FR-4700 - A High Temp Tooling Board Ideal for Prototype Machining

General Plastics’ advanced LAST-A-FOAM® FR-4700 high-temperature polyurethane foam tooling boards can handle peak temperatures up to 400 °F (200 °C) and continuous-use temperatures up to 350 °F (177 °C) – considerably more than other products on the market. This series is non-abrasive and can be machined with basic high-speed steel (HSS) cutting tools. It can also be cut cleanly with water jets and traditional wood-carving tools. Economical and dimensionally stable, this stiff foam board is perfect for prototype machining, vacuum forming, pattern making, high-temperature curing prepregs, and other limited-run tooling where traditional metal dies are too expensive. The FR-4700 high-temperature series of high-density foam is available in thicknesses up to 12” in 18-lb. densities, and up to 11” in 30- and 40-lb. densities. This high-performance material is an exceptional choice for all of high-temperature requirements.


The main advantages of the FR-4700 are as follows:

  • Highly machinable
  • Dimensionally stable
  • Withstands peak temperatures up to 400 °F
  • Supports continuous-use temperatures up to 350 °F
  • Consistently uniform


The main applications of the FR-4700 are as follows:

  • Pattern making
  • Prototype machining
  • Vacuum forming
  • Tool proofing
  • Master model making
  • Prepreg composite layup tools
  • Monolithic tools and molds
  • High-temperature curing prepregs
  • Master plugs and molds
  • Limited-run tooling

Sizing Chart


Products Density (lbs/ft3) Height Width Length
FR-4718 18 12 48 96
FR-4730 30 11 24 96
FR-4740 40 11 24 96



Products Density (kg/m3) Height Width Length
FR-4718 288 31 122 243
FR-4730 481 28 61 243
FR-4740 641 28 61 203


Shown are maximum standard stock sizes based on density. Custom sizes are available. Cut sizes are available from 0.125 inches (3.175 mm) up to standard stock heights as listed above.

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