Technical Data

Test	Method
Crosshatch Adhesion	ASTM D3359
Coating Adhesion	ASTM D 3359/Internal
Surface Resistivity	4-point probe
Temperature/Humidity	Internal

Attribute	Benefit
PVD process	Coatings do not peel, chip or flake Entirely green (no toxic by-products) Compliant with RoHS
Multi-material and multi-layer coatings	Unique functional properties High E-Field EMI shielding
Nickel and stainless steel materials	H-Field (magnetic) shielding Corrosion resistance

Certain vacuum metalized coatings, such as aluminum, nickel, and stainless steel are very stable in both cold and hot/wet environments. For example, as shown at right for a very thin layer (e.g., 0.5 µm) of pure aluminum, the surface resistivity is nearly unchanged after enduring a long cycle of cold (-40ºF) followed by hot/wet (85ºF/85%) testing.

Aluminum samples (0.5 µm) also demonstrate excellent shielding effectiveness over a wide range of frequencies with virtually no diminution of shielding effectiveness after cycling through cold and hot/wet environments.

In general, vacuum metalized coatings provide highly effective thin functional films for EMI shielding purposes. Multi-layer, multi-material coating systems can provide additional protection from the environment.

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