What is Loctite SI 5920 used for?

This copper-coloured silicone sealant is designed for sealing flexible flanges and gaps up to 1 mm under high temperatures.

What is the maximum temperature resistance of this sealant?

The product withstands operating temperatures up to 350 °C and resists severe thermal cycling.

Which materials is this product compatible with?

It bonds reliably to machined or cast metal surfaces as well as various plastics.

Is Loctite SI 5920 electrically insulating?

Yes, in addition to flange gasketing, it is suitable for electrical insulating applications.

How does the sealant cure?

This 1-part moisture-curing silicone cures upon contact with ambient humidity to form a flexible, durable gasket.

LOCTITE 5920 silicone sealant copper-coloured (80 ml tube) - 2061258

Name: LOCTITE 5920 silicone sealant copper-coloured (80 ml tube) - 2061258
Brand: LOCTITE
SKU: 11010265
Price: 18.2 EUR
Availability: InStock

Supplier number: LOCTITE 2061258 | EAN 5390331429805

From 1 piece €18.20

From 12 pieces €17.29 - €10.92 saving

From 24 pieces €16.83 - €32.76 saving

From 36 pieces €16.38 - €65.52 saving

18.20 tax incl.

€15.04 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

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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.
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Reliable high-temperature sealing for flexible flanges

Practical benefits

Premium Loctite heat resistance: You seal flexible flanges safely in demanding environments with thermal resistance up to 350 °C.
Effective gap filling: You bridge gaps up to 1 mm on machined or cast surfaces with ease.
Non corrosive protection: You work safely on corrosion-sensitive metals and electrical assemblies using this insulating formula.

In a nutshell

The right choise for

With Loctite si 5920, you reliably seal flexible flanges and bridge gaps up to 1 mm under extreme thermal conditions up to 350 °C. This copper-coloured, 1-part silicone sealant cures upon contact with ambient moisture to form a durable, flexible gasket on machined or cast metal surfaces and plastics. Its non-corrosive, electrically insulating formulation prevents oil and fluid leaks on high-stress components such as exhaust manifolds, oil pans, valve covers, and industrial machinery. Supplied in an 80 ml tube, it lets you apply material precisely without needing hard-to-source pre-cut gaskets.

Product information FAQ

€18.20

In stock - tax incl.

Key features according to our expert

Net volume: 80 ml
Relative density: 1,03 - 1,06
ADR packing group: Not applicable
ADR class: Not applicable
Packaging: Tube
Principal hazard property: GHS05 Corrosive
UN number: Not applicable
P-statements: P201; P280; P305 + P351 + P338; P308 + P313; P333 + P313
H-statements: H317; H318; H350; H371
Hazard class: GHS05 Corrosive; GHS07 Harmful or irritant; GHS08 Health hazard
Physical state: Solid
Flash point: > 93 °C
Fire resistant: No

Product description:

LOCTITE SI 5920 is a low strength, silicone-based gasketing product.
For use on flexible flanges with machined or cast surfaces, the product is particularly suitable for high temperature applications up to 350°C.
It can be applied in gaps measuring up to 1 mm, as well as for electrical insulating applications.

Precautionary statements

P201: Obtain special instructions before use.
P280: Wear protective gloves/protective clothing/eye protection/face protection.
P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P308 + P313: IF exposed or concerned: Get medical advice/attention.
P333 + P313: If skin irritation or rash occurs: Get medical advice/attention.

Hazard statements

H317: May cause an allergic skin reaction.
H318: Causes serious eye damage.
H350: May cause cancer.
H371: May cause damage to organs.

All Features

Net volume: 80 ml
Relative density: 1,03 - 1,06
Adr packing group: Not applicable
Adr class: Not applicable
Packaging: Tube
Principal hazard property: GHS05 Corrosive
Un number: Not applicable
P-statements: P201; P280; P305 + P351 + P338; P308 + P313; P333 + P313
H-statements: H317; H318; H350; H371
Hazard class: GHS05 Corrosive; GHS07 Harmful or irritant; GHS08 Health hazard
Physical state: Solid
Flash point: > 93 °C
Fire resistant: No

Brand LOCTITE
11010265
EAN 5390331429805
Supplier number LOCTITE 2061258

Frequently asked questions about this product

Answered by specialists

What is Loctite SI 5920 used for?: This copper-coloured silicone sealant is designed for sealing flexible flanges and gaps up to 1 mm under high temperatures.
What is the maximum temperature resistance of this sealant?: The product withstands operating temperatures up to 350 °C and resists severe thermal cycling.
Which materials is this product compatible with?: It bonds reliably to machined or cast metal surfaces as well as various plastics.
Is Loctite SI 5920 electrically insulating?: Yes, in addition to flange gasketing, it is suitable for electrical insulating applications.
How does the sealant cure?: This 1-part moisture-curing silicone cures upon contact with ambient humidity to form a flexible, durable gasket.