Dow ISONATE™ 181 MDI Prepolymer

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Dow ISONATE™ 181 MDI Prepolymer
Categories:	Fluid
Material Notes:	ISONATE™ 181 MDI prepolymer is a modified MDI compound produced by reacting high-purity diphenylmethane diisocyanate with sufficient glycol to allow easy handling down to 80°F. This medium-viscosity, super-cooled liquid provides more rapid compatibility between isocyanates and polyols, which increases the effectiveness of catalysts present and usually results in a more easily controlled polymer reaction. Information provided by Dow
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Physical Properties	Metric	English	Comments

Density	1.221 g/cc	0.04411 lb/in³
Viscosity	770 cP	770 cP
Viscosity Measurement	5.0 - 10	5.0 - 10	[cps/mo.] Viscosity growth
Vapor Pressure	<= 1.30e-8 bar	<= 0.00000975 torr

Chemical Properties	Metric	English	Comments
Acid Value	0.010	0.010	HCl content, %

Thermal Properties	Metric	English	Comments
Heat of Vaporization	360 J/g	155 BTU/lb
CTE, linear	1330 µm/m-°C @Temperature 20.0 °C	737 µin/in-°F @Temperature 68.0 °F
Specific Heat Capacity	1.80 J/g-°C	0.430 BTU/lb-°F
Thermal Conductivity	0.126 W/m-K	0.870 BTU-in/hr-ft²-°F
Boiling Point	314 °C	597 °F
Decomposition Temperature	230 °C	446 °F
Flash Point	>= 177 °C	>= 351 °F	ASTM D93 Closed Cup

Descriptive Properties
NCO Content %	23

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PDOW1385 / 30603

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