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High reactivity with standard bisphenol-A and bisphenol-F epoxy resins.
Enables fast ambient-cure formulations without external heat input.
Delivers excellent chemical resistance, particularly to alkalis and solvents.
Low viscosity for easy handling and improved resin blend homogeneity.
Low volatility and favorable occupational hygiene profile compared to traditional amine hardeners.
Industrial flooring systems requiring rapid return-to-service.
Concrete repair mortars and anchoring compounds.
Electrical encapsulation and potting applications.
Adhesives for metal, concrete, and composite bonding.
Coatings for tanks, pipelines, and corrosion-prone infrastructure.
| Chemical Type | Modified aliphatic amine |
| Product Form | Liquid |
| Appearance | Pale yellow to amber clear liquid |
| Density (20 °C) | ~0.92–0.95 g/cm³ |
| Viscosity (25 °C) | 150–300 mPa·s |
| Amine Value | 420–460 mg KOH/g |
| Reactive Hydrogen Equivalent Weight | ~120–135 g/eq |
| Primary Applications | Ambient-cure epoxy systems for construction, industrial maintenance, and electrical insulation |
Q1: What is the primary chemical nature of Epoxy Curing Agent 2758?
A: Evonik Epoxy Curing Agent 2758 is a low-viscosity, aliphatic amine-based curing agent designed for ambient- and elevated-temperature epoxy systems. It features a tailored molecular structure to balance reactivity, flexibility, and reduced volatility compared to conventional aliphatic amines.
Q2: For which types of epoxy resins is this curing agent typically recommended?
A: It is especially compatible with standard liquid bisphenol-A and bisphenol-F epoxy resins, as well as novolac epoxies. Its formulation supports good miscibility and predictable gel times in both solvent-free and low-VOC coatings, adhesives, and composite matrix systems.
Q3: How does it perform in terms of pot life and cure speed under ambient conditions?
A: Epoxy Curing Agent 2758 offers extended pot life relative to highly reactive aliphatic amines—typically several hours at 23 °C—while still enabling practical handling and full cure within 24–48 hours without forced heating. Cure kinetics can be adjusted via temperature and stoichiometric ratio.
Q4: Is it suitable for applications requiring low surface tack and high surface hardness?
A: Yes—this curing agent contributes to low surface tack during cure and delivers excellent final hardness, abrasion resistance, and chemical resistance in finished films and castings, making it well-suited for protective coatings and structural composites.
Q5: What safety and handling considerations apply during industrial use?
A: As with most amine-based curing agents, appropriate personal protective equipment—including gloves, eye protection, and adequate ventilation—is recommended. The product is formulated to minimize skin sensitization potential, but users should consult the Safety Data Sheet (SDS) for site-specific handling, storage, and exposure control guidance.
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