LOCTITE AA 3971
Harmonization Code : 3919.10.80 | Other self-adhesive plastic rolls not exceeding 20 cm wide.
Main features
- Post-Assembly Needle-Well Dispensing
- Dual-Wavelength Five-Second Fixture
- Black-Light Assembly Inspection
Product Description
LOCTITE AA 3971 is a one-part, low-viscosity UV/visible-light-curing acrylic adhesive developed for cannula, hub, syringe, lancet, and needle-device assembly. Its 315 mPa s viscosity at 25 deg C is suited to dispensing into the hub well after the cannula and hub are assembled. On glass, fixture is achieved in 5 seconds with 365 nm or 405 nm LED light at 100 mW/cm^2. The adhesive fluoresces under black light to support bondline-presence inspection. Typical cured tensile strength is 26 N/mm^2 after 30 seconds per side at 100 mW/cm^2 and 365 nm using an electrodeless D bulb. Typical polycarbonate block shear is 22 N/mm^2 after 30 seconds at 100 mW/cm^2 and 365 nm. Final performance depends on cure dose, substrate, and joint geometry.
Key features
- Post-assembly well dispensing: Low viscosity supports dispensing into the well after cannula and hub assembly.
- Dual-wavelength fast fixture: Fixture is 5 seconds on glass at 100 mW/cm^2 measured at either 365 nm or 405 nm.
- Black-light assembly inspection: Black-light fluorescence facilitates inspection of bonded assemblies for adhesive presence.
Applications
Bonding cannulae into hubs and assembling syringes, lancets and needle devices.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Physical Properties
Other Properties
Additional Information
As-supplied / before-processing properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Appearance | Transparent liquid | Uncured | |
| UV fluorescence | Positive | Under UV light | |
| Specific gravity | 1.05 | 25 deg C | |
| Brookfield viscosity | 315 | mPa s (cP) | 25 deg C; RVT; spindle 2; 20 rpm |
After-processing / final-state properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Shore hardness | 66 | Durometer D | ISO 868; 100 mW/cm^2 at 365 nm for 30 s per side; D bulb |
| Elongation at break | 93 | % | ISO 527-3; 100 mW/cm^2 at 365 nm for 30 s per side; D bulb |
| Tensile strength | 26 | N/mm^2 | ISO 527-3; 100 mW/cm^2 at 365 nm for 30 s per side; D bulb |
| 22 gauge cannula pullout | 192 | N | Acrylic hub; 1,000 mW/cm^2 at 365 nm for 10 s; D bulb |
| Polycarbonate block shear | 22 | N/mm^2 | ISO 13445; polycarbonate-to-polycarbonate; 100 mW/cm^2 at 365 nm for 30 s |
