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.
