What is Loctite SI 5366 used for?

This industrial acetoxy silicone sealant is designed for flexible bonding, sealing, and protecting components.

What is the temperature resistance of this silicone?

This sealant is suitable for operating conditions with temperatures up to 250 °C.

Does this product require mixing before use?

No, it is a 1-part silicone that cures at room temperature upon exposure to atmospheric moisture.

How quickly does the silicone form a skin?

At 23 °C and 50% relative humidity, the surface becomes tack-free within 5 minutes.

Is this silicone sealant fire-resistant?

No, this silicone is not fire-resistant.

LOCTITE 5366 1K sealant/glue clear (310 ml cartridge) - 2063268

Name: LOCTITE 5366 1K sealant/glue clear (310 ml cartridge) - 2063268
Brand: LOCTITE
SKU: 11010005
Price: 31.2 EUR
Availability: InStock

Supplier number: LOCTITE 2063268 | EAN 5010266240329

From 1 piece €31.20

From 12 pieces €29.64 - €18.72 saving

From 24 pieces €28.86 - €56.16 saving

From 36 pieces €28.08 - €112.32 saving

31.20 tax incl.

€25.79 excl. VAT (incl. all environmental contributions)

On stock - immediately available

Ordered before 20:00 - delivered tomorrow 02/10/2026
Shipping costs €11.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL
Delivered from Belgium

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How does it work?

For a purchase value of €99 to €125 excl. VAT, receive FREE LOCTITE 55 thread sealing cord 50 m (IDH 528244) worth €9.99.
For a purchase value of more than €125 excl. VAT, receive FREE LOCTITE SF 7850 hand cleaner 400 ml (IDH 2098250) worth €13.21.
The free item is automatically added to your order. No registration is required.
The promotion is valid from 01.10.2026 to 31.10.2026.
Loctite Buy & Get deals are recognisable by the promotion label on the product page. Click the label to view all available deals.

Reliable bonding with Loctite SI 5366

Practical benefits

Enhanced shock and vibration absorption: You protect assemblies from dynamic mechanical strain thanks to the elastic acetoxy silicone formulation with high elongation at break.
Fast single-component dispensing: You apply this 1-part adhesive straight from the cartridge without mixing, speeding up maintenance and industrial sealing tasks.
High thermal operating resistance: You create resilient seals around ovens, heat exchangers, and electrical enclosures that operate reliably at temperatures up to 250 °C.

In a nutshell

The right choise for

With Loctite si 5366, you create a resilient, flexible bond that reliably absorbs vibrations and mechanical shocks. This clear 1-part acetoxy silicone adhesive dispenses straight from the 310 ml cartridge, saving valuable time without any mixing required. Curing upon contact with atmospheric moisture, it forms a tack-free surface in just 5 minutes at room temperature. You can confidently seal high-temperature components like ovens, heat exchangers, and steam circuits operating up to 250 °C. Whether you are bonding windows, insulating junction boxes, or handling routine industrial maintenance, you achieve a clean, unobtrusive seal that holds under demanding conditions.

Product information FAQ

€31.20

In stock - tax incl.

Key features according to our expert

Net volume: 310 ml
EUH-statements: EUH441
Packaging: Cartridge
ADR packing group: Not applicable
ADR class: Not applicable
UN number: Not applicable
Principal hazard property: GHS07 Harmful or irritant
Relative density: 1,04
P-statements: P201; P273; P302 + P352; P337 + P313
Hazard class: GHS07 Harmful or irritant
Physical state: Solid
Flash point: > 150 °C
Fire resistant: No
H-statements: H315; H319

Product description:

LOCTITE SI 5366 is a 1K, clear industrial acetoxy silicone sealant/adhesive, designed specifically to ensure perfect sealing as well as bonding and protection.
Typical applications include sealing side windows in trains, sealing heat sources (ovens, heat exchangers, steam circuits, water heaters), providing protection/insulation of electrical boxes, bonding of HCR silicones and in general maintenance.
It offers high elongation at break of 530%.

Precautionary statements

P201: Obtain special instructions before use.
P273: Avoid release to the environment.
P302 + P352: IF ON SKIN: Wash with plenty of water/…
P337 + P313: If eye irritation persists: Get medical advice/attention.

Hazard statements

H315: Causes skin irritation.
H319: Causes serious eye irritation.

All Features

Net volume: 310 ml
Euh-statements: EUH441
Packaging: Cartridge
Adr packing group: Not applicable
Adr class: Not applicable
Un number: Not applicable
Principal hazard property: GHS07 Harmful or irritant
Relative density: 1,04
P-statements: P201; P273; P302 + P352; P337 + P313
Hazard class: GHS07 Harmful or irritant
Physical state: Solid
Flash point: > 150 °C
Fire resistant: No
H-statements: H315; H319

Brand LOCTITE
11010005
EAN 5010266240329
Supplier number LOCTITE 2063268

Frequently asked questions about this product

Answered by specialists

What is Loctite SI 5366 used for?: This industrial acetoxy silicone sealant is designed for flexible bonding, sealing, and protecting components.
What is the temperature resistance of this silicone?: This sealant is suitable for operating conditions with temperatures up to 250 °C.
Does this product require mixing before use?: No, it is a 1-part silicone that cures at room temperature upon exposure to atmospheric moisture.
How quickly does the silicone form a skin?: At 23 °C and 50% relative humidity, the surface becomes tack-free within 5 minutes.
Is this silicone sealant fire-resistant?: No, this silicone is not fire-resistant.