Modified Aliphatic Amine Adduct (Low Blush)

Modified Aliphatic Amine Adduct (Low Blush) is a high-performance epoxy hardener produced by pre-reacting a polyamine (typically DETA or TETA) with a limited amount of epoxy resin, diluent, or other modifying agent to produce a larger-molecule adduct. This modification dramatically reduces the tendency toward amine blush — the greasy carbonate film that forms on amine-cured epoxy surfaces under humid or cold conditions — which is the primary aesthetic and adhesion defect associated with neat aliphatic amines. The adduct form also provides longer pot life, lower vapor pressure, reduced skin sensitization risk, and better compatibility with thick-film applications compared to raw polyamines. This grade is designed for use in coastal, marine, and high-humidity environments where traditional amine hardeners fail to produce acceptable surface quality. At the recommended use temperature of 10–35°C, it achieves full room-temperature cure with BPA epoxy resins at a mix ratio of approximately 30–40 phr. Cured laminates exhibit excellent adhesion, good chemical resistance, and impact toughness suitable for marine and infrastructure composite applications.