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Ceramic is a type of material deposited onto film substrate. There are many combinations of ceramics, a few have "spectral selective properties" (ie Titainium Nitride) which is different from being "spectrally select." The term spectrally select when used in the window film industry is referring to films that single out specific regions of the solar spectrum.
There are a number of window films that incorporate ceramic materials. Some are dye free/metal free, others contain dyes and pigments. Typically, you will see low reflectivity and low SHGC's on ceramics. The draw is the high performance and low reflectivity and most important the stability. Certain ceramics are incredibly stable compared to other metals, dyes, and alloys. Alloys can corrode, true ceramic materials are atomically stable and inert so they will not go through another chemical reaction which is what corrosion is.
Ceramic materials used in window films may be ultrafine “nano-particle dispersions” or other depositions of (for example) titanium nitride, antimony tin oxide,or indium tin oxide, to name a few. A ceramic can be electrically non-conductive, semi-conductive, super-conductive, or just plain “conductive.” Another term few people are familiar with is “cermet,” a term referring to composite
materials made from both ceramic and metallic ingredients, some of which are, in fact, used in window films.
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