32x40 Raw Sheet is uncut directly from the manufacturer and may not be exactly 32x40. It may be 1/16" undersize and up to 1/4" oversize, and not square.
This white, 1/16" thick papermat backing board is ideal for providing support for unframed artwork such as photos (matted in bag). It is buffered to acid free alkaline reserve of 3-5% and has a light cream colored bevel core. This papermat is a cost-effective backing or mounting board option for non-conservation applications, such as general decorative art.
If a primary backing for a framing is required we recommend foamcore backing instead of papermat backing board.