Acrylic

Acrylic tends to be used because of its transparency and relatively easy working qualities, including shaping by heat forming; by hand, in a two part form, or by vacuum forming. Some downsides to its use are that it has a poor size to strength ratio compared to the other materials above, it is very reflective, and it can transmit light through from edge to edge.  Although transparent, acrylic plastic is not invisible to the viewer.  Nonetheless, being our only transparent mount material it’s often employed for that attribute.