Loctite SF 7240 is a blue-green liquid activator designed to promote and accelerate the curing of Loctite anaerobic adhesives and sealants without any significant loss of joint strength. When working with passive metals, inert surfaces, large bond gaps, or at low temperatures below 15°C, Loctite SF 7240 activator is the professional solution to ensure reliable and fast anaerobic cure.

This single-component, basic copper salt activator in a reactive methacrylate monomer solvent brushes easily onto mating surfaces and remains active for up to 6 hours after application – providing a practical working window for production line and maintenance environments. Loctite SF 7240 is especially recommended for use with Loctite 638 retaining compound and is compatible with the full range of Loctite anaerobic products.

Key Features & Benefits

Accelerates cure on passive metals, inert surfaces, and large bond gaps
No significant strength loss – full joint integrity maintained with correct use
Essential for low-temperature applications (particularly below 15°C)
Remains active for up to 6 hours after application – flexible production window
Easy brush application – apply to one surface only in most cases
Blue-green colour – easy to identify treated surfaces
Low viscosity (10–20 mPa·s) for fast, even spreading
Compatible with all Loctite anaerobic adhesives and sealants
For large gaps (>0.4 mm) or maximum cure speed: treat both mating surfaces
Do not mix activator and adhesive directly as liquids – apply to separate surfaces

Common Applications

Loctite SF 7240 anaerobic activator is used when:

Bonding passive metals such as stainless steel, zinc, aluminium, or plated surfaces
Working at low ambient temperatures (below 15°C)
Dealing with large bond gaps (>0.4 mm clearance)
Accelerating cure speed for high-volume production environments
Using any Loctite anaerobic threadlocker, retaining compound, or pipe sealant on difficult substrates
Achieving faster handling strength in maintenance and repair applications

How to Use Loctite SF 7240

Surfaces may be bonded "as received" but cleaning is recommended for maximum strength.
Brush Loctite SF 7240 activator onto one mating surface to be bonded.
Apply the Loctite anaerobic adhesive to the other surface.
For large gaps (>0.4 mm) or maximum speed, treat both surfaces.
Complete bond assembly within 6 hours of activator application.
Once adhesive is applied to an activated surface, complete assembly within 15 seconds.
Secure assembly and await fixturing before any further handling.

⚠️ Important: Under no circumstances should activator and adhesive be mixed directly as liquids.

Buy Loctite SF 7240 activator at Tapemart – always in stock, fast delivery, India's trusted Loctite distributor.

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