SiO2 (silicon dioxide)

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PVD-02: <a href="/wiki/index.php?title=Lesker_PVD75_E-Beam/Thermal_Evaporator" title="Lesker PVD75 E-Beam/Thermal Evaporator"> Lesker PVD75 E-Beam/Thermal Evaporator
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PVD-05: <a href="/wiki/index.php?title=Denton_Explorer14_Magnetron_Sputterer" title="Denton Explorer14 Magnetron Sputterer"> Denton Explorer14 Magnetron Sputterer

Silicon dioxide is an insulating, transparent oxide that is highly unreactive. It is often used as a passivation layer to protect electrical components.