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LOCTITE® SF 770

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

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Techniq Vietnam provides end-to-end materials and process solutions, integrating world-class technologies in adhesives, soldering, and thermal management.

Through partnerships with leading global brands, we deliver high-value materials, expert consulting, and optimized supply chains ensuring timely delivery, efficiency, and sustainable growth for our clients.

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