Description
Sikaflex PRO Sealant is a ready-to-use polyurethane sealant designed for movement and connection joints on porous substrates as well as general indoor and outdoor sealing applications. It bonds strongly to a genuinely wide range of building materials (brick, cement, ceramics, metals and timber) without requiring a primer in most cases, which is a real practical advantage over sealants that need substrate-specific priming before every application.
Once cured, it forms a tough, elastic seal with high weathering and ageing resistance, rated for a movement capability of ±25% under ASTM C 719 and able to accommodate expansion and contraction rates of 25% to 30% in building materials without cracking. That flexibility is what makes it genuinely suited to movement joints rather than just static gap-filling, where a rigid sealant would eventually fail as the joint moves.
Its ready-to-use, easy-to-gun formulation applies cleanly to vertical and horizontal surfaces without sagging, and it’s available across 11 colours, from neutral White and Off White through to Brick Red and Dark Amber, giving genuine flexibility to match surrounding building materials rather than being limited to a single generic shade. For critical, high-performance applications such as multi-storey buildings, highly stressed joints or water immersion, specific priming procedures using Sika’s own primer and activator range are recommended for optimum adhesion.
Technical Specifications
| Formula | Polyurethane |
|---|---|
| Colour | 11 colours: White, Off White, Sandstone, Pale Brown, Japan Beige, Grey, Dark Grey, Brick Red, Redwood, Black, Dark Amber |
| Size | 310ml cartridge (12 per box) or 600ml foil pack sausage (20 per box) |
| Movement capability | ±25% (ASTM C 719) |
| Density | Approx. 1.25kg/L |
| Shelf life | 12 months from production, unopened original packaging |
Where to Use
- Movement and connection joints on porous substrates
- Brick, cement, ceramics, metal and timber, interior and exterior
- General building sealing applications, vertical and horizontal
How to Apply
- Prepare the substrate: clean, dry, sound and free from oils, grease, dust and loose particles.
- Prime non-porous substrates if required using Sika Aktivator-205 and/or Sika Primer-3 N depending on the material.
- Prime porous substrates if required: concrete, aerated concrete and cement-based renders with Sika Primer-3 N.
- Apply with a caulking gun: gun the sealant into the prepared joint.
- Allow to cure: into a tough, elastic seal over the specified curing period.
Important Notes
- Store in dry conditions, protected from direct sunlight, between +5°C and +25°C.
- Allow the correct flash-off time after priming before sealing.
- Contact Sika Technical Services for detailed advice on critical or high-performance applications.
