What is Loctite MR 5923 used for?

This liquid sealant is used to improve pre-cut gaskets and seal machined flange surfaces as well as close-fitting threaded connections.

Does the product remain flexible after drying?

Yes, it air-dries slowly to form a pliable, semi-flexible film that does not harden completely or become brittle.

What temperature range can Loctite MR 5923 withstand?

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

Can this sealant be used on existing pre-cut gaskets?

Yes, it is designed as a gasket dressing for materials such as paper, cork, or rubber to improve sealing performance and prevent leaks.

How do you clean up residues of Loctite MR 5923?

You can easily remove uncured or dried sealant from metal surfaces using isopropyl alcohol.

LOCTITE 5923 liquid flexible gasket improver (450 ml bottle) - 142270

Name: LOCTITE 5923 liquid flexible gasket improver (450 ml bottle) - 142270
Brand: LOCTITE
SKU: 11030006
Price: 32.8 EUR
Availability: PreOrder

Supplier number: LOCTITE 142270 | EAN 5010266189079

Recommended Retail Price €41.67

32.80 tax incl.

€27.11 excl. VAT (incl. all environmental contributions)

On order: delivered from 13/10/2026

The minimum purchase order quantity for the product is 12.

Ordered before 20:00 - delivered as of 13/10/2026
Free shipping
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 flexible sealing with Loctite

Practical benefits

Flexible and durable bond: You create a pliable, semi-flexible film that seals close-fitting flanges and absorbs vibrations without becoming brittle.
Generous time for assembly: The slow-drying formula gives you ample working time to align pre-cut gaskets and machined surfaces precisely.
Resistant to automotive fluids: You ensure long-term joint integrity against motor oil, transmission fluid, gasoline, water, and ethylene glycol.

In a nutshell

The right choise for

With Loctite mr 5923, you create a reliable and flexible seal on close-fitting flanges and machined surfaces. This liquid gasket dressing slowly air-dries into a pliable, semi-flexible film that will not become brittle and effectively absorbs vibrations. It is ideal for coating and enhancing pre-cut gaskets made of paper, cork, or rubber during the overhaul of engines, gearboxes, and pump housings. The slow-drying formula gives you ample time to position parts precisely without rushing. The 450 ml bottle provides durable resistance against motor oil, gasoline, coolant, and water across a wide temperature range from -54 °C to 204 °C.

Product information FAQ

€32.80

tax incl.

Key features according to our expert

Net volume: 450 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: 450 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
11030006
EAN 5010266189079
Supplier number LOCTITE 142270

Frequently asked questions about this product

Answered by specialists

What is Loctite MR 5923 used for?: This liquid sealant is used to improve pre-cut gaskets and seal machined flange surfaces as well as close-fitting threaded connections.
Does the product remain flexible after drying?: Yes, it air-dries slowly to form a pliable, semi-flexible film that does not harden completely or become brittle.
What temperature range can Loctite MR 5923 withstand?: It withstands temperatures from -54 °C to 204 °C and resists water, gasoline, motor oil, transmission fluid, and glycol.
Can this sealant be used on existing pre-cut gaskets?: Yes, it is designed as a gasket dressing for materials such as paper, cork, or rubber to improve sealing performance and prevent leaks.
How do you clean up residues of Loctite MR 5923?: You can easily remove uncured or dried sealant from metal surfaces using isopropyl alcohol.