A coating formed on hot glass through a high-temperature deposition process, often during float-glass manufacture.
GlassRenu · Educational illustration
Meaning and boundaries
Often called a hard coat, but that informal label does not mean the coating is scratch-proof or universally safe to polish.
Why it matters in glass restoration
Its durability and possible exposed-surface use differ from many vacuum-deposited coatings, yet manufacturer-specific restrictions still control treatment.