Loctite SF 770 Primer 1.75oz

LOCTITE® SF 770 Primer is a very low viscosity clear surface primer engineered for maximum efficacy in preparing low surface energy substrates. This industrial-grade primer permanently modifies surfaces to improve adhesion, preventing costly bonding failures caused by difficult-to-bond plastics. Whether you are securing precise components or structural assemblies, this premium CA surface primer provides a robust, reliable foundation on all materials—including specific difficult materials like polyethylene, polypropylene, polytetrafluoroethylene (PTFE), and thermoplastic rubber materials.

Why Choose LOCTITE SF 770 Polyolefin Primer?

• Improves Adhesion: Significantly enhances the bonding strength of LOCTITE® instant cyanoacrylate adhesives on low-energy plastics.
• Substrate Versatility: Specially formulated for difficult-to-bond materials like polyethylene, polypropylene, and PTFE.
• Fast Component Fixturing: Acts as an activator that accelerates cure speed, reducing fixturing time to less than 5 seconds on most primed substrates.
• Fluorescent Detection: Contains a UV indicator that allows the presence of the primer to be easily detected under a 365 nm UV inspection lamp.
• Convenient Handling: Designed for straightforward application by spraying, brushing, or dipping at ambient temperatures.

Technical Specifications

• Product Type: Cyanoacrylate (CA) Surface Primer
• Strength: Not Applicable (Surface Primer)
• Color: Clear / Ultra Clear
• Container Size: 52ml
• Certifications: Loctite Material Specification (LMS)

Simple Application Instructions

• Clean: For optimal results, clean all internal and external surfaces to remove contaminants and let dry.
• Apply: Apply the primer to the difficult-to-bond polyolefin substrate by spraying, brushing, or dipping at ambient temperature. Avoid applying excess primer.
• Assemble: Apply the LOCTITE® cyanoacrylate adhesive and assemble the parts immediately. While fixturing occurs in seconds, allow 24 hours at room temperature (22°C) for the adhesive to develop maximum bond strength.

Frequently Asked Questions (FAQ)

What is LOCTITE SF 770 used for?

LOCTITE SF 770 is a surface primer designed for making polyolefin and other low-energy surfaces suitable for bonding with LOCTITE® instant adhesives. It is specifically formulated to prevent instant glues from failing on inherently slick plastic parts due to low surface tension.

Can LOCTITE SF 770 be disassembled?

Disassembly depends entirely on the specific LOCTITE® cyanoacrylate adhesive used after priming. The primer itself modifies the plastic surface properties permanently to allow the adhesive to bond; refer to the respective adhesive's data sheet for removal and heat-resistance instructions.

Does LOCTITE SF 770 work on all plastics?

It is specifically recommended for difficult-to-bond substrates including polyethylene, polypropylene, polytetrafluoroethylene (PTFE), and thermoplastic rubber. It is not necessary for standard, easily bonded plastics, and it is not recommended in assemblies where high peel strength is required.

Is LOCTITE SF 770 safe for all environments?

This product must be handled in a manner applicable to highly flammable materials. It is not recommended for use in pure oxygen or oxygen-rich systems, and should not be selected as a sealant for chlorine or other strong oxidizing materials. Always check surface compatibility before use, as the solvent can affect certain plastics or coatings.