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Fast-reacting aliphatic amine-based curing agent for room-temperature and elevated-temperature epoxy systems.
Low viscosity (200–300 mPa·s at 25°C) enabling excellent mixing efficiency and improved filler dispersion.
Low volatility and reduced amine odor, enhancing workplace safety and operator comfort during handling.
Excellent chemical resistance post-cure—particularly to alkalis, solvents, and mild acids.
Provides high glass transition temperature (Tg > 85°C) and superior mechanical strength in cured epoxy networks.
Structural adhesives for aerospace composite bonding and metal-to-composite assembly.
High-performance protective coatings for offshore platforms, chemical processing equipment, and concrete substrates.
Electrical encapsulation and potting compounds requiring rapid throughput and thermal stability.
Wind turbine blade bonding and repair formulations demanding low exotherm and extended working life.
Tooling and mold-making resins where dimensional stability and surface hardness are critical.
| Chemical Type | Aliphatic polyamine adduct |
| Product Form | Liquid |
| Appearance | Pale yellow to amber clear liquid |
| Density (25°C) | 0.92–0.95 g/cm³ |
| Viscosity (25°C) | 200–300 mPa·s |
| Amine Value | 380–420 mg KOH/g |
| Reactivity with DGEBA Epoxy | Full cure achievable in 24 h at 25°C or 4 h at 80°C |
| Primary Applications | Epoxy adhesives, coatings, composites, encapsulants |
Q1: What is the primary chemical functionality of HDX-50EA Curing Agent?
A: HDX-50EA is an epoxy-reactive amine-based curing agent designed to provide balanced reactivity and extended pot life in thermosetting resin systems. Its molecular structure features sterically hindered aliphatic amine groups, contributing to improved moisture tolerance and reduced volatility compared to conventional amines.
Q2: How does HDX-50EA perform in high-humidity or ambient-cure applications?
A: HDX-50EA exhibits enhanced resistance to humidity-induced surface defects such as blushing or amine bloom, making it well-suited for ambient-cure coatings and adhesives applied in non-climate-controlled environments. Its reactivity profile allows for reliable film formation even at moderate relative humidity levels.
Q3: Is HDX-50EA compatible with standard epoxy resins used in industrial coatings and composites?
A: Yes — HDX-50EA is broadly compatible with common liquid and solid bisphenol-A and bisphenol-F epoxy resins, as well as novolac epoxies. It delivers good crosslink density and mechanical performance without requiring specialized resin modifications.
Q4: What are typical handling and storage recommendations for HDX-50EA?
A: HDX-50EA should be stored in tightly sealed containers under dry, cool conditions (below 30°C) and protected from moisture and strong oxidizing agents. Prolonged exposure to air may lead to surface skinning due to reaction with atmospheric CO₂; therefore, nitrogen blanketing is recommended for long-term bulk storage.
Q5: How does the cure speed of HDX-50EA compare to conventional aliphatic amines?
A: HDX-50EA offers a moderated reactivity—faster than latent or dicyandiamide-type hardeners but slower than highly reactive unmodified aliphatic amines. This provides a practical working window for mixing and application while still achieving full cure at ambient or mildly elevated temperatures.
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