Sikafloor®-291
3-component epoxy self-smoothing underlay screed
Sikafloor®-291 is a three part, fine textured self smoothing underlay and levelling screed.
- Economical
- Fast and easy application
- Good levelling properties
- Good chemical resistance
- Good early and final mechanical strengths
- Ideal preparation for smooth surface finishes
- Contains no solvents
Usage
As a self-smoothing screed for:- Levelling layer under Epoxy, Polyurethane and PMMA* floor coatings / screeds, tiles, sheet floors, carpets or wooden floors.
- Floor topping without particular aesthetic requirements.
Advantages
- Economical
- Fast and easy application
- Good levelling properties
- Good chemical resistance
- Good early and final mechanical strengths
- Ideal preparation for smooth surface finishes
- Contains no solvents
Packaging
Pre-batched 164 kg units.
Part A: 8.00 kg container
Part B: 20.0 kg container
Part C: 34.0 kg plastic lined bag x 4
Colour
Part A - resin: white liquid
Part B - hardener: yellowish liquid
Part C - filler: off white, powder
Mixed colour: light yellow
Finish: fine textured, matt
Product Details
Shelf Life
12 months for component A&B
09 months for component C from date of production
Storage Conditions
The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +35 °C.
Density
Part A: ~ 1.05 kg/l (at +20°C)
Part B: ~ 1.03 kg/l (at +20°C)
Part C: ~ 1.72 kg/l (at +20ºC)
| Parts A+B+C mixed: ~ 2.2 kg/l (at +20°C) | ((EN 1015-6)) |
Abrasion Resistance
| ~ 0.7 mm thickness loss | (According to IS 1237 – 1980 and IS 9162 - 1979) |
Compressive Strength
| ~ 60 N/mm2 (28 days / +27°C) | (According to IS 9162-1979) |
Tensile Strength in Flexure
| ~ 18 N/mm2 (28 days / +27°C) | (According to IS 9162-1979) |
Tensile Adhesion Strength
| > 1.5 N/mm² (failure in concrete) | (According to ISO 4624) |
Chemical Resistance
The Sikafloor® -291 has improved chemical resistance over plain concrete in aggressive environments, but is not designed as a chemical protection. For specific chemical resistance, always overcoat with a suitable product of the Sikafloor® range. For occasional exposure or spillages, please consult.
Service Temperature
-30°C to +80°C for continuous exposure.
Application
Mixing Ratio
Part A : Part B : Part C = 1 : 2.5 : 17 (by weight)
Layer Thickness
1.5 mm min. / 3.0 mm max.
Ambient Air Temperature
+8°C min. / +30°C max.
Relative Air Humidity
80% max.
Dew Point
Beware of condensation!
The substrate and uncured floor temperature must be at least 3°C above the dew point to reduce the risk of condensation or blooming on the floor finish.
Substrate Temperature
+8°C min. / +30°C max.
Substrate Moisture Content
≤ 4% moisture content.
Test method: Sika® Tramex moisture meter, CM measurement or Oven-dry method. No rising moisture according to ASTM (PE sheet test).
Pot Life
20.5 kg mass
| Temperature / r.h. 75% | Time |
| +10°C | ~ 40 minutes |
| +20°C | ~ 20 minutes |
| +30°C | ~ 10 minutes |
Waiting Time / Overcoating
Before applying Sikafloor®-291 on Sikafloor®-290 Primer allow:
| Substrate temperature | Waiting time(Minimum) | Waiting time(Maximum) |
| +10°C | 12 hours | 72 hours |
| +20°C | 6 hours | 48 hours |
| +30°C | 4 hours | 24 hours |
Sikafloor®-291 can be overcoated with vapour tight coatings when the surfacehumidity falls below 4%! Not earlier than:
| Substrate temperature | Waiting time |
| +10°C | 2 days |
| +20°C | 1 day |
| +30°C | 1 day |
Note: Successive coats of Sikafloor®-291 must be applied after priming with Sikafloor®-290 Primer and allowing at least the minimum times indicated above between applications.
Times are approximate at 75% r.h. and will be affected by changing ambient and substrate conditions, particularly temperature and relative humidity.
Applied Product Ready for Use
| Temperature | Foot traffic | Light traffic | Full cure |
| +10°C | ~ 24 hours | ~ 3 days | ~ 14 days |
| +20°C | ~ 15 hours | ~ 2 days | ~ 7 days |
| +30°C | ~ 7 hours | ~ 1 day | ~ 4 days |
Note: Times are approximate and will be affected by changing ambient and substrate conditions.
Consumption
| Coating System | Product | Consumption |
| Primer | Sikafloor®-290 Primer | 0.2 – 0.3 kg/m2 |
| Underlay / levelling screed | Sikafloor®-291 | 2.2 kg/mm/m2 |
| Topping (optional) | Sikafloor® range | See PDS |
These figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level or wastage, etc.
MIXING
Prior to mixing, shake part A and part B briefly until homogenous, then pour both parts into the mixing container and mix thoroughly for 3 minutes until a uniform mix has been achieved.
Gradually add part C while stirring with a power mixer. Mix thoroughly for 3 minutes until a uniform mix has been achieved.
Mix using a slow speed electric mixer (300 - 400 rpm) with helical paddle or other suitable equipment.
Recommended are single or counter rotating double mortar (basket type) and forced action (pan type) mixers. Free fall mixers must not be used.
APPLICATION
Place mixed Sikafloor®-291 onto the primed substrate and spread evenly to the required thickness uniformly with a rubber or metal trowel or spatula and immediately roll with a spike roller to remove entrapped air and obtain an even thickness layer.
Do not use additional water, which would disturb the surface finish and cause discolouration.
A seamless finish can be achieved if a ‘wet’ edge is maintained during application.
CLEANING OF TOOLS
Clean all tools and application equipment with water immediately after use.
Hardened / cured material can only be removed mechanically.
CLEANING
Due to the texture of its surface, Sikafloor®-291 is not suitable to be used as wearing layer where easy staining can occur. A seal coat of the Sikafloor® range with suitable cleaning capabilities is advisable.
Remove dirt using a brush and/or vacuum. Do not use wet cleaning methods until the product is fully cured.
Do not use abrasive methods or cleaners.