Rapid setting, durable, cementitious self-leveling underlayment
Sika® Level-525 Rapid is a one-component, durable and
versatile cementitious underlayment for interior
concrete and cementitious substrates. It can be applied
manually or by pump to produce a self-smoothing,
rapid-setting, and flat substrate prior to the application
of a final floor finish. Typical application thickness is
1/16” to 1/2” (1.5 to 12.7 mm).
▪ Cement substrates
▪ Rapid drying cement screed systems
▪ OSB/Plywood only suitable for flexible coverings
▪ Ceramic tiles, terrazzo or natural stones
CHARACTERISTICS / ADVANTAGES
▪ Fluid self-leveling
▪ Levels new and renovates old floors
▪ Interior only
▪ Manual or pumpable applications
Excellent underlay for all type of residential and
▪ Compatible with subfloor heating systems
▪ Superior workability for easy installations
▪ Rapid setting for fast job turnaround
▪ Very high strength
▪ Very low shrinkage
Can accept caster wheel loading if the thickness is
greater than 1/8’’ (3.2 mm)
For forklift truck traffic, layer thickness at least 1/8”
Chemical Base Cement-based, polymer-modified binder system and fillers
Packaging 55 lb (24.9 kg) bag
Appearance / Color Gray powder
Shelf Life 12 months from date of production if stored properly in original, un opened
and undamaged sealed packaging
Storage Conditions Store dry at 41–86 °F (5–30 °C)
Protect from moisture. If damp, discard material
Compressive Strength 1 day 5,000 psi (34.5 MPa)
7 days 5,500 psi (38 MPa)
28 days 7,600 psi (52.4 MPa)
73 °F (23 °C)
50 % R.H.
Flexural Strength 28 days 1,600 psi (11 MPa) (ASTM C-293)
73 °F (23 °C)
50 % R.H.
Tensile Adhesion Strength 3 days at 1/8″ 400 psi (2.8 MPa) (ASTM C-1583)
Mixing Ratio 6-6.3 qts (5,75-6,0 L)
Fresh mortar density 118 lb/ft3 (1.8 kg/l) (ASTM C-138)
Coverage 30 ft2 at 1/4” (2.78 m2 at 6 mm) per bag
(Coverage figures do not include allowance for surface profile and porosity or material waste)
Layer Thickness Min. Max.
Neat 1/16” (1.5 mm) 1/2” (12.7 mm)
Extended 1/4” (6.3 mm) 1” (25 mm)
Product Temperature 65–75 °F (18–24 °C)
Ambient Air Temperature 41–86 °F (5–30 °C)
Note: When using water based adhesives on the finished product the best results will be achieved at ambient
and substrate temperatures between 59 and 77 °F (15–25 °C).
Relative Air Humidity < 75 %
Note: The substrate and uncured product applied on the floor, must be at least 5 °F above dew point to reduce
the risk of condensation, blooming or cement laitance forming on the surface.
Substrate Temperature 41–86 °F (5–30 °C)
Pot Life ~ 25 minutes
As the temperature will affect the pot life, application temperature:
▪ Above 73 °F (23 °C) will reduce the pot life and the working time.
▪ Below 73 °F (23 °C) will extend the pot life and the working time.
Waiting / Recoat Times Walk-on time: 1–1.5 hours
Suitable for overcoating with:
Non moisture sensitive floor covering 1.5–2 hours
Polyurthane adhesives 12 hours up to 1/8″ (9.5 mm)*