EPIBOND 420
Harmonization Code : 3506.91.90.99 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other
Main features
- Structural Applications Epoxy Bonding
- Room-Temperature Adhesive Cure
- Extremely Tough and Resilient
Product Description
Huntsman EPIBOND® 420 A/B Structural Epoxy Adhesive is a two-component, modified epoxy adhesive designed for structural bonding applications requiring high strength, toughness, and resilience. This room-temperature curing paste is suitable for bonding metals, honeycomb structures, and fiber-reinforced composites in demanding assemblies. The adhesive incorporates 5 mil (125 μm) spacer beads to help maintain a consistent bond line in high-stress joints. EPIBOND® 420 A/B offers a practical combination of room-temperature processing flexibility and accelerated heat-cure options, making it suitable for a range of aerospace, industrial, and composite bonding applications.
Key features
- Structural epoxy formulation: Developed for high-strength bonding of metals, honeycomb materials, and fiber-reinforced composite substrates.
- Controlled bond-line thickness: Contains 125 μm spacer beads to help maintain a uniform adhesive bond line in high-stress assemblies.
- Flexible curing options: Supports room-temperature cure or accelerated thermal cure schedules to accommodate different manufacturing requirements.
Applications / Suitable for
- Metal-to-metal structural bonding
- Honeycomb panel assembly
- Fiber-reinforced composite bonding
- Aerospace structural assemblies
- Industrial structural adhesive applications
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Additional Information
As-supplied / before-processing properties
Typical as-supplied properties for the EPIBOND® 420 A/B adhesive system.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Mix ratio | 100 : 40 | wt. ratio | 420 A Resin : 420 B Hardener |
| Density | 1.05 | g/cm³ | ASTM D792, mixed system |
| Appearance | Blue-green | — | Mixed adhesive system |
| Work life | 70 | minutes | 77°F (25°C), ASTM D1338 |
| Viscosity | Semi-paste | — | 77°F (25°C), ASTM D2196 |
| Shelf life | 1 | year | Stored at +2°C to +40°C in sealed container |
After-processing / final-state properties
Typical cured properties after one hour at 250°F (121°C). Values are typical data and not specifications.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Lap shear strength | 3500 (24.1) | psi (MPa) | Al-Al, ASTM D1002, 77°F (25°C) |
| Insert shear strength | 1500 (10.3) | psi (MPa) | As cured, BMS 5-107 |
| Insert shear strength retention | 1400 (9.6) | psi (MPa) | After 30 days at 140°F (60°C), 95% RH, BMS 5-107 |
