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MikeMy daughter is a professional framer. Libraries use different glass, tends to be heavier, thicker and shatter proof. Or at least more difficult to break. As they are fearful of liabilty issues, surrounding broken glass, and all it's hellish possibilities. UV glass is very expensive, and breaks easily. Libraries for the most part, can not afford UV glass, and it's breaking problems. There is thicker UV glass that is more shatter proof, but it is ungodly expensive, and most libraries would never get that expenditure through committees and local councils, boards.