Sikasil 670 Fire

Flexible Fire-Resistant Joint Sealant for Building Applications

Sikasil®-670 Fire is a one-component joint sealant specifically designed for applications requiring fire resistance. The product cures through atmospheric moisture, is easy to apply, and provides the flexibility needed to accommodate joint movement in construction applications.

This sealant is designed for joints and connections requiring fire protection on both porous and non-porous substrates, such as concrete, plaster, metal, glass, and common building materials. It provides good adhesion to a wide range of surfaces and excellent weather resistance, making it suitable for both interior and exterior applications.

Sikasil®-670 Fire provides fire resistance of up to 4 hours in accordance with EN 1366-4. It also accommodates joint movement of ±35% according to ASTM C 719, making it suitable for sealing applications requiring safety, durability, and a neat joint finish.

Applications of Sikasil 670 Fire

Sikasil®-670 Fire is suitable for fire-resistant joint sealing applications, such as:

• Wall and floor joints in buildings

• Joints around openings or connections requiring protection against fire spread

• Sealing applications on porous substrates, such as concrete, plaster, and cementitious materials

• Sealing applications on non-porous substrates, such as metal, glass, and smooth surfaces

• Joints in commercial buildings, factories, high-rise buildings, and areas where fire safety is a priority

• Interior and exterior applications requiring a weather-resistant sealant

Key Features of Sikasil 670 Fire

• One-component, fire-resistant joint sealant for convenient application

• Cures through atmospheric moisture

• Fire resistance of up to 4 hours according to EN 1366-4

• Accommodates joint movement of ±35% according to ASTM C 719

• Good adhesion to a wide range of substrates

• Suitable for both porous and non-porous surfaces

• Excellent weather resistance

• Easy to tool and apply, providing a neat joint finish

• Neutral-curing system that reduces potential effects on certain substrates

• Suitable for joints requiring both flexibility and fire-resistant performance

Substrate Preparation

The substrate must be:

• Clean

• Dry

• Sound

• Uniform

• Free from oil

• Free from grease

• Free from dust

• Free from loose materials

According to the product documentation, Sikasil®-670 Fire generally provides good adhesion without the need for a primer or activator. However, a suitable primer may be required in certain applications. sikasil_-670_fire

Application Method

1. Prepare the substrate properly.

2. Insert a backing rod to achieve the specified joint depth.

3. Apply a primer if necessary.

4. Insert the foil pack or cartridge into the sealant gun.

5. Apply Sikasil®-670 Fire into the joint, ensuring full contact with the joint edges.

6. Avoid trapping air during application.

7. Tool the sealant to ensure proper adhesion to the sides of the joint.

8. For a neat finish, use masking tape and remove it before the sealant begins to form a skin.

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