Item Name: LOCTITE® AA 3321™
Manufacturer: Henkel
Technologies: Acrylated urethane, UV/visible light cure
Color: Transparent liquid
Cure Type: Ultraviolet (UV) / Visible light
Package Size: Contact to Techniq VN for details.
Shelf Life: Contact to Techniq VN for detail
LOCTITE® AA 3321™ is a one-component, medium-viscosity, UV/visible light-curing acrylic adhesive based on acrylated urethane technology. It cures rapidly under light exposure, offering flexible bonds that absorb shock and distribute load effectively. Designed mainly for bonding PVC to polycarbonate, it demonstrates strong adhesion to plastics, metals, and glass. Its thixotropic nature minimizes product migration after application. The product complies with Henkel’s ISO 10993 protocol, supporting its use in medical devices.
Bonding rigid or flexible PVC to polycarbonate, particularly where gap filling and flexible joints are needed.
General adhesion to a wide range of plastics, metals, and glass.
Suitable for medical devices due to ISO 10993 compliance.
High-speed UV/visible light curing supports efficient production.
| Property | Uncured | Cured |
|---|---|---|
| Appearance | Transparent liquid | Solid, Shore D 53 |
| Specific Gravity @ 25°C | 1.08 | — |
| Viscosity (25°C, spindle 4, 20 rpm) | 3,500–7,500 mPa·s | — |
| Refractive Index | 1.48 | 1.50 |
| Cure Method | UV/Visible light | UV/Visible light, depth >13 mm achievable |
| Fixture Time | Glass ≤15 s (6 mW/cm², 365 nm) | Polycarbonate-PVC <5 s (30–50 mW/cm², 365 nm) |
| Tensile Strength | — | 18.6 N/mm² (2,700 psi) |
| Elongation at Break | — | 250% |
| Tensile Modulus | — | 255 N/mm² (37,000 psi) |
| Lap Shear (Polycarbonate, 0.5 mm gap) | — | 5.2 N/mm² (substrate failure) |
| Electrical Resistivity | — | Volume: 7.7×10¹⁴ Ω·cm; Surface: 9.2×10¹⁴ Ω·cm |
| Dielectric Strength | — | 26 kV/mm |
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