Which materials is Loctite SI 5366 suitable for?

This 1K silicone sealant bonds securely to glass, metals, ceramics, and most plastics for durable sealing.

What is the maximum operating temperature?

Loctite SI 5366 withstands service temperatures up to 250 °C and has a flash point above 150 °C.

Does this sealant require mixing before application?

No, it is a ready-to-use one-component (1K) system that cures upon contact with atmospheric moisture.

Is this silicone sealant fire-resistant?

No, this sealing product is not classified as fire-resistant.

What colour is the sealant once cured?

It cures to a transparent finish while remaining flexible and shock-absorbing.

LOCTITE 5366 1K sealant (100 ml) - 2063265

Name: LOCTITE 5366 1K sealant (100 ml) - 2063265
Brand: LOCTITE
SKU: 11010002
Price: 15.4 EUR
Availability: InStock

Supplier number: LOCTITE 2063265 | EAN 5010266009001

From 1 piece €15.40

From 12 pieces €14.63 - €9.24 saving

From 24 pieces €14.24 - €27.72 saving

From 36 pieces €13.86 - €55.44 saving

15.40 tax incl.

€12.73 excl. VAT (incl. all environmental contributions)

On stock - immediately available

Delivery by DHL

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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 Loctite sealing for demanding assemblies

Practical benefits

Ready for immediate use: You apply this 1-component silicone paste straight from the 100 ml tube without any prior mixing required.
Superior shock absorption: High elasticity significantly improves the load-bearing capacity of your bond while absorbing mechanical vibrations and impacts.
High thermal resistance: You create dependable, durable seals on heat sources, ovens, and heat exchangers operating at temperatures up to 250 °C.

In a nutshell

The right choise for

With the Loctite si 5366, you achieve dependable bonding and sealing on demanding industrial assemblies with ease. This ready-to-use 1-component silicone paste dispenses straight from the handy 100 ml tube, eliminating the need for prior mixing. It cures with atmospheric moisture into a clear, highly flexible seal that absorbs shocks and mechanical vibrations while enhancing the load-bearing capacity of your joint. Capable of withstanding service temperatures up to 250 °C, it delivers long-lasting seals on high-heat equipment such as ovens, heat exchangers, and steam circuits, while effectively protecting electrical enclosures and bonding glass, ceramic, and metal surfaces.

Product information FAQ

€15.40

In stock - tax incl.

Key features according to our expert

Net volume: 100 ml
EUH-statements: EUH441
Relative density: 1,04
ADR packing group: Not applicable
ADR class: Not applicable
Packaging: Tube
Principal hazard property: GHS07 Harmful or irritant
UN number: Not applicable
P-statements: P201; P273; P302 + P352; P337 + P313
H-statements: H315; H319
Hazard class: GHS07 Harmful or irritant
Physical state: Liquid
Flash point: > 150 °C
Fire resistant: No

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

Brand LOCTITE
11010002
EAN 5010266009001
Supplier number LOCTITE 2063265

Frequently asked questions about this product

Answered by specialists

Which materials is Loctite SI 5366 suitable for?: This 1K silicone sealant bonds securely to glass, metals, ceramics, and most plastics for durable sealing.
What is the maximum operating temperature?: Loctite SI 5366 withstands service temperatures up to 250 °C and has a flash point above 150 °C.
Does this sealant require mixing before application?: No, it is a ready-to-use one-component (1K) system that cures upon contact with atmospheric moisture.
Is this silicone sealant fire-resistant?: No, this sealing product is not classified as fire-resistant.
What colour is the sealant once cured?: It cures to a transparent finish while remaining flexible and shock-absorbing.