Dow ISONATE™ 240 MDI Prepolymer

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Dow ISONATE™ 240 MDI Prepolymer
Categories:	Fluid
Material Notes:	ISONATE™ 240 MDI prepolymer is a modified MDI compound produced by reacting high-purity diphenylmethane diisocyanate with a high molecular weight polyester polyol, resulting in a material with good storage stability down to 72°F. This medium-viscosity product may be formulated with conventional polyether or polyester polyols and short chain diols or triols to yield high physical property elastomers or microcellular foams via the cast, low pressure or RIM-dispensing processes. Information provided by Dow
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Physical Properties	Original Value	Comments

Density	1.22 g/cc
Viscosity	1500 cP
Vapor Pressure	<= 0.0000100 torr

Chemical Properties	Original Value	Comments
Acid Value	0.020	% as HCl

Thermal Properties	Original Value	Comments
Heat of Vaporization	360 J/g
CTE, linear	737 µm/m-°C @Temperature 20.0 °C	volumetric
Specific Heat Capacity	1.80 J/g-°C
Thermal Conductivity	0.000300 cal cm/sec-cm²-°C
Boiling Point	314 °C
Decomposition Temperature	230 °C
Flash Point	>= 177 °C	Closed Cup; ASTM D93

Descriptive Properties
Hydrolyzable Chloride ppm	50
Isocyanate Equivalent Weight	225
NCO Content wt%	18.7

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