Engineering Product Description
Sikacryl®-621 Firestop is a fire-resistant, one part, water-based acrylic sealant engineered for sealing service penetrations and joints in fire rated structures.
In the 2026 construction landscape, where civil defense codes are more stringent, this product acts as a vital barrier against the spread of flames, heat, and toxic gases.
It is designed to maintain the integrity of fire compartments in walls and floors, ensuring maximum safety for occupants.
Available through Specialist STC Company, it stands as a cornerstone for building compliance and structural safety.
Technical Specifications
Sikacryl-621 supplied via Specialist STC Company meets rigorous international standards (including EN 1366-3 and EN 1366-4):
Fire Resistance: Provides up to 240 minutes (4 hours) of protection depending on the joint configuration and backing material.
Acoustic Insulation: Offers excellent sound-dampening properties for structural joints.
Chemical Base: One-part acrylic dispersion.
Smoke Tightness: Effectively seals against the passage of cold and hot smoke.
Sustainability: Low VOC emissions, compliant with 2026 Green Building mandates.
Applications
Sikacryl-621 Firestop, distributed by Specialist STC Company, is essential for critical safety applications:
Service Penetrations: Sealing gaps around metal pipes and cable trays that penetrate fire-rated walls.
Linear Joints: Filling expansion and construction joints in fire-compartmented zones.
Commercial Infrastructure: Ideal for hospitals, hotels, and data centers where fire safety is non-negotiable.
Drywall & Masonry: Compatible with a wide variety of porous and non-porous substrates.
Key Features
User-Friendly: Easy to apply with standard caulking guns and can be cleaned with water before curing.
Excellent Adhesion: Bonds strongly to concrete, brick, gypsum, and various metals.
Paintable: The cured surface is compatible with most architectural coatings, allowing for a seamless aesthetic finish.
Cost-Efficiency: Provides high-tier safety performance at a competitive rate for large-scale developments.
Durability: Maintains its protective properties over the building’s lifecycle without cracking.
Installation Guide (Engineering Protocol)
To ensure maximum protection from Specialist STC Company supplies:
Preparation: Joints must be clean, dry, and free from oil, dust, or loose particles.
Backing Material: Use stone wool (Rockwool) as a backer to enhance fire resistance according to the specific fire rating required.
Application: Extrude the sealant firmly into the joint, ensuring full contact with the flanks and avoiding air pockets.
Finishing: Tool the surface with a wet spatula for a smooth, professional appearance before skin formation.