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High reactivity with epoxy resins, enabling rapid cure at ambient or moderate elevated temperatures.
Excellent chemical resistance and thermal stability in cured epoxy systems.
Low viscosity and good solubility in common epoxy diluents and solvents.
Consistent 85% active amine content ensures predictable stoichiometric formulation.
Low volatility and reduced odor profile compared to conventional aliphatic amines.
Structural adhesives for aerospace and automotive composites.
High-performance protective coatings for industrial steel and concrete.
Electrical encapsulation and potting compounds requiring low dielectric loss.
Wind turbine blade bonding and repair formulations.
Advanced composite tooling matrices demanding dimensional stability.
| Chemical Type | Aliphatic diamine (1,6-hexanediamine derivative) |
| Product Form | Liquid |
| Appearance | Clear, pale yellow liquid |
| Amine Value | 430–450 mg KOH/g |
| Active Amine Content | ~85 wt% |
| Density (20°C) | 0.92–0.94 g/cm³ |
| Viscosity (25°C) | 20–40 mPa·s |
| Flash Point (COC) | ≥110°C |
Q1: What is the primary function of RHODIAMINE HMD 85% in epoxy systems?
A: RHODIAMINE HMD 85% serves as a highly reactive aliphatic amine curing agent, enabling rapid crosslinking of epoxy resins at ambient or slightly elevated temperatures. It delivers excellent mechanical properties, chemical resistance, and low viscosity for improved formulation handling.
Q2: Is RHODIAMINE HMD 85% suitable for applications requiring low volatility and reduced odor?
A: Yes — as a high-molecular-weight, partially modified diamine, RHODIAMINE HMD 85% exhibits significantly lower vapor pressure and milder odor compared to conventional low-molecular-weight aliphatic amines, supporting safer handling and improved workplace compatibility.
Q3: How does the 85% active content affect formulation design?
A: The 85% concentration indicates the presence of ~15% inert diluent (typically a low-viscosity reactive or non-reactive carrier), which helps moderate reactivity, improve mixability with resins, and reduce exotherm — offering greater processing flexibility without compromising final network performance.
Q4: Can RHODIAMINE HMD 85% be used in moisture-sensitive applications?
A: While it offers better moisture tolerance than many standard aliphatic amines due to its steric hindrance and reduced primary amine content, RHODIAMINE HMD 85% remains susceptible to humidity-induced surface defects (e.g., blush or haze) under high ambient moisture. Optimal results are achieved under controlled conditions or with appropriate formulation adjustments.
Q5: What types of epoxy resins is RHODIAMINE HMD 85% typically compatible with?
A: It demonstrates broad compatibility with standard liquid and solid bisphenol-A/F epoxy resins, novolacs, and cycloaliphatic epoxies. Compatibility and cure profile should be verified experimentally, especially with highly functional or sterically hindered resins.
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