the bonding pad site on the back of the cms module, HV contact.
Enrico Scarlini INFN and University of Florence
CERN 25-Oct-2005

2. EPOTEK 87GT Best glue Epotek 87GT , epoxy type ,
Cure at °C for 1 hour
Mix the 2 parts in equal quantity
Good electrical and mechanical characteristics, see the data sheet
Feature: Does not spread
The cost is medium not so high

3. ARALDITE RAPID Araldite rapid Ciba, epoxy 2 component like the other.
Hardens at room temperature in 1 hour
The spot of glue spreads during hardening
Low cost

4. Positioning of the glue spot
Manually with a sharp pointed tool under microscope (5 minutes for the operation).
Otherwise with an automatic dispenser gantry like but in this case we must use normal araldite (AW101), not rapid.

5. Negative issues
For 87GT a problem is the curing (minimum temperature: 50°c for 1 hour)
For all it is impossible to repair without damaging the detector.
The bonding jig must take into account this glue ball for up-face detector bonding

6. The two glues tried

7. Comparison between glues