Sometimes fragile items such as newspaper articles and old documents need to be supported on the conservation board. This encapsulation method, often used by museums, works by placing the item between two sheets of polyester film held together with double sided tape, with a small air space so the work can breathe.
Letters and certificates are hinged on conservation board however when both sides are required to be shown the encapsulation method is used, the framing is sandwiched between two or more mounts and two sheets of glass, and then framed.
Heavy items require a different method of support called a sink mount. A Magazine/Book or Artwork rests within a supporting cradle of foamboard to the required depth of the object, and a mount is fixed on top of the package, which in turn is glazed and framed.