Loctite 431 Instant Adhesive 20g

Loctite 431 Instant Adhesive 20g is a medium viscosity, ultra-clear instant adhesive engineered for maximum efficacy in high-performance bonding. This industrial-grade adhesive permanently bonds parts together, preventing costly assembly failures caused by high tension, uniform stress, or severe shear forces. Whether you are securing small-to-medium parts or handling general assembly tasks, this premium ethyl-based instant adhesive provides a robust, leak-proof seal on all materials—including difficult-to-bond, porous, and acidic substrates.

Why Choose Loctite 431 Rapid Bond Strength?

• Rapid Fixture Time: Achieves a functional fixture in just 5 to 10 seconds, leaving little opportunity for misaligned adjustments.
• Versatile Material Compatibility: Excellent adhesion across metals, rubbers, plastics, and elastomers.
• Porous Surface Excellence: Specially formulated to excel on difficult materials like wood, paper, leather, and fabric.
• Polyolefin Capabilities: Perfect for challenging polyolefin plastics when paired with Primer LOCTITE SF 770 or LOCTITE SF 7239.
• Solvent-Free & Moisture Cured: An eco-conscious, solvent-free formulation that initiates curing naturally via atmospheric humidity.

Technical Specifications

• Product Type: Ethyl-based Instant Adhesive (Cyanoacrylate)
• Strength: High (2300 psi Shear Strength on Grit Blasted Steel)
• Color: Ultra Clear / Transparent
• Container Size: 20g
• Certifications: Qualified to Henkel's ISO 10993 Protocol for the medical device industry

Simple Application Instructions

1. Clean: For optimal results, clean all bond areas with a Loctite cleaning solvent to ensure they are clean and free from grease, then allow to dry.
2. Apply: Apply a small amount of the liquid adhesive to one of the bond surfaces. Do not use items like tissue or a brush to spread the adhesive. (Optional: Apply Loctite Primer or Activator to speed up cure times or bond polyolefins).
3. Assemble: Assemble the parts within a few seconds and hold fixed or clamped. The formula will begin curing very quickly once confined between the two surfaces. Allow 24 to 72 hours for full chemical resistance to develop.

Frequently Asked Questions (FAQ)

What is Loctite 431 used for?

Loctite 431 is a general-purpose instant adhesive designed for the rapid assembly of small to medium-sized parts. It is specifically formulated to prevent component displacement or separation due to heavy operational tension and shear strength demands.

Can Loctite 431 be disassembled?

No, not easily with standard hand tools. Because it forms an incredibly rigid and permanent cyanoacrylate bond, disassembly typically requires specialized chemical de-bonders, intense mechanical force, or high heat exceeding its operational thresholds to break the polymer matrix.

Does Loctite 431 work on porous materials?

Yes. Unlike standard super glues that get rapidly absorbed by rough surfaces, Loctite 431 features a medium viscosity (900 mPa.s) that makes it highly effective on porous and acidic surfaces like wood, paper, leather, and fabric.

Is Loctite 431 safe for medical device environments?

Loctite 431 has been qualified to Henkel's ISO 10993 Test Protocol. This means it is certified as an eligible product choice to assist in the selection and manufacturing of equipment within the medical device industry (subject to regional approvals).