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AL20-2 B is part B of a liquid epoxy crosslinking hardener. Also called a duroplast, this organic compound is an oily liquid that is colorless but, like many amines, assumes a yellowish color due to impurities resulting from air-oxidation. It is soluble in polar solvents. The branched isomer tris(2-aminoethyl)amine and piperazine derivatives may also be present in commercial samples.