Sika Ronacrete Unicell 40S

Features

• Meets HKHA Class 40 Repair Mortar Specification
• High build-up for thick applications
• Simple mixing — just add water
• Pre-packaged for consistent quality
• Suitable for structural applications
• Waterproof and impermeable
• Shrinkage-compensating (no cracking in Coutinho Ring test)
• Low VOC

Applications

• Filling gaps between window frames and concrete walls
• Door frame gap filling
• Roller shutter frame gap filling

Why Choose Unicell 40S

• HKHA approved: meets Class 40 RMS for public housing projects
• High strength
• Waterproof: very low water absorption
• No shrinkage: Coutinho Ring test — no cracking
• Easy to use: pre-blended, just add water and mix

Packaging

Important Notes

• Remove all dust, loose material and laitance from substrate
• Thoroughly dampen concrete surface with water
• For greater thicknesses, apply Unicell Primer first
• Add powder to container with appropriate water, mix to workable mortar
• Compact mortar into frame gaps to fill all voids
• Trowel smooth after appropriate time
• Clean tools immediately with water
• For detailed application methods, coverage rates and technical parameters, refer to the official product data sheet

FAQ

How does Unicell 40S differ from standard repair mortar?

Specifically designed for window frame gap filling, meeting HKHA Class 40 specification. Its waterproofing and shrinkage-compensating properties prevent window leakage. Standard mortars may not achieve equivalent performance.

Can Unicell 40S be used for general concrete repair?

Primarily designed for window, door and shutter frame gaps. For general concrete repair, Unicell 40 (general Class 40) or Unicell 25 (Class 25) are more suitable.