Perspex, also known as acrylic or Plexiglas, is a synthetic material possessing qualities of glass and plastic. Perspex often requires polishing to bring out the material's true clarity. Flame polishing the edges of the material helps light pass through, enhancing the appearance of the perspex, while providing a clean, finished edge.
Peel off any protective film on the perspex. This must be done first to prevent melting the film to the acrylic material during the polishing process.
Screw the nozzle to the opening of the propane torch. Unscrew the black knob on the top 3/4 of the way to begin gas flow.
Hold the torch, so that the nozzle is 1 inch from the cup of the spark generator. Squeeze the handles of the generator rapidly a few times to cause a spark, igniting the flame. Dial the black knob back to maintain a flame 4 to 5 inches long.
Quickly move the flame back and forth along the rough edges of the perspex. Note the shine that develops from the heat. Do not keep the flame in one position for any length of time to prevent melting.
Allow the perspex to cool. Do not lay the polished edge on the surface as it cools to prevent it sticking to the surface, or picking up contaminants.
Use caution around open flame. Do not wear long sleeves or flammable gloves during the polishing process.