Add accents to your framing needs with our matboard pH level is 5.0 for our standard premium and black core mat boards. If you are interested in a mat board that is archival and conservation quality, check out our acid free frame mats which have a pH level of 7.0. Fillet molding some of the most beautiful framed objects have a stunning finish touch with a picture frame molding. These picture frame moldings are aimed to complement the main picture frame molding as well as the framed object.