This is the most basic and affordable type of glass. It will protect the art from human contact but is not made to protect artwork against ultraviolet light or reduce reflective glare.
Also known as ultraviolet clear, this glass is the most effective for blocking ultraviolet rays. Ultraviolet rays can do harm to any piece of art, which makes conservation clear recommended for almost any matting job. This is especially the case if the work will hang in a place that receives a great amount of direct sunlight.
Also known as non-glare, this glass reduces the reflection of light. Often times the process that is used to reduce glare also decreases the resolution through the glass. However, many modern reflection control glasses have greatly reduced this effect.
Also known as ultraviolet non-glare glass, this glass both protects against ultraviolet light and reduces the glare on the work of art. Even when using this glass, however, it is still not advisable to hang artwork in direct sunlight, because damage can occur even through protective glass.
This is the highest quality picture framing glass in the industry. It has both ultraviolet protection and glare reducing properties at the highest standards. Museum glass is recommended for any piece of art with either high sentimental or monetary value such as antiques, heirlooms or original works of art.
Also known as "plexiglass," acrylic is actually not a glass; it's a plastic. Acrylic is available in glare reduction and ultraviolet protection forms. It is most commonly used in situations where breakage is an issue, such as shipping, children's rooms and large scale artwork.