Choose your screed type below to view the full technical data sheet — Anhydrite (Gyvlon) for general residential and commercial screeding, or Cemfloor FSC for industrial wearing floors.
What is Gyvlon liquid flow screed?
Gyvlon is a calcium sulphate (anhydrite) flowing screed manufactured to BS EN 13813:2002. It blends specialist binder, selected aggregates and additives with potable water to produce a pumpable, self-smoothing, self-compacting screed delivered ready-mixed to site.
What is liquid flow screed used for?
Gyvlon flowing screed provides a smooth, level surface ready for the finished floor — tiles, engineered wood, vinyl, resin, carpet or polished concrete. It is suitable for residential, commercial and industrial use, and is fully underfloor heating compatible.
What are the key features and specifications?
Self-levelling, self-compacting, low shrinkage, high strength, excellent thermal conductivity, and compliant with EN 13813. Manufactured under ISO 9001 quality controls. Typical compressive strength is in the range C25–C30 depending on mix.
- Compressive strength: C25–C30 (N/mm²)
- Flexural strength: F4–F5
- Shrinkage: <0.05% (very low)
- Thermal conductivity: ~2.2 W/m·K (excellent for UFH)
- Density: ~2,000 kg/m³
What is the minimum application thickness?
Minimum depths depend on the floor build-up: fully bonded 25 mm, unbonded 30 mm, over insulation 35 mm domestic / 40 mm commercial, over underfloor heating 40–50 mm with 30 mm minimum cover above the pipework.
How does Gyvlon dry and cure?
Walkable within 24–48 hours. Drying rate is approximately 1 mm per day up to 40 mm thickness, then 0.5 mm per day above that. Force-drying via UFH commissioning can begin 7 days after pour — see our drying times guide.
What are the environmental and health & safety considerations?
Liquid screed uses calcium sulphate from recycled sources — a lower-carbon binder than Portland cement. During mixing and application some components are hazardous; consult the Health & Safety Data Sheets supplied with each delivery before handling.
A pump-applied, self-smoothing wearing screed for industrial and commercial substrates. Suitable as a finished floor in high-traffic areas — no final covering required.
Manufactured by Cemfloor · Supplied and installed by London Flow Screed
Foot traffic2–4 hrsAt +20°C ambient
Light industrial traffic24 hrsForklift wheel traffic
Full industrial traffic7 daysFull traffic loading
Application depth4–15mmBonded to solid substrates
Compressive strengthC 35Flexural strength F 10
Shrinkage at 28 days< 0.07%Negligible movement
What is Cemfloor FSC?
Cemfloor FSC is a pump truck-applied, self-smoothing wearing screed formulated from special cements, aggregates, and chemical admixtures. It levels industrial and commercial substrates and can be left as a finished floor in high-traffic areas — with far superior performance to traditional screeds, concrete, or anhydrite screeds.
The product is casein-free, low-emission, and low-alkalinity. It is suitable as a final finish in industrial areas, as a base for epoxy or polyurethane resin coatings, and in commercial spaces where a polished concrete effect is desired.
Cemfloor FSC is applied over the following solid bonded substrates:
- —Concrete
- —Sand and cement screeds
- —Anhydrite screeds
What is the full Cemfloor FSC technical specification?
Full technical specification for Cemfloor FSC as supplied. All values at +20°C ambient unless otherwise stated.
| Application temperature | +10°C to +25°C |
| Minimum substrate strength | 1.5 N/mm² |
| Minimum thickness | 4mm |
| Maximum thickness | 15mm |
| Water demand | 200 litres / 1,000kg (20%) |
| Compressive strength | C 35 |
| Flexural strength | F 10 |
| Shrinkage (28 days) | < 0.07% |
| Flow rate | 230–250mm |
| Approx. material consumption | 1.7 kg/m²/mm |
| Pot life | 20 min (after adding water) |
| Hardening — before foot traffic | 2–4 hours (normal conditions) |
| Hardening — before final covering | 24 hours (normal conditions) |
| Wear resistance (steel-wheel class) | BCA class AR 0.5 |
| Wear resistance (RW defined class) | RWA 100 |
| Pendulum Test Value — dry | 65 Low slip risk |
| Pendulum Test Value — wet | 40 Low slip risk |
| Pendulum Test Value — oil | 16 High slip risk |
| Shelf life (unopened, above 5°C) | 12 months from manufacture |
Oil contamination: The pendulum test value of 16 in oiled conditions indicates high slip potential. In industrial environments where oil, cutting fluids, or cleaning agents are present, surface protection with an epoxy or polyurethane resin coating is required.
How is Cemfloor FSC applied?
Cemfloor FSC is mixed and pumped using a Cemfloor Approved Pump Truck. The material is mixed with 20% water (200 litres per 1,000kg). Flow rate must be maintained at 230–250mm, verified continuously by flow ring test during mixing.
- 01Temperature control. During application and for at least one week afterwards, substrate and ambient temperature must remain between +10°C and +25°C. Relative humidity of the substrate must be below 95%.
- 02Ventilation. Light ventilation in the working area is required. Windows and door openings must remain closed to avoid draughts during application and for 3 days afterwards.
- 03Bay layout. Divide the floor into suitably sized bays using weberfloor 4965 barrier foam for bay formation and stop ends. Bay size is determined by pump capacity and application thickness.
- 04Pumping sequence. Pump in sections, moving to the next section as quickly as possible to maintain a wet edge. Use a wide serrated spatula or spike roller to assist self-levelling.
- 05Water ratio is critical. Excess water reduces strength, increases shrinkage, and encourages segregation. Do not exceed 200 litres per 1,000kg. Mix temperature should ideally be between +15°C and +20°C.
How long does Cemfloor FSC take to dry?
Drying times for Cemfloor FSC at +20°C ambient. High substrate humidity and poor drying conditions will prolong setting time.
| Foot traffic | 2–4 hours |
| Surface grinding (if required) | After 24 hours |
| Resin coating application | After 24 hours (if substrate is suitably dry) |
| Forklift / light industrial traffic | After 24 hours |
| Full industrial traffic | After 7 days |
Note: High substrate humidity and poor drying conditions will prolong setting time beyond the values above. These figures apply at +20°C ambient temperature in normal conditions.
How durable is Cemfloor FSC and what chemical resistance does it have?
Cemfloor FSC has similar chemical resistance to concrete. In environments subject to constant loading from chemicals, oils, cutting fluids, or cleaning agents, surface protection with an epoxy or polyurethane resin coating is required.
Industries where surface protection is necessary include food processing, abattoirs, dairies, fish processing, and similar. The product is compatible with most epoxy and polyurethane resin coatings and is ready to receive a coating after 24 hours provided the substrate is suitably dry.
Where left uncovered, the super-flat and smooth finish minimises surface wear and enables high-density storage racking. Wear resistance is rated BCA class AR 0.5 and RWA 100.
