Loctite® 3090 Two-Component Cyanoacrylate Adhesive

Loctite 3090 two-component cyanoacrylate adhesive: instant bonding without a perfect joint

Traditional cyanoacrylate adhesives have a clear limitation: they require perfectly fitted surfaces. As soon as there is a gap, they fail.

Loctite 3090 breaks this constraint. Its two-component system, adhesive and activator mixed upon application, allows for bonding porous or irregular surfaces, or those with gaps up to 5 mm.

Result: setting in 10 to 60 seconds, without complex preparation, on plastic, metal, rubber, or wood.

At Dagobert Industrie, we offer the 3090 for all assemblies where a perfect joint is not an option.

What is a two-component cyanoacrylate adhesive?

A classic cyanoacrylate adhesive polymerizes upon contact with ambient humidity. Convenient, but limited: it requires a tight joint and close-fitting surfaces.

Loctite 3090 goes further. It is a two-component system: a cyanoacrylate adhesive combined with an integrated activator. The two components mix at the moment of application, which triggers accelerated and controlled polymerization.

Result: the adhesive sets even on poorly fitted or porous surfaces, or those with gaps up to 5 mm. No more perfect assembly constraints.

Principle of the two-component system: adhesive + activator

Loctite 3090 comes in a dual-cartridge format. Each component is isolated in its own chamber.

Upon application, the static mixer combines the adhesive and the activator in the correct proportions. No manual preparation, no risk of incorrect dosing.

This principle differs from two-step systems (adhesive + activator applied separately, like Loctite 770):

• Fewer handling steps
• Homogeneous mixing guaranteed with every application
• Time savings on production lines or in the workshop

The two-component system is particularly well-suited for rapid structural assemblies on porous materials, rubber, plastic, or metal.

Technical characteristics of Loctite 3090

Loctite 3090 is a two-component cyanoacrylate adhesive: an instant adhesive and an activator integrated into the same applicator. Mixing happens automatically upon application.

Its great strength: it fills gaps up to 5 mm. This is where traditional cyanoacrylates fail.

Mechanical properties and resistance

Here are the key technical data:

• Tensile strength: up to 15 N/mm²
• Shear strength: up to 13 N/mm²
• Service temperature: -55 °C to +80 °C
• Fixture time: 10 to 30 seconds depending on the substrate
• Handling time: 15 to 60 seconds
• Solvent resistance: good resistance to oils and fuels

The high viscosity of the 3090 (thixotropic gel) prevents dripping on vertical surfaces. Ideal for on-site repairs.

Product	Type	Gap filling	Tensile strength	Typical usage
Loctite 3090	Two-component cyanoacrylate gel	Up to 5 mm	15 N/mm²	Imperfect assemblies, porous surfaces
Loctite 401	Single-component liquid cyanoacrylate	< 0.1 mm	20 N/mm²	Fitted surfaces, metals, plastics
Loctite 454	Single-component cyanoacrylate gel	Up to 0.5 mm	18 N/mm²	Vertical surfaces, rubber
Permabond 820	Single-component liquid cyanoacrylate	< 0.1 mm	22 N/mm²	Metals, rigid plastics

The 3090 clearly stands out whenever the joint is not perfect. For flat, fitted surfaces, a Loctite 401 will suffice.

Applications and compatible materials for Loctite 3090

Loctite 3090 is a two-component cyanoacrylate adhesive designed for bonding poorly fitted or porous surfaces, where a standard CA fails.

Its activator, integrated into the second component, allows for filling gaps of up to 5 mm. This is its great strength compared to single-component versions.

Compatible materials:

• Plastics: ABS, PVC, polycarbonate, polyester
• Metals: steel, aluminum, brass, copper
• Elastomers: natural rubber, EPDM, neoprene
• Porous materials: wood, ceramic, stone, leather
• Mixed materials (multi-material assemblies)

Typical applications:

• Repairing cracked or broken plastic parts
• Assembling rubber seals and gaskets
• Bonding rough or sandy parts
• Rapid industrial on-site maintenance

Here is how it positions itself against other common cyanoacrylates:

Product	Type	Max. gap filled	Porous surfaces	Typical usage
Loctite 3090	Two-component CA	5 mm	✔ Yes	Irregular surfaces, repair
Loctite 406	Single-component CA	0.1 mm	Limited	Precise assembly, thin plastics
Loctite 454	Single-component CA gel	0.3 mm	Partial	Vertical surfaces, rubber
Cyberbond CB 2015	Single-component CA	0.2 mm	Limited	General use, metal/plastic

At Dagobert Industrie, we recommend the 3090 whenever surfaces are not perfectly flat or the gap between parts is visible to the naked eye.

Loctite 3090 vs. other cyanoacrylate adhesives: comparison table

Loctite 3090 is not a standard cyano. Its two-component system with integrated activator clearly distinguishes it from standard cyanoacrylate adhesives on the market.

To clarify, here is a direct comparison with other common references.

Product	Type	Admissible gap	Shock resistance	Porous surfaces	Setting time
Loctite 3090	Two-component cyano	Up to 5 mm	Very good	Excellent	10-120 s depending on gap
Loctite 401	Single-component cyano	< 0.1 mm	Average	Limited	5-30 s
Loctite 454	Single-component cyano gel	0.1-0.3 mm	Average	Fair	10-60 s
Permabond 910	Single-component cyano	< 0.15 mm	Low	Limited	5-20 s
Cyberbond CB 2250	Single-component cyano gel	0.1-0.2 mm	Average	Fair	15-45 s

The key difference: single-component cyanos do not polymerize correctly over large gaps. Loctite 3090 solves this problem thanks to its activator integrated into the cap.

It is therefore particularly well-suited for assemblies with irregular, porous, or poorly fitted surfaces, wood, foam, concrete, certain plastics, where a standard cyano fails.

At Dagobert Industrie, we recommend the 3090 as soon as the gap between parts exceeds 0.5 mm or the surfaces cannot be perfectly prepared.

Instructions for use and safety precautions

Loctite 3090 is a two-component adhesive: it requires simultaneous application of the cyanoacrylate and the activator. Follow a few simple rules to ensure an optimal bond.

Start by degreasing and drying the surfaces to be bonded. Any trace of oil, dust, or excessive moisture can reduce the final strength of the joint.

Apply the product directly from the two-component gun supplied with the mixing nozzle. Never mix the two components manually: the reaction is immediate and uncontrollable without the nozzle.

The positioning time is very short (a few seconds). Position the parts before applying, not after.

Work in a well-ventilated space. Cyanoacrylate vapors irritate the respiratory tract and eyes. Wearing nitrile gloves and safety glasses is recommended.

In case of skin contact, do not pull on the bonded skin. Use warm soapy water or a suitable solvent (acetone).

Storage and product shelf life

Store the cartridge at room temperature, between 8 °C and 21 °C, away from direct light and humidity.

After use, remove the used mixing nozzle and replace the original cap immediately. Do not reuse a nozzle that has already reacted.

The shelf life is 12 months from the date of manufacture, for unopened cartridges. Once opened, use it quickly to avoid internal clogging.