The core backing and surface paper are acid free.
Acid free mat board difference.
What does acid free actually mean.
The mat board companies obliged coming up with a new product for the ultimate in protection the aptly named museum board.
If you do want to provide additional barrier between the print and the foam you will want to use 100 cotton rag mat board which is naturally inert.
Backing boards come in any size.
Rag mat boards come in 2 thickness 2 ply and 4 ply.
Moreover they wanted the lignin free acid free matboard neutralized to protect against free floating acid in the air.
Mat board center pack of 10 11x14 for 8x10 white mats clear bags backing boards acid free 4 ply thickness white core for pictures photos framing 4 8 out of 5 stars 22 19 99 19.
If your mat board is of an economy grade we recommend the white rpb boards or for something thicker the standard or acid free foam core offers more support for larger artwork.
Rag mat board is made from cotton.
4 ply is roughly the same thickness as regular mat board.
Jodie we have two levels of foamboard acid free and artcare acid free that provides a little more protection.
Backing is used to provide support and protection for your artwork either in a picture frame or as a standalone product in a show kit we offer economy pressboard standard matboard backing archival quality backing foam board regular and acid free as well self adhesive archival.
What you need depends on how archival you want to get.