I The glue

The laboratory has bought five different glues and many tests have been made to allow making a choice. The results of these tests are shown in the third paragraph. Here are presented the properties of the glues.

I.1 The H20E

This glue is made by EPOXY TECHNOLOGY INC. It is a two component silver epoxy. The first part is epoxy resin and silver powder. Th second is hardener and silver powder. The silver decreases the volume resistivity but increases the price: 100 dollars for 1 pound. To use the glue, the 2 parts have to be mixed in a 1/1 ratio (by weight or by volume). The pot life is 4 days at room temperature. A mix is needed before each use. After the application of the glue, a heat cure is needed.

Cure schedule :

175 degrees C…………………………….45 seconds
150 degrees C…………………………….05 minutes
120 degrees C…………………………….15 minutes
80 degrees C……………………………..90 minutes
50 degrees C…………………………….12 hours

Here are some properties given by EPOXY TECHNOLOGY, INC :

Volume resistivity: < 0.0004 ohm-cm
Degradation temperature: 410 degrees C
Specific gravity: 2.6

I.2 The EG105 :

This glue is made by EPOXY TECHNOLOGY, INC. It’s a single component glue. It contains silver powder too. The EG105 needs an UV precure and a heat cure.

UV precure: 100 mW/cm square for 1-2 min at 480 nm

Cure schedule:

150 degrees C…………………5 minutes
130 degrees C…………………20 minutes
120 degrees C…………………60 minutes

The EG105 was cured at 120 degrees C during 60 minutes.

Here are some properties given by EPOXY TECHNOLOGY, INC :

Volume resistivity: 5.10^-5 ohm-cm
Degradation temperature: 380 degrees C
Specific gravity: 3.2 g/cc
Shore D hardness: 50

I.3 The E2101 :

This glue is made by EPOXY TECHNOLOGY, INC. It is a two components silver epoxy. The first part is the silver powder and the second is the hardener. The silver decreases the volume resistivity but increases the price: 100 dollar for 1 pound. To use the glue, the 2 parts have to be mix in a 3/1 ratio (by weight). The pot life is 3 days at room temperature. A mix is needed before each use. After the application of the glue, a heat cure is needed.

Cure schedule:

175 degrees C………………15 minutes
150 degrees C………………1 hour

The E2101 was cured at 175 degrees C during 15 minutes.

Here are some properties given by EPOXY TECHNOLOGY, INC :

Volume resistivity: 0.0001 to 0.0004 ohm-cm
Degradation temperature: 420 degrees C
Specific gravity: 3.1
Shore D hardness : 83

I.4 The 10HTN :

This glue is made by MASTER BOND INC. It’s a single component, heat curing, high purity Nickel conductive epoxy. After the application of the glue, a heat cure is needed.

Cure schedule :

120 degrees C…………………1 hour
135-150 degrees C…………….45 minutes

The minimum cure temperature is 110 degrees C. The 10HTN was cured at 120 degrees C during 1 hour.

Here are some properties given by MASTER BOND INC:

volume resistivity: 5 to 10 ohm-cm , 24 degrees C
Service temperature range: -73 degrees C to > 204 degrees C

I.5 The 10HTS :

This glue is made by MASTER BOND INC. It’s a single component, heat curing, high purity Silver conductive epoxy. After the application of the glue, a heat cure is needed.

Cure schedule :

120 degrees C…………………1 hour
135-150 degrees C…………….45 minutes

The minimum cure temperature is 110 degrees C. The 10HTS was cured at 120 degrees C during 1 hour.

Here are some properties given by MASTER BOND INC:

volume resistivity: <0.0002 ohm-cm , 24 degrees C
Service temperature range: -100 degrees F to > 400 degrees F