HDO Plywood Sign Material

HDO (High Density Overlay) Plywood is available in a thickness of 3/4". This material is used for making reflective and non reflective vinyl signs or as a backing for a vinyl overlay. The back and edges of your sign can be painted black, brown or a buff color. HDO Plywood has a lifespan of 7-10 years.


HDO is most commonly used for making U.S. Forest Service Road and Highway Signs.

Features & Benefits

5/8" Thick

7-10 Year Average Life

Black Back

Painted Edges

Sheeted with High Intensity Prismatic

Splinter Free

Ideal for any climate

*if your signs will be in an area with a lot of snow or moisture, we recommend to order your signs with clear coat and edged tape for extra protection*

Material Sheeting

Routed Signs

HDO Sheeting/Overlay Options

HDO signs may be sheeted with one of the following reflective products: 
3M 3290 Engineer Grade (Less Reflective) 
3M 3930 High Intensity Prismatic (More Reflective) 
3M 4090 Diamond Grade (Most Reflective)

Unless noted all signs will be manufactured with HIP sheeting (High Intensity Prismatic) with 3M 1170 ElectroCut Film applied over the top. Upon request 3M 1170 Clear Film will be applied for a Clear Coat Overlay.

High Intensity Prismatic Grade (HI)

3M High Intensity Prismatic Series 3930. Meets ASTM D4956 type III and Type IV Specifications. This material reflects 5x more light then the standard EG Grade.