LOCTITE AA 3974
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
- Rapid UV/Visible-Light Fixture
- Thermal-Cycling-Resistant Cured Adhesive
- Potting/Sealing/Bonding Assembly Applications
Product Description
LOCTITE® AA 3974™ is a one-component UV and visible light-curing acrylic adhesive designed for potting, sealing and bonding thermoplastics, glass and metals exposed to thermal cycling and environmental aging. The product offers rapid curing under UV or visible light, develops flexible and durable bond lines, and is suitable for disposable medical device assembly. It has been tested against ISO 10993-based biocompatibility protocols and is widely used where high-speed curing and reliable long-term performance are required.
Key Features & Benefits
- One-component UV/visible light curing acrylic adhesive.
- Rapid fixture times of approximately 5 seconds under LED systems.
- Suitable for bonding thermoplastics, glass and metals.
- Excellent resistance to thermal cycling and environmental exposure.
- Designed for potting, sealing and bonding applications.
- Suitable for disposable medical device assembly.
- Tested to ISO 10993-based biocompatibility protocols.
Recommended Applications
- Medical device assembly and disposable device manufacturing.
- Glass, thermoplastic and metal bonding.
- Potting electronic and industrial components.
- High-speed UV-curable sealing operations.
- Assemblies exposed to thermal cycling and environmental aging.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Physical Properties
Additional Information
As-Supplied / Before-Processing Properties
| Property | Value | Unit | Condition |
|---|---|---|---|
| Technology | UV Acrylic | — | UV / Visible Light Cure |
| Appearance | Translucent Colorless Liquid | — | Uncured |
| Components | One Part | — | No mixing required |
| Specific Gravity | 1.09 | — | 25°C |
| Density | 1.106 | g/cm³ | 20°C |
| Viscosity | 2,400 | mPa·s (cP) | Cone & Plate, 25°C |
| Flash Point | 81.5 | °C | Pensky-Martens Closed Cup |
| UV Fixture Time | 5 | seconds | 100 mW/cm² @ 365 or 405 nm LED |
After-Processing / Final-State Properties
| Property | Value | Unit | Condition / Method |
|---|---|---|---|
| Shore Hardness | 77 | Shore A | ISO 868 |
| Tensile Strength | 33 | N/mm² | ISO 527-3 |
| Elongation at Break | 100 | % | ISO 527-3 |
| Linear Shrinkage | 2.6 | % | ASTM D792 |
| Water Absorption | 5.8 | % | 2 h in boiling water, ISO 62 |
| Surface Resistivity | 1.25 × 10¹⁴ | Ω | IEC 60093 |
| Volume Resistivity | 1.1 × 10¹² | Ω·cm | IEC 60093 |
| Dielectric Breakdown Strength | 17 | kV/mm | IEC 60243-1 |
| Dielectric Constant / Dissipation Factor | 5.43 / 0.15 | — | 1 kHz, IEC 60250 |
| Block Shear Strength (Polycarbonate to Polycarbonate) | 13 | N/mm² | ISO 13445 |
| Needle Pullout Strength | 19 | N | Polycarbonate hub to stainless steel cannula |
| VOC Content | 9.9 | % | SDS, Section 15 |
