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FR-6700 Aerospace Grade is a CFC-free, rigid, closed-cell, flame-retardant polyurethane foam available in densities ranging from 10 to 25 pounds per cubic foot. It exhibits a high strength-to-weight ratio because of its cellular structure and cross-linked resin. Its closed-cell structure also makes this rigid polyurethane foam series highly resistant to water absorption, so it will not swell, crack or split on exposure to water. The HDU material is stable, inert and resistant to most chemicals and solvents. These characteristics make it an excellent replacement for wood. This series is non-abrasive and can be machined with standard high-speed steel (HSS) cutting tools. It can also be cut cleanly with water jets and traditional wood-carving tools. To save production time, General Plastics can pre-score FR-6700 boards for liquid resin infusion processes.

FR-6700 is specifically designed to satisfy the physical property, flammability performance and processing requirements of multiple aerospace and military specifications. These include Boeing BMS 8-133, McDonnell-Douglas DMS-1937, and Federal Aviation Regulation FAR 25.853 (a). We can supply certificate of conformance and test data upon request.

For greater flame-retardant properties, please inquire about our FR-6706P product.

For lower-density foams with comparable physical property characteristics, flammability, temperature resistance and chemical resistance performance, see LAST-A-FOAM® FR-3700 Performance Core Series.

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  • Honeycomb edge closeout for aircraft interior sandwich core panels used in overhead storage bins, passenger cabin dividers, galleys, and lavatories
  • Models and design prototypes
  • Composite core, especially where flame retardation is important
  • Vacuum form dies and mold patterns


  • Rigid and closed-cell
  • Flame-retardant
  • High strength-to-weight ratio resulting from cross-linked resin
  • Inert and resistant to most chemicals and solvents
  • Easily shaped with common woodworking tools
  • Temperature resistance from 250ºF to 275ºF

Sizing Chart


FR-6710 10 24 48 96
FR-6712 12 24 48 96
FR-6715 15 24 48 96
FR-6718 18 18 18 100
FR-6718 18 18 48 96
FR-6720 20 18 18 100
FR-6720 20 18 48 96
FR-6725 25 18 18 100


FR-6710 160 60 120 240
FR-6712 192 60 120 240
FR-6715 240 60 120 240
FR-6718 288 45 45 250
FR-6718 288 45 120 240
FR-6720 320 45 45 250
FR-6720 320 45 120 240
FR-6725 400 45 45 250


Shown are maximum standard stock sizes based on density. Custom sizes are available. Cut sizes are available from .125 inches (3.175 mm) up to standard stock heights as listed above.