Loctite 420 Instant Adhesive 20gm

Loctite 420 Instant Adhesive 20gm is a general purpose transparent, colorless to straw colored cyanoacrylate instant adhesive engineered for maximum efficacy in high-performance bonding. This industrial-grade adhesive permanently bonds substrates in close-fitting parts, preventing costly component failures caused by operational stress or joint movement. Whether you are securing intricate assemblies or quick-fix production pieces, this premium ethyl cyanoacrylate adhesive provides a robust, rapid seal on all key substrates—including plastics, rubbers, and metals.

Why Choose Loctite 420 Fast-Curing & Ultra-Low Viscosity?

• Ultra-Low Viscosity: *The liquid features a very low wicking viscosity (1 to 5 cP), allowing it to easily penetrate pre-assembled joints through capillary action.*
• Broad Material Versatility: *Offers excellent fixture and bond performance across diverse materials including metals, ABS, PVC, Polycarbonate, Phenolic, Neoprene, and Nitrile rubber.*
• Exceptional Fluid & Solvent Resistance: *Maintains 100% of its initial strength after 1,000 hours of exposure to harsh environments like gasoline, motor oil, ethanol, isopropanol, and freon.*
• Rapid Fixture Times: *Achieves robust fixture strengths within less than 5 seconds on rubbers and 3 to 60 seconds on plastics and metals under normal atmospheric humidity.*
• Reliable Thermal & Environmental Stability: *Effectively handles harsh heat/humidity environments and exhibits a high softening point of 165°C.*

Technical Specifications

• Product Type: Cyanoacrylate Instant Adhesive
• Strength: High (Tensile Shear Strength up to 26 N/mm² on grit-blasted steel)
• Color: Transparent, colorless to straw colored
• Container Size: 20gm
• Certifications: Tested to Military Specification Mil-A-46050C and qualified to Commercial Item Description A-A-3097

Simple Application Instructions

1. Clean: For best performance, bond surfaces should be thoroughly clean and completely free from grease or oil residue.
2. Apply: Apply a thin layer of the liquid adhesive. This product performs best in thin bond gaps around 0.05 mm. If gaps are unacceptably large, a compatible Loctite activator can be pre-applied to the surface to improve cure speeds.
3. Assemble: Assemble and tightly hold the parts for a few seconds. Atmospheric moisture immediately initiates the curing process, and full chemical/solvent resistance will finish developing over the next 24 hours. Excess uncured adhesive can be dissolved using Loctite cleanup solvents, nitromethane, or acetone.

Frequently Asked Questions (FAQ)

What is Loctite 420 used for?

Loctite 420 is a general purpose cyanoacrylate instant adhesive designed for the permanent bonding of components. It is specifically formulated with an ultra-low viscosity to wick into tightly fitting parts and prevent assemblies from shifting or breaking under stress.

Can Loctite 420 be disassembled?

No, cyanoacrylate bonds create a highly rigid, permanent structural hold. To dissolve misapplied or excess cured adhesive, you must chemically treat the bond line using nitromethane, acetone, or dedicated Loctite cleanup solvents.

Does Loctite 420 work on Plastics, Rubbers, and Metals?

Yes. Loctite 420 offers robust performance across an array of materials. It is highly effective on plastics (such as ABS, PVC, and Polycarbonate), rubbers (like Neoprene and Nitrile), as well as metallic substrates (such as steel, aluminum, and zinc dichromate).

Is Loctite 420 safe for oxygen or oxidizing environments?

No. This product is strictly not recommended for use in pure oxygen and/or oxygen-rich systems, and it must not be selected as a sealant for chlorine or other strong oxidizing materials. For complete safe handling information, always consult the product's Material Safety Data Sheet (MSDS).