This paper was developed so the advantages of MicroChamber technology could be made available in standard archival folders. It has all the archival properties of our standard Lig-Free paper, with the added benefits that come from the MicroChamber technology. This paper is attractive, with an excellent hand, and of course provides the maximum protection possible for materials housed within it. With considerable capacity to remove acetic acid, this is also an excellent choice for use as a protective liner for wooden shelves and drawers. The usual grain direction is 36 in the 36 x 48, 60 in the 42 x 60, and 72 in the 48 x 72 sheets. See the Technical Information section of this site for detailed information about our archival papers and boards. All versions of our MicroChamber papers pass the PAT.