This is the glass or acrylic (such as Plexiglas) that protects the art. How to choose between the two?
Glass is cheaper and more scratch resistant.
Acrylic is lighter and more break resistant.
Westfall Framing only sells acrylic, but if you prefer, glass is easy to acquire locally. Single Strength is usually sufficient. When you order glass, specify that you need the size cut exact.
Westfall Framing sells two kinds of Acrylic:
Regular is considered standard and is suitable in most instances.
Ultraviolet Filtering is suitable when framing extremely valuable pieces, or when exposure to direct sunlight is possible.
Generally speaking, everything needs glazing except paintings on canvas.
Order your glazing at the same dimensions as your frame.