Loctite SI 5699 - Silicone Gasket Maker - 300ml

LOCTITE SI 5699 is a flexible, form-in-place RTV silicone gasket sealant designed for flange sealing and gasketing applications. It cures at room temperature when exposed to moisture in the air, forming a tough and flexible rubber gasket. It is particularly suitable for rigid flange sealing where resistance to oil and water/glycol is required.

LOCTITE SI 5699 can be used on flexible, machined and cast surfaces and is recommended for applications involving metal and plastic components. It is particularly useful for transmissions, cast metal housings and other industrial assemblies requiring a flexible, chemically resistant seal.

Key Features

• Flexible, form-in-place RTV silicone gasket sealant

• Moisture-cure system

• Forms a tough rubber gasket after curing

• Designed for all types of flange sealing

• Suitable for rigid flange sealing

• Excellent resistance to oil

• Resistant to water and glycol

• Suitable for metal and plastic substrates

• Grey in colour

• Suitable for corrosion-sensitive electrical assemblies

• Registered to NSF Category P1

• Operating temperature range of approximately -55°C to 200°C

Applications

LOCTITE SI 5699 is designed for a wide range of industrial sealing applications, including:

• Flange sealing

• Form-in-place gasket applications

• Rigid flange sealing

• Transmission housings

• Cast metal housings

• Automotive powertrain applications

• Industrial machinery

• Electric motor assemblies

• Heavy equipment

• Corrosion-sensitive electrical assemblies

Its flexibility makes it suitable where the sealing joint may experience movement or thermal expansion during service.

Oil, Water and Glycol Resistance

A key characteristic of LOCTITE SI 5699 is its resistance to oil and water/glycol, making it suitable for sealing applications where exposure to these fluids is expected. This makes the product particularly relevant for automotive and industrial equipment, including transmission and cast-housing applications.

Substrates

LOCTITE SI 5699 is recommended for use with:

• Metal

• Plastic

It can be applied to flexible, machined or cast surfaces when the joint and substrate are appropriate for silicone gasketing.

Curing

LOCTITE SI 5699 cures at room temperature through exposure to moisture in the atmosphere. During curing, the liquid sealant develops into a tough, flexible rubber gasket.

Henkel's product information lists a tack-free time of approximately 30 minutes. Actual cure time can vary depending on bead thickness, temperature, humidity, substrate and environmental conditions.

Technical Specifications

Specifications are based on Henkel's published product information and may vary by packaging or regional product version.

How to Use

1. Clean and dry the surfaces thoroughly.

2. Remove oil, grease, dust and other contaminants.

3. Apply an appropriate continuous bead of LOCTITE SI 5699 to the sealing surface.

4. Assemble the components according to the application's requirements.

5. Allow the sealant to cure before exposing the assembly to service conditions.

6. Follow the manufacturer's technical documentation for application-specific recommendations.

Packaging

Henkel currently lists LOCTITE SI 5699 in packaging options including 80 ml tubes and 300 ml standard cartridges, with other regional/package variants also listed.

Ideal for Industrial Gasketing

LOCTITE SI 5699 provides a combination of flexibility, oil resistance, water/glycol resistance and high-temperature capability, making it suitable for demanding flange and form-in-place gasket applications. It is particularly useful for automotive, industrial manufacturing, heavy equipment and electrical applications where reliable flexible sealing is required.

LOCTITE SI 5699 – Flexible RTV silicone gasket sealant for oil-, water- and glycol-resistant flange sealing.