HDU letters are a lightweight yet remarkably strong product. HDU stands for High Density Urethane and is a strong, naturally waterproof sign material made for creating dimensional signs.  This material is unaffected by weather and is very durable, specifically engineered to make signs. As your wholesale manufacturer we offer HDU sign foam in 10lb or 15lb density. Furthermore we offer different thicknesses, varying between 1/2″ and 3″ thick. Since these sign foam letters are specifically engineered to make signs, they can be used indoors as well as outdoors. 

At Elite Letters & Logos we can recommend the right type of installation method, depending on indoor/outdoor usage, thickness and the surface where the letters will be installed. HDU dimensional letters can be installed using double stick tape, adhesive, or stud mount. Please be informed that we also offer routed signs made from HDU, about which you can find more information here.