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ROHACELLﾆ 51 Polymethacrylimide (PMI) Rigid
Foam Sheet
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Subcategory: Composite
Core Material; Polymer; Polymethacrylimide; Thermoset
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ROHACELL 51
is a low density grade and a very high strength:weight ratio.
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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 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.
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Physical Properties
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Metric
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English
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Comments
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Density
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0.0513 g/cc
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0.00185 lb/in_
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ASTM D 1622-63
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Water Absorption
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17.4 %
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17.4 %
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Equilibrium at 98% RH
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Moisture Absorption at Equilibrium
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1.3 %
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1.3 %
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15% RH
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Moisture Absorption at Equilibrium
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2.6 %
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2.6 %
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30% RH
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Moisture Absorption at Equilibrium
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4.2 %
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4.2 %
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50% RH
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Moisture Absorption at Equilibrium
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5 %
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5 %
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65% RH
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Water Absorption at Saturation
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15 %
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15 %
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Volume %; 50 days immersion at 20イ.
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Moisture Expansion
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Max 2 %
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Max 2 %
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50 days immersion at 20イ.
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Mechanical Properties
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Tensile Strength, Ultimate
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1.86 MPa
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270 psi
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ASTM D 638-68
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Elongation @ break
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4 %
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4 %
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ASTM D 638-68
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Modulus of Elasticity
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0.0686 GPa
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9.95 ksi
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ASTM D 638-68
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Flexural Yield Strength
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1.57 MPa
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228 psi
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ASTM D 790-66
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Compressive Yield Strength
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0.883 MPa
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128 psi
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ASTM D 1621-64
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Shear Modulus
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0.0186 GPa
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2.7 ksi
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ASTM C 273-61
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Shear Modulus
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0.0206 GPa
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2.99 ksi
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ASTM D 2236-69
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Shear Strength
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0.786 MPa
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114 psi
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ASTM C 273-61
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Electrical Properties
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Dielectric Constant
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1.06
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1.06
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10.0 GHz
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Dielectric Constant
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1.07
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1.07
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2.0 GHz
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Dielectric Constant
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1.09
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1.09
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5.0 GHz
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Dielectric Constant
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1.11
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1.11
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26.0 GHz
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Dissipation Factor
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0.0002
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0.0002
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2.0 GHz
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Dissipation Factor
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0.0004
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0.0004
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5.0 GHz
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Dissipation Factor
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0.0011
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0.0011
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10.0 GHz
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Dissipation Factor
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0.005
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0.005
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26.0 GHz
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Surface Resistance
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9E+12 ohm
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9E+12 ohm
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Thermal Properties
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CTE, linear -100イ
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24 ｵm/m-イ
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13.3 ｵin/in-ェ
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CTE, linear 20イ
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33 ｵm/m-イ
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18.3 ｵin/in-ェ
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ASTM D 696-70
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Thermal Conductivity
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0.029 W/m-K
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0.201 BTU-in/hr-ft_-ェ
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ASTM C 177-63
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Maximum Service Temperature, Air
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180 イ
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356 ェ
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Dimensional stability per DIN 53424
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Oxygen Index
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19 - 20 %
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19 - 20 %
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Descriptive Properties
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Color
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White
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