Precision Board HDU (Tooling Board)
Coastal Enterprises
Overview
High-density polyurethane (HDU) tooling board — the go-to material for pattern making, master patterns, and CNC sign carving. Available in densities from 6 PCF (fast, rough) to 60 PCF (fine detail). No grain or porosity — machines identically in all directions. Can be painted, primed, and coated.
Properties
Difficulty
beginner
Flexibility
rigid
Layer Adhesion
good
Enclosure
no
Heated Bed
no
Dry Storage
no
Pros
- No wood grain — machines identically in all directions
- Holds exceptional detail — better than any wood
- Dimensionally stable — no warping or moisture movement
- Can be painted, primed, and epoxy-coated
- Machines fast and clean — minimal dust vs wood
- Multiple densities for different applications
- Can be glued and laminated for large patterns
Cons
- Expensive — $3-15/board-foot depending on density
- Not structural
- Can chip on thin features with aggressive settings
- Fine dust — good dust collection needed
- Not temperature resistant above 120°C
- Cannot be steam bent
Best For
- Foundry master patterns|Automotive clay model tooling|Architectural and marine patterns|CNC sign carving|Prototype styling bucks|Composite mold masters|Museum replica fabrication
Avoid For
- Structural parts|Outdoor permanent installation|High-temperature applications|Load-bearing
Storage
Store flat. Seal with spray primer or epoxy after machining to prevent moisture absorption (especially lower densities). Fine dust — use dust collection. Available from specialty plastics distributors.
Brands
Coastal Enterprises Precision BoardGeneral Plastics Last-A-FoamHuntsman RenShape