Plastic-Graph Letters
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Plastic-Graph Letters
Page 120

Plastic Letters

PlastigraphThe Plastic-Graph letters system depends on the natural surface tension between the plastic letters and the board for its effectiveness. This phenomenon creates a natural adhesion between the very smooth thin plastic letters and the smooth surface of the board or even material like glass. This same surface tension allows some insects like "water striders" to float and slide on a water surface! This is a wonder of science! "Surface tension is the elastic tendency of a fluid surface which makes it acquire the least surface area possible." The thin plastic letters use the same kind of internal forces called "surface energy" to bond the thin plastic to the smooth surface. Letters come in different attractive colors, sizes, and typefaces and are available at a very reasonable cost from a large stationary supplier.

Surface Tension

Typefaces"Surface energy is the elastic tendency of a fluid surface which makes it acquire the least surface area possible." Plastic-Graph, which is the proprietary name for this material, uses this special property for highlighting keywords during a talk. The plastic letters are pre-formed as no artistic skills are required aside from placing them in the correct position on the board or shiny surface. In preparation, the lettering may be set up on pieces of clear film or tissue paper. Extra care needs to be exercised to ensure they are absolutely straight on the board.

Key Words

LetteringEach keyword used in a plastic-graph talk may be separated from the next with a sheet of tissue paper before placing on the display board. For further information see also Communicating Word Meanings.

"Plastic-Graph Letters"
by Ron Meacock © 1982-2019

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