SikaLevel®-250

Cement-based, fillers and Sika’s latest generation of polymers

12 months in original, unopened bag.

Stored (unopened) in its original packaging, in a dry place between 5 °C (41 °F) and 32 °C (90 °F). For best results, condition product between 18 °C (65°F ) and 29 °C (84 °F) before using.

(wet mix) 2.1 kg/L (132 lb/ft³) ASTM C185

> 2 MPa (290 psi) failure in the substrate

Betweem 4.75 L and 5 L (1.25 and 1.32 US gal) water per 22.7 kg (50 lb) bag

Between 5 °C (41 °F) and 35 °C (95 °F)

< 75 %

  
Note: The substrate and uncured product applied on the floor, must be at least 3 °C above dew point to reduce the risk of condensation, blooming or cement laitance forming on the surface.

Between 13 °C (55 °F) and 32 °C (90 °F)

Can be walked on after 3 hours

Floor covering installation:

• Ceramic tile and moisture-insensitive stone: 3 hours
• All other floor coverings: Between 16 hours and 3 days depending on the type of floor covering.

Note: The above data is provided as an indication, for a temperature of 23 °C (73 °F) and ambient relative humidity of 50 % when applied at 9 mm (3/8 in). Drying will be affected by the actual job site conditions (such as temperature and relative humidity in particular). Prior to the installation of the SikaLevel®-250 system, the moisture level in the concrete slab must be measured following the written instructions and meet the requirements of the manufacturer of the floor covering to be installed.

SikaLevel®-250 provides up to 20 minutes of working time.

~15.3 L (4 US gal) per 22.7 kg (50 lb) bag

Approximate coverage at typical thicknesses per 22.7 kg (50 lb) bag:

• 6 mm (1/4 in) 2.4 m² (26 ft²)
• 12 mm (1/2 in) 1.2 m² (13 ft²)

Note: Coverage figures do not include allowance for surface profile and porosity or material waste.

Substrate to have adequate strength, load-bearing capacity, be dimensionally stable and be permanently dry.

Use between 4.75 L and 5 L of potable water [~ 21°C (~ 70 °F)] for each 22,7 kg bag of SikaLevel®-250.

Manual mixing

Pour the appropriate amount of water into a suitably sized and clean mixing container, using a calibrated measuring jug, or similar, to ensure strict control of the water content (do not add more water). Add SikaLevel®-250 to the water, while slowly mixing, adding the complete contents of the bag. If available water is not at this temperature, then consideration should be given to cooling/heating the water. Mix with a high-speed drill (> 650 rpm) and an egg beater style mixing paddle to blend water and powder for approximately three (3) minutes, until a lump-free and uniform mix has been produced. Do not overmix or allow the paddle to rise above the level of material as this will introduce and entrap air into the mix, potentially shortening the working life or causing pin-holing at the surface of SikaLevel®-250.

Pump mixing

Pump mixing can save time over manual mixing.  Best industry practice will ensure proper performance of any self-levelling material and Sika wishes to share some important ones with you:

• SikaLevel®-250 can be mechanically mixed with a continuous mixer and pump using a minimum of 40 m (130 ft) of hose or with a batch mixer and pump using a minimum of 25 m (80 ft) of hose. Some mixing occurs as the material travels through the hose but minimum length is critical to ensure proper consistency and lump-free material is delivered. Furthermore, when using a batch mixer, do not cut short on the mixing time (to ensure a homogeneous mix, prevent segregation, etc.).
• Consideration should be given about how the hose is held at delivery (above the shoulder). This will help provide some back pressure in the hose which can generally improve the consistency at delivery. 
• Verify flow periodically (at least for each skid of self-levelling material).  
• Ensure that water pressure/output to the mixing equipment is fairly consistent. Variation of water pressure at source will impact on the consistency of SikaLevel®-250.
• Do not exceed water ratio. The consistency and flow time will seem better but this will invite segregation which results in increase shrinkage (crack development) and weak/soft surface. 

Pour the mix and spread using a smoothing trowel. Even surfaces are easily achieved using a pin leveller. It’s not recommended to remove trowelling defects or to level more than once. SikaLevel®-250 has an approximate self-healing (working) time of up to 20 minutes at 23 °C (73 °F). SikaLevel®-250 can be applied from 3 mm to 30 mm (1/8 in to 1 1/4 in) in a single application. Apply enough SikaLevel®-250 to sufficiently cover all high spots. Smooth the surface with a smoother tool to obtain an even surface. Consider the width of the pour so as to maintaining a wet edge throughout placement. If a second layer of levelling compound has to be applied, prime the first layer with Sika® Level-03 Primer Plus (1:1) when the first layer is walkable. The second layer must not exceed the layer thickness of the first layer. Protect curing SikaLevel®-250 from high ambient temperatures, direct sunlight and drafts.

Note: Jobsite trials (while considering possibly also including the floor covering) are recommended to establish suitability of application equipment and technique, acceptable workmanship, consumption and coverage rates and the performance of the floor system as a whole.

PROTECTING NEWLY COMPLETED POURED FLOOR

On completion of installation of sv(name). It is the responsibility of the owner/agent or general contractor to protect the floor from dust and dirt until such time that the flooring installation is completed.  

SikaLevel®-250 must be allowed to air cure. Do not wet cure or use curing and sealing compounds.

Clean all tools and application equipment with water immediately after use. Hardened / cured material can only be removed mechanically.