FAQs

Yes, FAS Fire Door Intumescent Acrylic Sealant has a shelf life of up to 18 months when stored unopened in temperate conditions between 5°C and 30°C. To help maintain product performance and longevity, the sealant should be stored in a cool, dry environment and protected from extreme temperatures. Always check the product packaging and technical documentation for storage recommendations before use.

Fire mastic, also known as fire-rated mastic or intumescent sealant, is used to seal gaps, joints and linear seals in walls and other building elements to help prevent the passage of fire, smoke and hot gases. Fire-stopping mastics are commonly used around construction joints, service penetrations and perimeter gaps where fire resistance needs to be maintained. To ensure compliance and performance, always check the relevant certification, technical documentation, and fire test evidence, and use a tested fire-stopping solution that is suitable for the specific application and construction type.

The coverage of fire-rated sealants will vary depending on the joint size and application method. As a guide:

• A 310ml cartridge will produce approximately 1 linear metre of sealant when applied as a 20mm x 15mm bead.
• A 600ml foil sausage will produce approximately 1.8 linear metres of sealant when applied as a 20mm x 15mm bead.

Actual coverage may vary depending on the joint dimensions, substrate condition and installation technique. For detailed application guidance and sealant consumption information, please refer to the relevant product datasheet.

The curing time for fire-rated mastic and intumescent sealant can vary depending on the product type, application depth and site conditions. In most cases, fire mastic will cure within 24 to 48 hours. Factors such as temperature, humidity and ventilation may affect drying and curing times. For product-specific guidance, always refer to the relevant technical datasheet or manufacturer’s installation instructions.

Yes, FAS Fire Door Intumescent Acrylic Sealant offers acoustic performance with sound reduction capabilities of up to 55dB Rw. In addition to providing a fire-resistant seal around joints, gaps and fire door installations, the sealant can help reduce the transmission of airborne sound through openings in walls and building elements. For full acoustic test data, installation guidance and certified performance information, please refer to the product datasheet.

Some fire-rated mastics and intumescent sealants may offer water resistance once fully cured; however, performance can vary depending on the product and application. It is always recommended to consult the relevant product datasheet or technical data sheet to confirm suitability for the intended environment. Where high levels of moisture are expected, or for external fire-stopping applications, a silicone-based fire-rated sealant is generally the recommended solution due to its suitability for exposed and damp conditions.

Yes, FAS Fire Door Intumescent Acrylic Sealant can be used in applications where smoke control is required. The sealant has smoke leakage test evidence in accordance with BS EN 1634-3: 2004, demonstrating its suitability for use as part of a tested fire and smoke sealing system. In addition to providing fire resistance, the sealant helps maintain the integrity of compartmentation by restricting the passage of smoke through joints and perimeter gaps. Always refer to the relevant certification, test evidence and installation guidance to ensure suitability for your specific application.

Yes, once fully cured or dry, most fire-rated mastics and intumescent sealants can be painted over. Painting can help achieve a neat finish while maintaining the appearance of fire-stopping and fire-sealing installations. However, compatibility may vary between products, so always refer to the relevant product datasheet, technical data sheet or manufacturer’s guidance for specific painting recommendations and application instructions.

FAS Fire Door Foam™ is a fire-rated expanding foam designed to simplify fire door installation and fire-stopping applications. Compared to traditional stone mineral fibre wool, it offers a quicker and more cost-effective installation method, helping to reduce labour time and overall project costs. When used with FAS Fire Door Intumescent Acrylic Sealant, it forms part of a tested fire door sealing system for perimeter gap sealing around fire door frames.

Fire mastic, also known as fire-rated mastic or intumescent sealant, is used to seal gaps, joints and linear seals where fire resistance needs to be maintained. Common applications include construction joints in walls, perimeter gaps around fire-resistant building elements, and service penetrations where pipes, cables or other services pass through fire-rated walls and floors. Fire-stopping mastics help restrict the spread of fire, smoke and hot gases through these openings. Always use a tested and certified fire-stopping system that is suitable for the specific application and construction type, and refer to the relevant certification and installation guidance before use.