As a customer you should have a base knowledge of the purpose of glazing.
It act as part of the package that may protect your treasures from insects, dust, humidity and light.
Basic glass protects a piece from insects, dust and some humidity if the framing package is done correctly. Basic (premium clear) does not have any UV protection nor does it have any inherent protection if it is broken accidentally. This is a glass chosen for non preservative framing or cost effective framing. This glass has a slight green tinge colour.
Anti glare glass has the same protection value as the basic glass but has an anti glare optical coating on both sides to keep the reflection value down to 9%. This glass or acrylic is good for non preservative framing. I.e. For children’s art unless they are the next “Van Gogh” or for decorator pieces. This is a glass used on most artists shows to keep the cost down plus the glare down so you may appreciate the art.
Conservation clear glass provides 99% UV protection that scatters the light to minimize the glare. It provides protection against bugs, dust, humidity plus it has layers that protect the piece if it is accidentally broken – shatter resistant (harder to break than premium or antiglare). This would be the choice for most individuals who are interested in preserving their piece for years to come. This glass makes a sealed frame enclosure.
Museum glass or acrylic provides the 99% UV protection but with low reflective but high clarity of light. This glass has an adhesive between the layers that make it shatter resistant and shard resistant. This glass is gas impermeable to make air tight frame enclosure. This is the highest quality of framing available.
The Company I use (tru-vue.com) also has acrylic products with similar specifications as to the glass. Acrylic does not have air tight framing quality as it is gas permeable. Acrylic is a good choice for larger pieces but it is important that you have space between the art work as it will flex inwards in a more humid environment and may harm your art. It is a good choice on larger pieces as it has half the weight of glass and is shatter proof.