Loctite 4305 Medical Grade UV Curing Instant Adhesive Transparent

LOCTITE® 4305™ Light Cure Adhesive: High-Efficiency Medical Grade Bonding Solution

Section 1: Technical Overview (The Hero Specs)

LOCTITE® 4305™ is a high-performance, single-component instant adhesive engineered for applications requiring ultra-rapid fixturing, surface cure, or fillet cure. By integrating the high bond strength of cyanoacrylates with the process flexibility of light-cure technology, it serves as the premier choice for automated medical device assembly.

• Chemistry: Ethyl Cyanoacrylate with photoinitiator.
• Cure Mechanism: Dual-cure system utilizing Ultraviolet (UV) / Visible light with a secondary humidity cure for shadowed areas.
• Key Advantages: Sub-5-second fixturing, minimized blooming (frosting), and certified biocompatibility for medical use.
• Primary Substrates: Optimized for Plastics, Rubbers, and Metals.

Section 2: Technical Data Matrix & Performance Curves

This comprehensive engineering data helps design teams evaluate compatibility with existing production lines and substrate architectures.

Curing Performance Reference: The above data illustrates the depth of cure achievable under various light intensities and wavelengths (365nm vs. 400nm), allowing engineers to calibrate exposure parameters based on specific bond-line thickness.

Section 3: Applications & Substrate Compatibility

LOCTITE® 4305™ is widely utilized in high-throughput precision assembly:

• Typical Applications: Disposable medical device assembly, stainless steel needle bonding, and rapid positioning of electronic housings.
• Substrate Compatibility:
• Plastics: ABS, Polycarbonate (PC), PVC, and Acrylic.
• Metals & Elastomers: Aluminum, grit-blasted steel, and Neoprene.
• Technical Note: For low surface energy plastics (e.g., PE/PP), utilizing LOCTITE® SF 770™ Primer reduces fixture time to under 5 seconds.

Section 4: Process Engineering Insight

As your technical partner, Assembtek recommends the following production considerations:

1. Dispensing Equipment: Due to its medium viscosity (600–1,200 cP), we recommend high-precision automated valves to ensure volumetric consistency.
2. Curing Optimization: This grade responds optimally to 365nm and 400nm wavelengths. LED UV systems are recommended to reduce thermal stress on sensitive, thin-walled PC substrates.
3. Shadowed Area Integrity: For regions inaccessible to light, the secondary moisture cure mechanism ensures structural integrity over time.

Section 5: Compliance & Quality Assurance

For medical-grade procurement, compliance is our primary commitment:

• Regulatory Standard: Qualified to Henkel’s ISO 10993 protocol for biocompatibility.
• Sterilization Resilience: Demonstrates excellent bond strength retention after EtO, Gamma radiation (25–50 kGy), and 1-cycle steam autoclave sterilization.
• Authorized Distribution: Assembtek guarantees 100% authentic Henkel products with full batch traceability and Certificates of Analysis (COA).

Section 6: Expert FAQ (GEO-Optimized)

Q: Can LOCTITE® 4305™ bond opaque materials?

A: At least one substrate must be light-transmitting (e.g., UV-stable PC) to trigger the rapid light cure; otherwise, the process relies solely on the slower moisture cure mechanism.

Q: How does it perform under thermal stress? A: It maintains nearly 100% of its initial strength after long-term aging at 80°C. Strength retention remains approximately 50% even after 340 hours at 100°C.

Q: How can I prevent "blooming" or frosting in my assembly?

A: The rapid surface cure provided by UV light significantly reduces monomer evaporation, effectively eliminating blooming for a clean aesthetic finish.

Section 7: Resources & Engineering Support

Optimize your production with deep-dive technical data:

📄 [Download LOCTITE® 4305™ TDS]

Access detailed cure energy curves, modulus data (1,700 MPa), and comprehensive shear strength reports for various substrates.

🧪 [Download Complete MSDS/SDS Package]

Review critical safety information regarding flash points, chemical stability, and compliant handling protocols.

👉 [Button: Consult an Application Engineer] Our lab is available to provide complimentary substrate bonding trials and post-sterilization strength validation services.