What is Loctite SI 5699 used for?

You use it to seal rigid flanges, such as transmissions, oil pans, and cast metal housings.

Which materials does this silicone sealant adhere to?

It adheres effectively to machined or cast metal surfaces as well as various plastics.

Is Loctite SI 5699 resistant to oils and coolants?

Yes, it provides excellent resistance to engine oils, transmission fluids, and water-glycol mixtures.

How fast does the sealant cure?

The sealant becomes tack-free within 30 minutes and cures fully via ambient moisture.

Is this silicone sealant fire resistant?

No, this product is not fire resistant.

LOCTITE 5699 silicone sealant grey (80ml tube) - 2061022

Name: LOCTITE 5699 silicone sealant grey (80ml tube) - 2061022
Brand: LOCTITE
SKU: 11010275
Price: 19.6 EUR
Availability: InStock

Supplier number: LOCTITE 2061022 | EAN 5010266429830

From 1 piece €19.60

From 12 pieces €18.62 - €11.76 saving

From 24 pieces €18.13 - €35.28 saving

From 36 pieces €17.64 - €70.56 saving

19.60 tax incl.

€16.20 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 sealing for rigid flanges

Practical benefits

High fluid resistance: You protect assemblies against leaks thanks to superior resistance to automotive oils and water-glycol mixtures.
Loctite SI 5699 flexible gasket: You produce a tough elastomeric seal that easily withstands heavy vibration and joint movement.
Fast tack-free curing: You speed up component assembly with a moisture-curing silicone that becomes tack-free in 10 minutes.

In a nutshell

The right choise for

With the Loctite si 5699 GY, you quickly create a tough, flexible flange seal. This grey silicone sealant in a convenient 80 ml tube is designed for sealing rigid flanges on components such as transmissions, oil pans, valve covers, and cast housings. Thanks to its superior resistance to automotive oils and water-glycol mixtures, you reliably prevent leaks. It adheres firmly to machined or cast metal surfaces as well as plastics, easily withstanding joint movement, vibrations, and thermal expansion. Because the silicone becomes tack-free in just 10 minutes and cures with ambient moisture, you can speed up component assembly and finish maintenance jobs faster.

Product information FAQ

€19.60

In stock - tax incl.

Key features according to our expert

Net volume: 80 ml
Relative density: 1,5
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 + P311; 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 5699 is a flexible silicone sealant and cures on exposure to moisture in the air to form a tough rubber gasket.
The product is designed primarily for flange sealing with excellent oil resistance or rigid flange sealing for example on transmissions and cast metal housings.
It is tack-free after just 10 min.
The product is water-glycol resistant and can be used on machined or cast surfaces, metal or plastic.

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.
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: 1,5
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 + P311; 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
11010275
EAN 5010266429830
Supplier number LOCTITE 2061022

Frequently asked questions about this product

Answered by specialists

What is Loctite SI 5699 used for?: You use it to seal rigid flanges, such as transmissions, oil pans, and cast metal housings.
Which materials does this silicone sealant adhere to?: It adheres effectively to machined or cast metal surfaces as well as various plastics.
Is Loctite SI 5699 resistant to oils and coolants?: Yes, it provides excellent resistance to engine oils, transmission fluids, and water-glycol mixtures.
How fast does the sealant cure?: The sealant becomes tack-free within 30 minutes and cures fully via ambient moisture.
Is this silicone sealant fire resistant?: No, this product is not fire resistant.