What is Loctite MR 5923 used for?

You use it to dress and improve existing pre-cut gaskets, as well as to seal close-fitting machined flanges and threaded connections in automotive and industrial setups.

Does this gasket dressing harden completely?

No, it air-dries slowly to form a pliable, semi-flexible film that reliably accommodates vibration and thermal expansion.

What temperatures and fluids is it resistant to?

It withstands temperatures from -54 °C to +204 °C and resists water, motor oil, gasoline, transmission fluids, and ethylene glycol.

How do you apply Loctite MR 5923?

Clean and degrease mating surfaces thoroughly. Then apply a uniform layer of sealant using the built-in brush applicator before assembly.

How do you remove residue of this sealant?

You can easily clean uncured or dried residue from metal surfaces using isopropyl alcohol.

LOCTITE 5923 liquid flexible gasket improver (117 ml bottle) - 233849

Name: LOCTITE 5923 liquid flexible gasket improver (117 ml bottle) - 233849
Brand: LOCTITE
SKU: 11030005
Price: 15.2 EUR
Availability: InStock

Supplier number: LOCTITE 233849 | EAN 5010266291925

15.20 tax incl.

€12.56 excl. VAT (incl. all environmental contributions)

On stock - immediately available

Ordered before 20:00 - delivered as of 03/10/2026
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.
Loctite Buy & Get deals are recognisable by the promotion label on the product page. Click the label to view all available deals.

Dependable sealing using Loctite MR 5923

Practical benefits

Pliable and flexible film: You create a semi-flexible seal that absorbs dynamic movements and vibrations without cracking.
High resistance to fluids: You protect assemblies against degradation caused by water, gasoline, motor oils, and transmission fluids.
Accurate and easy spreading: The liquid consistency lets you coat close-tolerance machined flanges and threaded joints with ease.

In a nutshell

The right choise for

With Loctite mr 5923, you achieve reliable sealing across machined flanges, threaded connections, and pre-cut gaskets. This liquid gasket dressing air-dries slowly to create a pliable, semi-flexible film that absorbs vibrations and thermal movements without cracking. Operating from -54 °C to +204 °C with high resistance to motor oil, gasoline, transmission fluid, water, and glycol, it effectively prevents leaks in oil pans, water pumps, and gearbox casings. The practical 117 ml bottle with a built-in brush applicator ensures clean, accurate, and even spreading across every mating surface.

Product information FAQ

€15.20

In stock - tax incl.

Key features according to our expert

Net volume: 117 ml
Relative density: 1,1
ADR packing group: II
ADR class: 3
Principal hazard property: GHS02 Flammable
UN number: UN1866
P-statements: P210; P261; P280; P333 + P313; P337 + P313
H-statements: H225; H317; H319; H336
Hazard class: GHS02 Flammable; GHS07 Harmful or irritant
Physical state: Liquid
Flash point: 15 °C
Packaging: Jar

Product description:

Dark reddish brown, viscous liquid thread sealant with a characteristic alcoholic odor.For close tolerance flanges
Slow drying
Flexible setting

Precautionary statements

P210: Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P261: Avoid breathing dust/fume/gas/mist/vapours/spray.
P280: Wear protective gloves/protective clothing/eye protection/face protection.
P333 + P313: If skin irritation or rash occurs: Get medical advice/attention.
P337 + P313: If eye irritation persists: Get medical advice/attention.

Hazard statements

H225: Highly flammable liquid and vapour.
H317: May cause an allergic skin reaction.
H319: Causes serious eye irritation.
H336: May cause drowsiness or dizziness.

All Features

Net volume: 117 ml
Relative density: 1,1
Adr packing group: II
Adr class: 3
Principal hazard property: GHS02 Flammable
Un number: UN1866
P-statements: P210; P261; P280; P333 + P313; P337 + P313
H-statements: H225; H317; H319; H336
Hazard class: GHS02 Flammable; GHS07 Harmful or irritant
Physical state: Liquid
Flash point: 15 °C
Packaging: Jar

Brand LOCTITE
11030005
EAN 5010266291925
Supplier number LOCTITE 233849

Frequently asked questions about this product

Answered by specialists

What is Loctite MR 5923 used for?: You use it to dress and improve existing pre-cut gaskets, as well as to seal close-fitting machined flanges and threaded connections in automotive and industrial setups.
Does this gasket dressing harden completely?: No, it air-dries slowly to form a pliable, semi-flexible film that reliably accommodates vibration and thermal expansion.
What temperatures and fluids is it resistant to?: It withstands temperatures from -54 °C to +204 °C and resists water, motor oil, gasoline, transmission fluids, and ethylene glycol.
How do you apply Loctite MR 5923?: Clean and degrease mating surfaces thoroughly. Then apply a uniform layer of sealant using the built-in brush applicator before assembly.
How do you remove residue of this sealant?: You can easily clean uncured or dried residue from metal surfaces using isopropyl alcohol.