MK Plastics Technical Data

ROHACELL® IG-F Polymethacrylimide Foam

ROHACELL® IG-F is a closed-cell rigid foams based on polymathacrylimide (PMI) chemistry, which do not contain any CFC's.

is a foam grade with a finer cell structure but the same mechanical and thermal properties as ROHACELL® IG. Because of the smaller size of its cells, ROHACELL® IG-F takes up less resin at the surface, where the cells have been cut open.

is particularly suitable for prepreg processing, but can also be used in, for example, resin infusion and RTM processes up to temperatures of 130°C and pressures of 0.3 MPa.

The thermo-formability of ROHACELL® provides a tremendous manufacturing advantage.
ROHACELL® IG-F are also easy to shape by machining.

Subcategory: Composite Core Material; Polymer; Polymethacrylimide; Thermoset

Material Notes:

ROHACELL 51 is a low density grade and a very high strength:weight ratio.

General ROHACELL Information: ROHACELL is a closed-cell rigid expanded plastic material for lightweight sandwich construction. It has excellent mechanical properties, high dimensional stability under heat, solvent resistance and, particularly at low temperature, a low thermal conductivity. The strength and moduli values are the highest for any foamed plastic in its density range. ROHACELL is manufactured by hot forming of methacrylic acid/methacrylonitrile copolymer sheets. During foaming this copolymer is converted to polymethacrylimide.


Rohacell 51 IG-F

Properties Metric English Comments
Physical Properties
Density 0.0513 g/cc 0.00185 ib/in_ ASTM D 1622-63
Water Absorption 17.4% 17.4% Equilibrium at 98% RH
Moisture Absorption at Equilibrium 1.3% 1.3% 15% RH
Moisture Absorption at Equilibrium 2.6% 2.6% 30% RH
Moisture Absorption at Equilibrium 4.2% 4.2% 50% RH
Moisture Absorption at Equilibrium 5% 5% 65% RH 
Water Absorption at Saturation 15% 15% Volume %; 50 days immersion at 20 fC.
Moisture Expansion Max 2% Max 2%  50 days immersion at 20 fC.
Mechanical Properties
Tensile Strength, Ultimate 1.86 MPa 270 psi ASTM D 638-68
Elongation @ break 4% 4% ASTM D 638-68
Modulus of Elasticity 0.0686 9.95 ksi ASTM D 638-68 
Flexural Yield Strength 1.57 MPa 228 psi ASTM D 790-66 
Compressive Yield Strength 0.883 MPa  128 psi  ASTM D 1621-64 
Shear Modulus 0.0186  2.7 ksi  ASTM C 273-61 
Shear Modulus 0.0206 GPa  2.99 ksi   ASTM D 2236-69 
Shear Strength 0.786  114 psi   ASTM C 273-61 
Electrical Properties
Dielectric Constant 1.06 1.06  10.0 GHz 
Dielectric Constant 1.07 1.07  2.0 GHz 
Dielectric Constant 1.09  1.09  2.0 GHz 
Dielectric Constant 1.11 1.11  26.0 GHz 
Dissipation Factor 0.0002 0.0002  2.0 GHz 
Dissipation Factor 0.0004 0.0004  5.0 GHz
Dissipation Factor 0.0011 0.0011 10.0 GHz
Dissipation Factor 0.005 0.005  26.0 GHz 
Surface Resistance  9E+12 ohm 9E+12 ohm   
Thermal Properties
CTE, linear -100fC 24 µm/m-ƒC 13.3 µin/in-ƒF   
CTE, linear 20fC 33 µm/m-ƒC 18.3 µin/in-ƒF ASTM D 696-70
Thermal Conductivity  0.029 W/m-K 0.201 BTU-in/hr-ft_-ƒF ASTM C 177-63
Maximum Service
Temperature, Air
180 ƒC 356 ƒF Dimensional stability per DIN 53424
Oxygen Index 19 - 20% 19 - 20%  
Descriptive Properties
Colour White