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LOCTITE® SF 770 – Primer for cyanoacrylate adhesives to bond polyolefins and other low-energy plastics

  • Item Name: LOCTITE® SF 770
  • Manufacturer: Henkel
  • Product Category: Primer for cyanoacrylate adhesives
  • Technologies: Aliphatic amine-based surface primer
  • Applications: Enhances bonding of cyanoacrylate adhesives to polyolefins and low-energy surfaces
  • Color: Transparent to slightly hazy
  • Cure Type: Not applicable (primer)
  • Package Size: Contact Techniq VN for details
  • Shelf Life: Contact Techniq VN for details

1. Product Overview

LOCTITE® SF 770 is a surface primer designed to enhance the adhesion of cyanoacrylate adhesives on low-energy surfaces such as polyethylene, polypropylene, PTFE, and thermoplastic rubber. It is a transparent to slightly hazy liquid with very low viscosity and contains isopropyl acetate as a solvent. The primer improves bonding performance but is not recommended for applications requiring high peel strength.

2. Applications

  • Priming low-energy surfaces for bonding with cyanoacrylate adhesives
  • Suitable for materials such as polyethylene, polypropylene, PTFE, and thermoplastic rubber
  • Used in industries where bonding of difficult substrates is required
  • Applied via spraying, brushing, or dipping

3. Typical Properties

Unmixed State

Property Value
Specific Gravity @ 23°C 0.87
Viscosity @ 25°C (cP) 0.62
Drying Time @ 23°C (sec) – Steel 9
Drying Time @ 23°C (sec) – Polypropylene 9
Drying Time @ 23°C (sec) – Polyethylene 8
On-Part Life (hours) 8

Adhesive Properties (Block Shear Strength, ISO 13445)

Substrate Adhesive Strength (N/mm²) Strength (psi)
Polypropylene LOCTITE® 406 15 2,200
Polypropylene LOCTITE® 496 4.8 700
Polypropylene LOCTITE® 460 14 2,100
Acetal LOCTITE® 406 14 2,000
HDPE (treated) to Mild Steel (grit blasted) LOCTITE® 406 15 2,200
Polypropylene (treated) to Polypropylene LOCTITE® 406 13 1,900

Environmental Resistance (Polypropylene to Polypropylene with LOCTITE® 401)

  • Hot Strength: Maintains bond strength up to 80°C
  • Heat Aging: Maintains over 80% of initial strength after 1,000 hours at 60°C and 80°C
  • Chemical Resistance: Maintains 100% strength after exposure to water (23°C) and 95% RH (40°C) for up to 1,000 hours

BERGQUIST microTIM mTIM 1028 Thermal Interface Coating High performance thermal management solution for nickel finished heat sinks, optical transceivers, and data center liquid cooling systems

BERGQUIST microTIM mTIM 1028 is purpose built for riding cage assemblies in servers, switches, and routers, interfacing with electroless nickel plated copper or aluminum heat sinks. It ensures stable operation in high power transceiver modules while also extending applicability to liquid cooling components, heat pipes, and fin based dissipative structures.

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