CNC and Modeling Foam (Rigid Polyurethane Foam) - High Density 31lb/ft3
High Density U31 CNC and Modeling Foam by Duna
Our foam is perfect for 3D models with intricate shapes and layers using a CNC or hand shaping. It is hard to find in small sizes (our starting size is 12” x 12”when you would normally have to buy at least 4' x 4' or larger). It is dust-free, easy to sand and paint and more durable and attractive than Home Depot insulation foam.
High density CORAFOAM® (HDU) is an innovative polyurethane substrate used for a variety of applications in the signage, modeling, aerospace, composite, architectural and design industries. With its excellent workability, grain-free consistency (no dust) and broad range of densities, CORAFOAM® provides solutions to craftsmen and engineers alike.
These characteristics, combined with polyurethane natural resistance to atmospheric agents, most solvents, and moisture, make CORAFOAM® polyurethane an ideal replacement for wood and other materials in signage, patternmaking, composite layup tooling, thermoforming, and prototyping applications. It can be sanded for beautiful results.
CORAFOAM® can be cut with anything that can cut wood, including CNC machines, standard woodworking tools, and waterjet cutters. Its closed cellular structure and absence of fibers or granular structure result in crisp, excellently defined edges after fabrication. The heart in the photo was cut with a kitchen knife and sanded so you can make beautiful objects easier than with wood.
It is also impermeable by any type of liquid, including water and solvents, making it much better suited for severe weather conditions or harsh marine environments than many other materials.
Almost any type of adhesive can be used to bond CORAFOAM®. Because it is a polyurethane foam, polyurethane adhesives such as DUNABOND work extremely well, but it is also possible to use epoxies and other types of adhesive
Due to its ultra-smooth surface, CORAFOAM® is compatible with almost any type of primer or paint. Generally, it is easiest to use a highbuild (primer with high solid content) with CORAFOAM®, but it is not mandatory. Any high-quality exterior grade primer will work with CORAFOAM®.
The most “bulletproof” method of attaching fasteners to CORAFOAM® is to drill a hole that is slightly wider and deeper than the fastener, fill it with epoxy or polyurethane resin, set the fastener in and let it cure.
Due to its grain-free structure, in many situations it is recommended to reinforce CORAFOAM® by using a backer or adding reinforcement in strategic areas, or by building a frame.
NOTE: This is rigid foam, not suitable for cushioning.
- High Density (HD) - U Series - U31
- 31 lb/ft3
- Taupe color
- Interior and exterior usage
- Will produce chips instead of dust when cut on CNC.
- Grain free consistency
- Ultra smooth surface makes for easier finishing
- Can be fabricated with anything that can cut wood.
- Closed-cell, will not absorb water.
- Can be easily made to look like wood.
- Sign Making
- Pattern Making
- Core - Material
- Vacuum Forming
- Prop and Set Design
- Wood replacement for architectural elements
- Thermoforming master models
- Composite layup tools