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SPI Supplies® Properties of Cured Silver Films




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We are often asked about the physical and mechanical properties of cured "silver" films made from SPI Conductive Silver Paint and SPI Silver Paste Plus. It is sometimes assumed that these properties are similar to those of metallic silver, and they are not, because the cured film is really a composite material consisting of flakes of silver colloid in a polymer matrix. The properties of the most interest are density and resistivity, and both of these are highly dependent on application technique. All of the properties given here are "typical", but we offer no guarantee that you will obtain similar results in your application. You will have to do your own testing to be sure.

Typical Properties
Sheet Resistivity (25 um [0.001"] film thickness):
Specification:
<100 milli Ω/square
Typical:
12 milli Ω/square

Adhesion Strength:
Tensile:
        Specification:
>700 N/cm2 (1000 lb/in2)
        Typical:
1000 N/cm2 (1500 lb/in2)
Lap Shear:
~1400 N/cm2 (2000 lb/in2)

Bulk Resistivity: 3 x 10-5 Ω-cm
Specific Heat:0.30 J/g°C (0.07 cal/g°C)
Thermal Conductivity:0.04J/cm-s°C (0.01 cal/cm-s°C)
Coefficient of Expansion:3 x 10-5 m/m/°C
Modulus of Elasticity (tensile):4 x 10+10 Pa (6x106 lb/in2)
Poisson's Ratio:0.35


These properties are not those of SPI Silver Paste Plus cured according to the recommended curing cycle. SPI Silver Paste Plus can achieve properties similar to those of metallic silver when cured according to these recommendations.

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Sunday March 21, 2010
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