CONTOPP Ultimate 4 is an advanced screed accelerator designed to significantly reduce drying times in cement-based screeds. This high-performance additive enables foot traffic within 24 hours and tiling within 48 hours, substantially expediting project timelines without compromising on strength or quality.
Key features and benefits:
- Accelerated drying: Allows for tile installation within 48 hours and resilient flooring within 4 days.
- Superior strength: Achieves CT-C40-F7 strength classification.
- Versatile application: Suitable for bonded, unbonded, and floating screeds.
- Reduced thickness: Enables screed depths as low as 20mm bonded and 35mm floating for domestic areas.
- Underfloor heating compatibility: Optimised for use with UFH systems.
- Environmental certification: EMICODE EC1 Plus certified for low-emissions.
- Moisture resistance: Suitable for damp environments and exterior applications.
- Easy integration: Compatible with standard 1:5 cement and sand mixes.
- Project efficiency: Significantly reduces overall project durations and material usage.
CONTOPP Ultimate 4 offers an optimal balance of performance and practicality, providing architects and specifiers with a reliable solution for accelerated screed installations. This innovative product addresses the growing demand for faster construction schedules and reduced screed thicknesses while maintaining high-quality standards.
Unit Size Available: 20kg Jerrycan.
Dosage: See Technical Data tab for typical dosages for 1:5, 1:6 and 1:8 mix designs.
Download the latest datasheets and certificates here;
KNOPP CONTOPP Ultimate 4 Technical Datasheet (TDS)
KNOPP CONTOPP Ultimate 4 Health & Safety Datasheet (SDS)
Typical Mix Designs:
| 1:5 MIX CT-C40-F7 | |||
| Material | Per M³ (KG) | Per 200L (KG) | Per Tonne (KG) |
| Sand | 1575 | 315 | 746 |
| Cement | 315 | 63 | 149 |
| Water | 158 | 32 | 75 |
| Ultimate 4 | 2.67 | 0.53 | 1.26 |
1:6 MIX CT-C30-F5 |
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| Material | Per M³ (KG) | Per 200L (KG) | Per Tonne (KG) |
| Sand | 1600 | 300 | 778 |
| Cement | 267 | 50 | 126 |
| Water | 144 | 27 | 68 |
| Ultimate 4 | 2.83 | 0.57 | 1.34 |
1:8 MIX CT-C20-F4 |
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| Material | Per M³ (KG) | Per 200L (KG) | Per Tonne (KG) |
| Sand | 1652 | 320 | 819 |
| Cement | 207 | 40 | 98 |
| Water | 120 | 23 | 57 |
| Ultimate 4 | 3.07 | 0.61 | 1.45 |
Performance at 1:5:
Compressive Strength
After 28 days approx. 40 N/mm²
Flexural Strength
After 28 days approx. 7 N/mm²
BRE category: A
Depths:
Bonded: 20mm
Undonded: 35mm+
Floating (Domestic): 35mm+
Floating (Commercial): 50mm+
UFH Clearance: 35mm above pipes
Typical Drying times:
20mm = 36 hours
30mm = 48 hours
40mm = 60 hours
50mm = 3 days
60mm = 5 days
70mm = 7 days
Underfloor Heating Commissioning:
After 24 hours: 35°C
After 48 hours: 55°C
After 72 hours: 45°C
After 96 hours: 25°C