eMKay Plastics Ltd | ROHACELL 51 Polymethacrylimide (PMI) Rigid Foam Sheet

Tech Data- ROHACELL 51 Polymethacrylimide (PMI) Rigid Foam Sheet

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.

Physical Properties	Metric	English	Comments
Density	0.0513 g/cc	0.00185 lb/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 20ƒC.
Moisture Expansion	Max 2 %	Max 2 %	50 days immersion at 20ƒC.
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 GPa	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 GPa	2.7 ksi	ASTM C 273-61
Shear Modulus	0.0206 GPa	2.99 ksi	ASTM D 2236-69
Shear Strength	0.786 MPa	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	5.0 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 -100ƒC	24 µm/m-ƒC	13.3 µin/in-ƒF
CTE, linear 20ƒC	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

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Material Notes:

Physical Properties

Metric

English

Comments

Density

0.0513 g/cc

0.00185 lb/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 20ƒC.

Moisture Expansion

Max 2 %

Max 2 %

50 days immersion at 20ƒC.

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 GPa

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 GPa

2.7 ksi

ASTM C 273-61

Shear Modulus

0.0206 GPa

2.99 ksi

ASTM D 2236-69

Shear Strength

0.786 MPa

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