This thin film coating is based on tin oxide and silver oxide. It is applied to the fourth surface of an IG unit and so is exposed to the inside of the building. It is a second low e coating and is used many times in the north to increase the amount of heat from the sun that is captured during the day. It is difficult to locate since it isn't that visible. But since we are always in direct contact with it when we are cleaning the most important thing to know is we should NEVER use a razor blade on it. Also if there is paint on it we need to know what products to use that will not do any harm. I am in the process of developing these products. One of which is a superabrasive plastic powder that can be blended with organic solvent like the essential oils or others. One of which is in my car right now waiting for testing. If you would like to learn more about S4 coated IG Units please check out this article from Mathews Brothers Windows.
https://mathewsbrothers.com/wp-content/uploads/2021/01/2016_2_S4-alt-layout.pdf
Also check out this video I made on locating S4 coatings. I call it Squeek or no Squeek.
The most important thing to remember is to Know where these coatings are. Which should be done at the time of construction when the home or building is constructed. If you do find them they need to be protected by removable plastic film. This will guard against most anything except a hammer.
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