Sika Sikacryl 620 Fire
Sika Sikacryl 620 Fire
Sikacryl 620 Fire — Fire Resistant Acrylic Sealant
Sikacryl 620 Fire is a one-component water-based acrylic sealant designed for fire-resistant linear joint sealing in walls and floors. It provides up to 4 hours of fire resistance (EN 1366-4), is over-paintable, requires no primers, and carries CE marking with European Technical Assessment certification.
Key Features
- Up to 4 hours fire resistance (EN 1366-4)
- Water-based, low VOC (GEV-Emicode EC1PLUS)
- Over-paintable
- No primers or activators required
- Good adhesion to a wide range of substrates
- Service temperature: -25°C to +70°C (dry)
- CE marked, ETA 20/1115 certified
- LEED v4 EQc 2 conformity
Applications
- Fire-rated wall joint sealing
- Fire-rated floor joint sealing
- Linear joint fire stopping between fire compartments
- Pipe and cable penetration perimeter fire sealing
- Fire joints on porous substrates (concrete, brick, morite)
- Fire joints on non-porous substrates
⚠️ Not suitable for floor joints, sanitary joints, natural stone, or civil engineering applications. Not for joints under water pressure or permanent immersion.
Technical Data
| Property | Value |
|---|---|
| Chemical Base | 1-part acrylic dispersion (water-based) |
| Fire Resistance | Up to 4 hours (EN 1366-4) |
| Density | ~1.65 kg/l (ISO 1183-1) |
| Service Temperature | -25°C to +70°C (dry) |
| Application Temperature | +5°C to +30°C |
| Skin Time | ~15 min @ 23°C / 50% RH |
| Curing Rate | ~2mm / 24 hours @ 23°C / 50% RH |
| Colour | White, grey |
| Packaging | 600ml foil pack (12/box) · 300ml cartridge (12/box) |
| Shelf Life | 24 months (unopened, original sealed, +5°C to +25°C) |
FAQ
What fire rating does Sikacryl 620 Fire achieve?
Up to 4 hours fire resistance when tested to EN 1366-4. The actual fire rating depends on joint dimensions and system design — refer to the Sika Passive Fire Protection Handbook for details.
Can it be painted over?
Yes. Sikacryl 620 Fire is over-paintable once cured. A compatibility pre-test is recommended to ensure paint adhesion.
Is a primer required?
No. Sikacryl 620 Fire adheres directly to clean, dry substrates without primers or activators.
