Sika Sikacryl 620 Fire

Overview: Sikacryl®-620 Fire is Sika's single-component water-based acrylic fire sealant, designed for fire-stopping linear joints in walls and floors. Tested to EN 1366-4, it provides long fire-resistance performance, can be overpainted once cured, needs no primer, and carries CE marking and a European Technical Assessment.

Product description

Sikacryl 620 Fire uses a water-based acrylic formulation for fire-rated joint sealing on porous and non-porous substrates. It applies directly with no primer or activator, can be overpainted once cured, is low-VOC (GEV-EMICODE EC1PLUS) and meets LEED v4 green-building requirements.

Key features

• Certified fire performance — tested to EN 1366-4, providing long fire resistance (up to 4 hours; actual rating depends on joint design and the tested system)
• Water-based, low VOC — passes GEV-EMICODE EC1PLUS, meets LEED v4
• Overpaintable — can be painted once cured to suit decorative requirements
• No primer or activator — applies directly on clean, dry substrates
• Good adhesion — adheres well to many common substrates, with good workability

Main uses

• Fire-rated joint sealing in walls
• Fire-rated joint sealing in floors
• Linear joint fire-stopping between fire compartments
• Fire sealing around pipe and cable penetrations
• Fire-rated joints on porous (concrete, brick, mortar) and non-porous substrates

⚠️ Not suitable for floor joints, sanitary joints, natural stone or civil-engineering applications, and must not be used where subject to water pressure or long-term immersion.

Why choose Sikacryl 620 Fire

• Passive fire protection — certified fire resistance, meeting linear-joint fire-stopping requirements
• Eco formulation — water-based, low VOC, EC1PLUS certified, meets LEED v4
• Easy application — no primer or activator, applies directly, overpaintable once cured
• International certification — CE marking, ETA 20/1115, EN 13501 fire classification, BS 476 test reports and IMO marine approval

Application notes

• Substrate must be clean, dry and free of oil and loose material
• No primer or activator needed — apply directly
• Tool the sealant flat after application to ensure full contact with both joint faces
• For neat joint lines, use masking tape and remove before skinning
• Tool with clean water; do not use solvent-based tooling agents
• Avoid structural movement and sharp temperature swings during application
• Clean tools with water immediately after use; once cured, remove mechanically only

FAQ

What is the fire rating of Sikacryl 620 Fire?
Tested to EN 1366-4, it provides long fire-resistance performance. The actual rating depends on joint size and system design, and must be read against the relevant test report and Sika's passive fire-protection manual.

Can it be painted once cured?
Yes. It can be overpainted once cured; a paint-compatibility test is recommended first.

Does it need a primer?
No. It can be applied directly on clean, dry substrates.

Most products typically in stock; individual items welcome to enquire. For detailed technical data and fire-system design, refer to the product Technical Data Sheet (TDS) and passive fire-protection manual, or WhatsApp Wah Hing.