HDU Precision Board® - High-Density Urethane Sign & Tooling Board

High Density Urethane (HDU) Precision Board is the preferred choice for signage and tooling because it eliminates the natural failures of wood. Unlike wood, HDU is engineered to be completely waterproof, rot-resistant, and chemically inert. It is an ideal choice for professionals who require a dimensionally stable substrate that won't warp, crack, or peel, regardless of environmental exposure.

• Cost-efficient - requires significantly less primer/sealer than wood
• Closed cell structure - weatherproof & waterproof
• Won't rot, crack, or peel
• Easily cut & machined with standard HSS cutting tools
• Produces less dust and more chips
• Environmentally friendly
• Can handle continuous exposure to temperatures of up to 200°F
• Structurally stable - lasts up to 10 times longer than wood
• Meets flammability burn test requirements of ASTM D-1692-74, Far 25.853, Mil-P-26514 and ASTM D635

Use our density selector to find a practical starting point for your application. Results are general recommendations, not exact specifications or engineering calculations.

To get a suggested starting density, choose the application, maximum process temperature, and performance priorities.

While HDU is naturally resistant to the elements, it requires proper priming to achieve a professional finish. HDU is non-porous, so paint sits on the surface rather than soaking in. Specialized primers like PB-Resin or high-quality water-based primers are recommended. Once primed, it accepts almost any paint system, including latex, oil-based, and automotive enamels, allowing for vibrant, long-lasting displays. To ensure a quality finish:

1. Prime: Use PB-Resin or a high-solids water-based primer to fill the cell structure.
2. Paint: Compatible with all standard finishes including automotive urethanes, enamels, and acrylics.
3. No Outgassing: Precision Board is "cured" during manufacturing, so it won't bubble your finish even in direct sunlight.

Selecting the right density can make the difference between project success and failure. We offer Precision Board PBLT (Low Temperature) in a wide range of weights (lbs/cubic foot):

• Ultra-Lightweight (PBLT-4, PBLT-6, PBLT-8): Large-scale indoor displays, stage sets, and lightweight mock-ups
• Standard Signage & Display (PBLT-15, PBLT-20): Outdoor dimensional signage and architectural elements
• Industrial & Tooling Grade (PBLT-25, PBLT-30): Precision tooling, patterns, and foundry work
• High-Impact & Precision (PBLT-40, PBLT-48): High-precision master models, aerospace check fixtures, and heavy-duty industrial tooling

Need a different density? While we offer the PBLT range listed above, we have the logistics network to source and deliver any custom PBLT density or High-Temperature (PBHT) board your specific application requires.

For a general starting point, see our quick selector. For a more detailed list, please see the Precision Board Application Chart.