Covestro Desmocap® 12 A Epoxy Coating

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Covestro Desmocap® 12 A Epoxy Coating
Categories:	Polymer; Thermoplastic; Adhesives, Sealants, and Coatings; Thermoset; Epoxy
Material Notes:	Desmocap 12 A is a linear polyurethane prepolymer with crosslinking blocked isocyanate groups. As a raw material for the flexibilisation of epoxy resins and in the formulation of flexible coatings and sealants. Desmocap 12 A yields softer and more flexible systems than Desmocap 11 A. Composition A: Epoxy value of 0.5 – 0.55: 70, Desmocap 12A prepolymer: 30, Laromin C 260: 24.5; Composition B: Epoxy value of 0.5 – 0.55: 50, Desmocap 12A prepolymer: 50, Laromin C 260: 18.5; Composition D: Epoxy value of 0.5 – 0.55: 30, Desmocap 12A prepolymer: 70, Laromin C 260: 12.5 Properties / Applications: Desmocap 12 A can be used to formulate curable, liquid, solvent-free polyurethane systems. The polyamines normally used with epoxy resins are suitable curing agents. The best results are obtained with cycloapliphatic diamines, e.g. Laromin® C 260, Ancamine® XT, TCD-Diamin and xylenediamine. When combined with epoxy resins, Desmocap 12 A takes over the function of the reactive flexibiliser. As with any product, use of Desmocap 12 A in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability. Information provided by Covestro
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Physical Properties	Metric	English	Comments

Specific Gravity	1.04 g/cc	1.04 g/cc
Solids Content	100 %	100 %
Water Absorption	0.70 %	0.70 %	Composition A
	0.80 %	0.80 %	Composition B
	2.3 %	2.3 %	Composition C
Viscosity	23000 - 43000 cP	23000 - 43000 cP

Mechanical Properties	Metric	English	Comments
Hardness, Shore D	45	45	Composition C
	72	72	Composition B
	75	75	Composition A
Tensile Strength at Break	12.8 MPa	1860 psi	Composition C
	34.2 MPa	4960 psi	Composition B
	46.4 MPa	6730 psi	Composition A
Elongation at Break	7.0 %	7.0 %	Composition A
	66 %	66 %	Composition B
	200 %	200 %	Composition C

Thermal Properties	Metric	English	Comments
Flash Point	214 °C	417 °F	Cleveland Open Cup

Optical Properties	Metric	English	Comments
Gardner Color Number	<= 4.0	<= 4.0

Descriptive Properties
Appearance	Clear, slightly yellow liquid
Content	1.8-2.1%		Blocked NCO

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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PCOVEST0278 / 202061

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