DIAB Rigid Foam IPN 20-649 Type 1

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DIAB Rigid Foam IPN 20-649 Type 1 (discontinued **)
Categories:	Other Engineering Material; Composite Core Material; Polymer; Thermoset
Material Notes:	This material was primarily developed for insulation of liquid H₂ fuel tanks for launch vehicles. The material, which is referred to as an Inter-Polymer-Network, consists of a polymeric alloy of a highly cross-linked polyamide-urea and a ductile linear vinyl polymer. The cryogenic properties are good and the material exhibits excellent short-term capability at high temperatures. IPN 20-649 us thermo-formable. Information provided by DIAB, Inc.
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Physical Properties	Original Value	Comments

Density	2.48 - 3.12 lb/ft³

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	0.900 MPa	at 20K
	100 - 145 psi	at 296 K; in Plane
Elongation at Break	1.5 %	at 20K
	5.0 %	at 296 K; in Plane
	10 %	at 296 K; Shear Strain; all directions
Tensile Modulus	2900 - 4350 psi	at 296K; in Plane
Compressive Strength	72.5 - 101.5 psi	at 296 K; Through Plane
Compressive Modulus	0.0500 GPa	at 296 K; Through Plane; ASTM D1621-B
	2900 psi	at 296 K; Through Plane; ASTM D1621-A
Poissons Ratio	0.30
Shear Modulus	1.74 - 2.465 ksi	at 296K; all directions
Shear Strength	58.0 - 87.0 psi	at 296 K; all directions

Thermal Properties	Original Value	Comments
CTE, linear	40.0 µm/m-°C @Temperature -183 - 37.0 °C
Thermal Conductivity	0.0150 W/m-K	100K
	0.0270 W/m-K	210K
	0.0330 W/m-K	310K

**
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PDIAB66 / 29837

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