High Density Overlay (HDO)
173P Highway Sign HDO


Paneltech’s Highway Sign HDO is a specialty overlay composed of a bleached kraft paper saturated with high levels of phenolic thermoset resin. Its high resin content gives a smooth, glossy  surface ideally suited to use as highway signs. The overlay is formulated for excellent surface adhesion. HDO 173P bonds well to an MDO cushion sheet as well as commonly used wood substrates. 173P exceeds the requirements of the PS1-19 Voluntary Product Standard.


  • Hard, abrasion resistant surface
  • Smooth surface with excellent adhesion properties
  • Improves weatherability over untreated panels
  • Quality controlled continuously by online weight and volatile sensors, calibrated hourly
  • Each sheet visually inspected
  • Caul release system formulated for paintability and no buildup