What is the back of a picture frame made of?

Most picture framers use 3mm M.D.F. (Medium Density Fibreboard), thick cardboard, foam-board or thin plywood, behind mounted or unmounted artwork to give it a ‘spine’, or ‘back’. This is to add rigidity and also to ‘fill’ the gap between the art and the rear the frame.Click to see full answer. Also asked, what is the back of a picture frame called?Putting mats in a frame is called matting, a term which can also usually be used interchangeably with mat.Similarly, what does a picture frame symbolize? A picture frame does not symbolize anything. When a picture frame is put to use, it is simply a border that surrounds an artwork or narration. Picture frames that surround an artwork are intended to encapsulate the artwork in the manner most suitable, to exhibit or promote the vision of the artwork. Similarly, what are photo frames made of? Traditionally picture frames have been made of wood, and it remains very popular because wood frames can provide strength, be shaped in a broad range of profiles, and allow a variety surface treatments. Other materials include metals, e.g. silver, bronze, aluminum, and stiff plastics such as polystyrene.How do you open a picture frame back? Modern picture frames are easy to open. Remove the picture frame from the wall or box. Lay down the frame gently with its backside up. Find the locks that keep the frame’s back portion closed. Turn each lock about 90 degrees to unlock it. Hold the frame with one hand. Lift the back cover on its hinge.