RAMPF® MB-0720

Polyurethane Board for Modeling

Key Properties of Rampf MB-0720 include:

  • Fine surface structure
  • Low coefficient of thermal expansion
  • Good dimensional stability
  • Good compressive and flexural strength

Typical Properties

ColorBrown
Density (ρ)45 lb/ft3 [0.72 g/cm3]
Hardness60 – 65 Shore D
Flexural Strength3,600 – 4,400 psi [25 – 30 MPa]
Compressive Strength2,900 – 3,600 psi [20 – 25 MPa]
Coefficient of Thermal Expansion (CTE)(28 – 31) x 10-6 in/in°F [(50.4 – 55.8 ) x 10-6 m/m/°C]
Deflection Temperature, HDT167 – 176°F [75 – 80°C]

Available Sizes

1.0” x 19.7 x 59.1 (25mm x 500mm x 1500mm)
2.0” x 19.7 x 59.1 (50mm x 500mm x 1500mm)
3.0” x 19.7 x 59.1 (75mm x 500mm x 1500mm)
3.9” x 19.7 x 59.1 (100mm x 500mm x 1500mm)
5.9” x 19.7 x 59.1 (150mm x 500mm x 1500mm)
7.9” x 19.7 x 59.1 (200mm x 500mm x 1500mm)

Machining

Cutters:

Roughing – 1”(25.4mm) Hog Ball End Mill, 4-flute, HS Steel 8% Cobalt
Finishing – 5/8”(15.875mm) Ball End Mill, 2-flute carbide

Depth:

Roughing – varied from ¼”(6.35mm) to 2.5”(63.5mm) with 40% stepover
Finishing – 1/8”(3.175mm)deep leaving 0.002” (0.050mm) scallop height

Blades: 

Use carbide offset-tooth blade for faster cutting and less binding

Roughing speed: 1,600RPM ∙ Roughing Feed 40IPM
Finishing speed: 10,000RPM ∙ Finishing feed 100IPM

Safety

Good workplace ventilation is to be ensured during processing. At the same time, the employer’s liability insurance association’s industrial hygiene safety regulations regarding the handling of reaction resins and their hardeners are to be observed. Please take heed of the appropriate safety data sheets.

The material should be stored flat and in a dry place. Temperature variations should be avoided during storage and transportation.

The product should be machined at ambient room temperature (68-77°F (20-25°C)).

Applications

  • Master Models
  • Cubing Models
  • Patterns