LOCTITE AA 331
Harmonization Code : 2901.10.00.00 | Acyclic hydrocarbons; Saturated
Main features
- Rapid Activator-Assisted Fixture
- High-Strength Metal Bonding
- Magnet Assembly Impact Resistance
Product Description
LOCTITE AA 331 is a one-component, medium-viscosity modified acrylic structural adhesive for metal bonding, including permanent-magnet and electric-motor assemblies. The adhesive is supplied separately from LOCTITE SF 7387 activator, which is required for room-temperature cure. On grit-blasted mild steel with single-side activator, fixture is 17 seconds at a 0.05 mm gap and lap shear is 13.8 N/mm^2 after 24 hours at 23 deg C. The cured adhesive develops peel, impact, and magnet-bond strength; values depend on activator placement, bondline gap, surface preparation, and cure conditions.
Key features
- Rapid activator-assisted fixture: Fixture is 17 seconds at a 0.05 mm gap on grit-blasted mild steel at 23 deg C with Activator 7387 on one side.
- Steel lap shear strength: Lap shear is 13.8 N/mm^2 after 24 hours at 23 deg C on grit-blasted mild steel with a 0.05 mm gap and Activator 7387 on one side.
- Ferrite-to-steel bond strength: Ferrite-to-mild-steel block shear is 12 N/mm^2 after 48 hours at 23 deg C with a 0.05 mm gap and Activator 7387 on both sides.
Applications
Metal-to-metal structural bonding, including DC motor/magnet bonding and precoated sheet-metal assemblies.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Physical Properties
Thermal Properties
Mechanical Properties
Chemical Properties
Other Properties
Additional Information
As-supplied / before-processing properties
The adhesive is the page entity; LOCTITE SF 7387 activator is separately supplied and required for the cited room-temperature cure process.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Appearance | Light yellow to sand yellow paste | Uncured | |
| Specific gravity | 1.08 | 23 deg C | |
| Cone and plate viscosity | 19,000 | mPa s | 25 deg C; PHYSICA MK22; 5 s^-1 |
After-processing / final-state properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Glass transition temperature | 64 | deg C | TMA; cured 48 h at 23 deg C plus 3 h at 80 deg C; tested at 23 deg C |
| Shore hardness | 86 | Durometer D | ISO 868; cured 48 h at 23 deg C plus 3 h at 80 deg C; tested at 23 deg C |
| Lap shear strength | 13.8 | N/mm^2 | ISO 4587; steel; 0.05 mm gap; Activator 7387 on one side; 24 h at 23 deg C |
| 180 deg peel strength | 3.3 | N/mm | ISO 8510-2; grit-blasted steel |
| Ferrite-to-steel block shear | 12 | N/mm^2 | ISO 13445; 0.05 mm gap; Activator 7387 on two sides; 48 h at 23 deg C |
