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Master Bond adhesives

Evonik Rohacell® 70 Polymethacrylimide (PMI) Rigid Foam Sheet  (discontinued **)
Categories: Other Engineering Material; Composite Core Material; Polymer; Thermoset; Polymethacrylimide
Material Notes: ROHACELL 71 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 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.

Information supplied by Emkay Plastics, Ltd.
Vendors: No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
 
Physical PropertiesMetricEnglishComments
Density 0.0753 g/cc0.00272 lb/in³ASTM D1622-63
Moisture Absorption at Equilibrium 1.2 %1.2 %15% RH
 2.4 %2.4 %30% RH
 3.6 %3.6 %50% RH
 4.3 %4.3 %65% RH
 15.5 %15.5 %98% RH
Water Absorption at Saturation 16 %16 %50 days immersion at 20°C.
Moisture Expansion <= 3.0 %<= 3.0 %50 days immersion at 20°C.
 
Mechanical PropertiesMetricEnglishComments
Tensile Strength, Ultimate 2.74 MPa398 psiASTM D638-68
Elongation at Break 4.5 %4.5 %ASTM D638-68
Modulus of Elasticity 0.0903 GPa13.1 ksiASTM D638-68
Flexural Yield Strength 2.45 MPa356 psiASTM D790-66
Compressive Yield Strength 1.47 MPa213 psiASTM D1621-64
Shear Modulus 0.0284 GPa4.12 ksiASTM C273-61
Shear Strength 1.28 MPa185 psiASTM C273-61
 
Electrical PropertiesMetricEnglishComments
Surface Resistance 5.50e+12 ohm5.50e+12 ohm
Dielectric Constant  1.08
@Frequency 2.00e+9 Hz		1.08
@Frequency 2.00e+9 Hz
 1.1
@Frequency 2.60e+10 Hz		1.1
@Frequency 2.60e+10 Hz
 1.11
@Frequency 5.00e+9 Hz		1.11
@Frequency 5.00e+9 Hz
 1.13
@Frequency 1e+10 Hz		1.13
@Frequency 1e+10 Hz
Dissipation Factor  0.00030
@Frequency 2.00e+9 Hz		0.00030
@Frequency 2.00e+9 Hz
 0.00070
@Frequency 5.00e+9 Hz		0.00070
@Frequency 5.00e+9 Hz
 0.0018
@Frequency 1e+10 Hz		0.0018
@Frequency 1e+10 Hz
 0.0076
@Frequency 2.60e+10 Hz		0.0076
@Frequency 2.60e+10 Hz
 
Thermal PropertiesMetricEnglishComments
CTE, linear  30.0 µm/m-°C
@Temperature -100 °C		16.7 µin/in-°F
@Temperature -148 °F
 35.0 µm/m-°C
@Temperature 20.0 °C		19.4 µin/in-°F
@Temperature 68.0 °F		ASTM D696-70
Thermal Conductivity 0.0300 W/m-K0.208 BTU-in/hr-ft²-°FASTM C177-63
Maximum Service Temperature, Air 180 °C356 °FDimensional stability per DIN 53424
Oxygen Index 19 - 20 %19 - 20 %
 
Descriptive Properties
ColorWhite

**
Materials flagged as discontinued () are no longer part of the manufacturer’s standard product line according to our latest information. These materials may be available by special order, in distribution inventory, or reinstated as an active product. Data sheets from materials that are no longer available remain in MatWeb to assist users in finding replacement materials.

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Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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PROHA02 / 66307




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