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An Ounce of Prevention... The Reliability of Field Methods for Detecting the Presence of Amine Blush on Epoxy Coatings

Shop and field conditions of high humidity and cool temperature during curing of amine-cured epoxy coatings can produce a haze or oily residue on the surface.  This is commonly referred to as “amine blush.”  The residue is caused by the presence of unreacted amine on the surface of the epoxy coating reacting with carbon dioxide and moisture in the air to form a carbamate. 

Product Number: 41205-190-SG
Author: Michael Orzechowski
Publication Date: 2005
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Shop and field conditions of high humidity and cool temperature during curing of amine-cured epoxy coatings can produce a haze or oily residue on the surface.  This is commonly referred to as “amine blush.”  The residue is caused by the presence of unreacted amine on the surface of the epoxy coating reacting with carbon dioxide and moisture in the air to form a carbamate. The reaction is propagated by cool temperatures and is exacerbated by increased film thickness and excess carbon dioxide (e.g., via use of portable gas heaters).  If undetected, the presence of an amine blush (in sufficient quantities) can cause intercoat delamination once the “blushed” coating is recoated.

Shop and field conditions of high humidity and cool temperature during curing of amine-cured epoxy coatings can produce a haze or oily residue on the surface.  This is commonly referred to as “amine blush.”  The residue is caused by the presence of unreacted amine on the surface of the epoxy coating reacting with carbon dioxide and moisture in the air to form a carbamate. The reaction is propagated by cool temperatures and is exacerbated by increased film thickness and excess carbon dioxide (e.g., via use of portable gas heaters).  If undetected, the presence of an amine blush (in sufficient quantities) can cause intercoat delamination once the “blushed” coating is recoated.

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