LOCTITE EA 9321
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
- Thixotropic Application Control
- Room-Temperature Retention Cure
- 1,000 psi Lap Shear
Product Description
LOCTITE® EA 9321 AERO is a two-component, thixotropic epoxy paste adhesive for aerospace potting, edge-fill and structural bonding applications. The gray adhesive cures at room temperature and can also be heat cured when a faster process is required. It forms tough, durable bonds and retains useful strength across a broad test-temperature range, with a defined service temperature of approximately 250°F (121°C) based on 1,000 psi (6.9 MPa) lap shear strength. Its paste consistency supports controlled application, while a 40-minute pot life at 77°F (25°C) provides time for mixing, dispensing and assembly.
Key features
- Dual-cure capability: Cures in 5–7 days at 77°F (25°C), with an alternative complete cure of 1 hour at 180°F (82°C).
- Elevated-temperature strength: Provides an approximate service temperature of 250°F (121°C), defined at 1,000 psi (6.9 MPa) lap shear strength.
- Thixotropic paste consistency: Supports controlled placement in potting, edge-fill and structural bonding applications.
Applications / Suitable for
- Aerospace potting
- Edge-fill applications
- Structural bonding
- OEM and maintenance, repair and overhaul applications
Technical Specifications
General Properties
Physical Properties
Additional Information
As-supplied / before-processing properties
Typical component and mixed-material properties. Keep Part A, Part B and mixed-material values distinct during product evaluation and processing.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Color | Part A: Gray Part B: Off white Mixed: Gray |
— | Uncured components and mixed adhesive |
| Viscosity — Part A | 2,900–7,100 | Poise | 77°F; Brookfield HBT, spindle 7 at 20 rpm |
| Viscosity — Part B | 200–800 | Poise | 77°F; Brookfield HBT, spindle 5 at 20 rpm |
| Density | Part A: 1.24 Part B: 1.22 Mixed: 1.23 |
g/ml | Uncured components and mixed adhesive |
| Mix ratio by weight | 100:50 | Parts by weight | Part A:Part B; volume measurement is not recommended for structural applications without ratio-control precautions |
| Pot life | 40 | minutes | 450 g mixed mass at 77°F (25°C); ASTM D2471, water bath |
| Shelf life at ≤77°F (25°C) | Part A: 3 months Part B: 1 year |
— | Store in the intended conditions after receipt |
After-processing / final-state properties
Typical cured-material and bonded-joint properties. Values depend on the stated cure, specimen, substrate, preparation and test conditions.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Tensile lap shear strength | 4,000 | psi | ASTM D1002 at 77°F (25°C); 2024-T3 AlClad aluminum, FPL etched; 7 days at 77°F (25°C) or 1 hour at 180°F (82°C) |
| Service temperature | Approximately 250 | °F | 121°C; defined where ASTM D1002 lap shear strength remains 1,000 psi (6.9 MPa) |
| Tensile strength | 7,100 | psi | ASTM D638; 0.125 in (3.18 mm) casting at 77°F (25°C) |
| Tensile modulus | 420 | ksi | ASTM D638; 0.125 in (3.18 mm) casting at 77°F (25°C) |
| Elongation at break | 6 | % | ASTM D638; 0.125 in (3.18 mm) casting at 77°F (25°C) |
| Hardness | 84 | Shore D | Cured bulk resin at 77°F (25°C) |
| Glass-transition temperature | Dry: 230 Wet: 190 |
°F | Dry: 110°C; wet: 88°C |
| Compressive strength | Yield: 9,280 Ultimate: 16,880 |
psi | ASTM D695; 0.5 in (12.7 mm) casting at 77°F (25°C) |
