eMKay Plastics Ltd | ROHACELL 31 Polymethacrylimide (PMI) Rigid Foam Sheet

Tech Data- ROHACELL 31 Polymethacrylimide (PMI) Rigid Foam Sheet

Subcategory: Composite Core Material; Polymer; Polymethacrylimide; Thermoset

Material Notes:

ROHACELL 31 is the lowest 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	0.032 g/cc	0.00116 lb/in_	ASTM D 1622-63
Water Absorption	19.5 %	19.5 %	Equilibrium at 98% RH
Moisture Absorption at Equilibrium	1.5 %	1.5 %	15% RH
Moisture Absorption at Equilibrium	2.9 %	2.9 %	30% RH
Moisture Absorption at Equilibrium	4.7 %	4.7 %	50% RH
Moisture Absorption at Equilibrium	6 %	6 %	65% RH
Water Absorption at Saturation	13 %	13 %	Volume %; 50 days immersion at 20ƒC.
Moisture Expansion	Max 1 %	Max 1 %	50 days immersion at 20ƒC.
Mechanical Properties
Tensile Strength, Ultimate	0.979 MPa	142 psi	ASTM D 638-68
Elongation @ break	3.5 %	3.5 %	ASTM D 638-68
Modulus of Elasticity	0.0353 GPa	5.12 ksi	ASTM D 638-68
Flexural Yield Strength	0.786 MPa	114 psi	ASTM D 790-66
Compressive Yield Strength	0.393 MPa	57 psi	ASTM D 1621-64
Shear Modulus	0.0128 GPa	1.85 ksi	ASTM C 273-61
Shear Modulus	0.0137 GPa	1.99 ksi	ASTM D 2236-69
Shear Strength	0.393 MPa	57 psi	ASTM C 273-61
Electrical Properties
Dielectric Constant	1.05	1.05	5.0 GHz
Dielectric Constant	1.05	1.05	10.0 GHz
Dielectric Constant	1.06	1.06	26.0 GHz
Dielectric Constant	1.08	1.08	2.0 GHz
Dissipation Factor	0.0001	0.0001	2.0 GHz
Dissipation Factor	0.0004	0.0004	5.0 GHz
Dissipation Factor	0.0008	0.0008	10.0 GHz
Dissipation Factor	0.0034	0.0034	26.0 GHz
Surface Resistance	2E+13 ohm	2E+13 ohm
Thermal Properties
CTE, linear -100ƒC	25 µm/m-ƒC	13.9 µin/in-ƒF
CTE, linear 20ƒC	37 µm/m-ƒC	20.6 µin/in-ƒF	ASTM D 696-70
Thermal Conductivity	0.031 W/m-K	0.215 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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Tel: +44 (0) 1603 746 000 | Fax: +44 (0) 1603 746 001 | Email: info@emkayplastics.co.uk

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Material Notes:

Physical Properties

Metric

English

Comments

Density

0.032 g/cc

0.00116 lb/in_

ASTM D 1622-63

Water Absorption

19.5 %

19.5 %

Equilibrium at 98% RH

Moisture Absorption at Equilibrium

1.5 %

1.5 %

15% RH

Moisture Absorption at Equilibrium

2.9 %

2.9 %

30% RH

Moisture Absorption at Equilibrium

4.7 %

4.7 %

50% RH

Moisture Absorption at Equilibrium

6 %

6 %

65% RH

Water Absorption at Saturation

13 %

13 %

Volume %; 50 days immersion at 20ƒC.

Moisture Expansion

Max 1 %

Max 1 %

50 days immersion at 20ƒC.

Mechanical Properties

Tensile Strength, Ultimate

0.979 MPa

142 psi

ASTM D 638-68

Elongation @ break

3.5 %

3.5 %

ASTM D 638-68

Modulus of Elasticity

0.0353 GPa

5.12 ksi

ASTM D 638-68

Flexural Yield Strength

0.786 MPa

114 psi

ASTM D 790-66

Compressive Yield Strength

0.393 MPa

57 psi

ASTM D 1621-64

Shear Modulus

0.0128 GPa

1.85 ksi

ASTM C 273-61

Shear Modulus

0.0137 GPa

1.99 ksi

ASTM D 2236-69

Shear Strength

0.393 MPa

57 psi

ASTM C 273-61

Electrical Properties

Dielectric Constant

1.05

1.05

5.0 GHz

Dielectric Constant

1.05

1.05

10.0 GHz

Dielectric Constant