LOCTITE® 4311

LOCTITE® 4311 UV Light-Cure Adhesive – Medium Viscosity, Dual Cure, ISO-10993 Medical Grade

Unlock rapid bonding performance — perfectly engineered for plastics, rubbers, and metals.

🔹 Key Features & Benefits

• Dual-Cure Chemistry – Combines UV/visible light activation with humidity cure for fast, tack-free surface cure and secure fillet bonding with minimal blooming .

• UV Fluorescent Bondline – Bright yellow-green to dark blue-green fluorescence enables easy automated UV quality inspection in high-volume production lines .

• Medium-Viscosity Toughened Formula – Ethyl cyanoacrylate with rubber-modified formulation delivers enhanced shear strength (≥22 MPa on PC–PC) and impact resistance.

• Biocompatible & Sterilization-Resistant – ISO‑10993 compliant for disposable medical device assembly; withstands gamma, ETO, intermittent autoclave sterilization with excellent retention (≥76 %) 

• Broad Substrate Compatibility – Bonds rigid and opaque materials including plastics (ABS, polycarbonate, PVC), rubbers (neoprene), metals (aluminum, grit-blasted steel), paper, and ceramics 

⚙️ Technical Highlights

• Viscosity: 600–1,500 cP (Physica MC100) 

• Tensile Strength: ~50 MPa (7,250 psi); Shear Strength: ≥22 MPa on PC–PC 

• Shore Hardness: D 84; Elongation at Break: ~5 % 

• Thermal Range: −65 °F to +350 °F (−54 °C to +177 °C); Glass transition (Tg): ~102 °C

• Gap Filling: Up to ~0.2 mm (0.008″); tack-free in ≤10 s under UV 

✅ Ideal Applications

• Rapid Fixturing & Surface Bonding – Light-activated cure secures parts in seconds, reducing assembly cycle times.

• Fillet Joints & Gap-Filling – Medium viscosity suits close-fit and slight gap requirements.

• Medical Device Manufacturing – ISO‑10993 certified and sterilization-resistant – perfect for syringes, catheters, housings.

• Electronics & OEM Assembly – Clear, no-bloom cure preserves aesthetics; UV fluorescence ensures traceability.

💡 Best Practices & Storage

• Store refrigerated (2–8 °C) in sealed containers; minimize light exposure 

• Clean surfaces thoroughly before application; remove excess with nitromethane, acetone, or Loctite solvents.

• Use UV or high-intensity visible light (365–405 nm, 30–100 mW/cm²) to achieve <10 s surface cure