• Excellent machinability
  • Precise edges and corners
  • High thermal resistance
  • Chemical resistance
  • Dimensional stability
  • Screw retention


  • Composite lay up tools
  • Master plugs and molds
  • Vacuum forming
  • High temperature prepreg tooling
  • Master model making
  • Prototyping, modelling, tooling
  • Thermal breaks
  • Cryogenic pipe supports

BLUE CORINTHO® is an entirely new style of polyurethane modeling and tooling boards designed by our R & D team to be the DUNA Group’s flagship offering to all sectors requiring a high degree of precision, detail, and machinability (both manual and CNC machines).

The BLUE CORINTHO® line of polyurethane boards features an exceptional surface finish, totally devoid of granules and imperfections. Additionally, thermal resistance properties of these boards are noticeably higher than standard polyurethanes. This serves to reduce common expansion and contraction problems typical in mold making and high temperature tooling, and also offers a very high degree of dimensional stability.

Unlike ordinary polyurethane sheets, the unique porosity of BLUE CORINTHO® polyurethane materials allows a high absorption of adhesive when bonding, significantly reducing bond line thickness. The porosity also allows BLUE CORINTHO® polyurethane to be adhered to vacuum tables without the use of clamps or screws.

The chemical resistance of BLUE CORINTHO® polyurethane also allows it to be compatible with any type of paint or surface treatment (including solvent-based).

With densities from 700 through 800 kg/m³ (43 lb/ft³-49 lb/ft³), the BLUE CORINTHO® family of modeling and tooling polyurethane boards offers a broad selection of material for use in modeling, visual communication, engraving, bas-relief, as well as high-temperature tooling and prototyping.

It may also be used for thermoforming, mold making, composite layup tooling, autoclave tooling, and other high-temperature applications.

The BLUE CORINTHO® family is currently composed of three materials:


Polyurethane boards developed for modeling applications, tooling and rapid prototyping. Along with the other products in the CORINTHO® line, it offers dimensional stability and chemical resistance.


BLUE CORINTHO® HT is a polyurethane material designed to withstand high temperatures; through autoclave testing at 350°F it has proven to be an extemely stable support for master models for carbon molds, male thermoform molds, thermal cutting media at high temperature, and also the production of molds for direct lamination of high-temperature curing prepregs.


The latest polyurethane boards material developed by our R&D, BLACK CORINTHO® has an ultra-low coefficient of linear thermal expansion and a high dimensional stbility at 356°F. The high thermal conductivity allows for faster autoclave and over processing times. This, coupled with its excellent machining capabilities, make it the right choice for mold making, composite layup tooling, thermoform molds, and other tooling applications.

Nominal density EN ISO 845/EN 1602/ASTM D1622 lb/ft³ 43.6 43.6 49.9 68.7
Compressive Resistance – Parallel (74°F) EN 826/ASTM D1621 psi 3190 4061 2176 5801
Compressive Modulus – Parallel (74°F) EN 826/ASTM D1621 psi 40610 65267 31908 78900
Flexural strength – Parallel, Met.I (74°F) EN 12089/ASTM C203 psi 2465 3336 1015 2465
Flexural modulus – Parallel (74°F) EN 12089/ASTM C203 psi 91374 108778 95725 237862
Max. strain, Met.I (74°F) EN 12089/ASTM C203 length/length 0.032 0.035 0.012 0.014
Thermal conductivity - Initial (75°F) EN 12667/ASTM C518 BTU·in/hr·ft²·°F 0.66 0.75 1.83 2.63
Fire reaction DIN 4102 Class B2 B2 B2 B2
Fire reaction (maximum extent of burnt length) EN ISO 3582 inches <0.39 <0.39 <0.39 <0.39
Fire reaction (extinguishing time) EN ISO 3582 s <10 <10 <10 <10
Fire reaction UL 94 Class HBF HBF HBF HBF
Fire reaction FAR 25-853A n.d. 12"/60" Passed 12"/60" Passed 12"/60" Passed
Fire reaction EN 13501 Euroclass E E E E
Hardness EN ISO 868/ASTM D2240 Shore D 57 63 50 60
Operating temperature °F -328/+248 -328/+400 +32/+400 +32/+400
Glass transition temperature (Tg) EN ISO 113572/ASTM E1356 °F 293 509 464 464
CTE (104/230°F) ASTM E228/EN 13471 1/°F·10E-6 40 11 3 5
CTE (+248/+356 °F) ASTM E228/EN 13471 1/°F·10E-6 n.d. 8 21 17
CTE (+356/+400°F) ASTM E228/EN 13471 1/°F·10E-6 n.d. 8 22 20