Sikafloor®-20 PurCem® (AE)
Sikafloor®-20 PurCem® (AE) is a multi-component, water-based coloured polyurethane-cement hybrid flooring screed. It has flat, high abrasion, chemical, impact and slip resistant surface. It is typically installed at 6 - 9 mm. Suitable for use in hot and tropical climatic conditions.
- Very good chemical resistance
- Excellent mechanical resistance
- High glass transition point
- Non tainting /odourless
- Can be applied to substrates with high moisture content (7 days old or mature damp concrete)
Usage
Sikafloor®-20 PurCem® (AE) is used as a final flooring wear layer in Sikafloor® PurCem® HM-20 system build up in areas of high mechanical abrasion and impacts, aggressive chemical attack, thermal shocks and high temperature stresses. The product can also be used as an underlayment and level screed for Sikafloor® PurCem® flooring systems by adding defined aggregates.Advantages
- Very good chemical resistance
- Excellent mechanical resistance
- High glass transition point
- Non tainting /odourless
- Can be applied to substrates with high moisture content (7 days old or mature damp concrete)
Packaging
| Part A | 5.0 kg plastic jerrycan |
| Part B | 4.6 kg plastic jerrycan |
| Part C | 2 x 19.40 kg plastic lined, double paper bags |
| Part D | 1.6 kg plastic pouch |
Part A + B + C + D: 50 kg ready to mix units
Colour
| Part A | Light beige liquid |
| Part B | Brown liquid |
| Part C | Natural grey powder |
| Part D | Colourpack as per list below |
Standard colours: Stone grey, Beige, Grass Green, Oxide Red.
Other colours upon request: Traffic Grey, Maize Yellow, Slate Grey.
Product Details
SUSTAINABILITY
- Sikafloor®-20 PurCem® (AE) is certified according "Low Emitting Materials as per Al Sa'fat - Dubai Green Building Evaluation System" by Dubai Central Laboratory (DCL) certificate No. CL17020432
Composition
Water-based polyurethane cement hybrid
Shelf life
| Part A | 12 months from date of production. Protect from freezing. |
| Part B | 12 months from date of production. Protect from freezing. |
| Part C | 6 months from date of production. Must be protected from humidity. |
| Part D | 6 months from date of production. Protect from freezing. |
Storage conditions
The package must be stored properly in original, unopened and undamaged sealed packaging, in dry conditions at temperatures between +5 °C and +30 °C. Protect from direct sunlight, heat and moisture.
Density
Part A + B + C + D mixed: ~2.08 kg/l (+20°C)
Volatile organic compound (VOC) content
| < 1 g/l | (US EPA 24) |
Shore D Hardness
| ~80 - 85 | (ASTM D 2240) |
Resistance to impact
| >2.6 kg-m (25 joules) No cracks or any other surface damages | (ASTM D2794) |
Abrasion resistance
| ~2 g (2000 mg) (H-22 / 1000 g / 1000 cycles) | (ASTM D4060) |
Compressive strength
| ≥ 45 N/mm2 (28 d / +23 °C / 50 % r.h.) | (ASTM C579) |
Tensile strength in flexure
| ≥ 15 N/mm2 (28 d / +23 °C / 50 % r.h.) | (ASTM C580) |
Tensile adhesion strength
| > 2.0 N/mm2 (Concrete failure) | (EN 1542) |
Coefficient of thermal expansion
| 2.4 x 10-6 cm/(cm°C) | (ASTM D696) |
Reaction to fire
| Reaction to fire classification: Bfl-s1 | (EN 13501-1) |
Chemical resistance
For further information please contact Sika's Technical Department
Thermal compatibility
| Pass (No sign of cracks) | (ASTM C884) |
Water absorption
| ~0.19% | (ASTM C413) |
Skid / slip resistance
| >90 BPN Value (Dry) | (BS 7976-2) |
Application
Mixing ratio
Mix full units only.
Ambient air temperature
+10 °C min. / +30 °C max.
Layer thickness
Wear coat 6 - 9 mm
Underlayment screed 12 - 30 mm (when defined aggregates added)
Relative air humidity
85 % max.
Dew point
Beware of condensation!
The substrate and uncured floor must be at least 3 °C above dew point to reduce the risk of condensation or blooming on the floor finish.
Substrate temperature
+10 °C min. / +30 °C max.
Substrate moisture content
Can be installed on substrates with higher moisture content. No ponding water. Check rising moisture. The substrate needs to be visibly dry and have adequate pull-off strength min 1.5 N/mm2.
Pot Life
| Temperature | Time |
| +10 °C | ~35 - 40 min |
| +20 °C | ~22 - 25 min |
| +30 °C | ~15 - 18 min |
| +35 °C | ~12 - 15 min |
Curing time
Before overcoating Sikafloor® -20 PurCem® allow:
| Substrate temperature | Minimum | Maximum |
| +10 °C | 24 h | 72 h |
| +20 °C | 24 h | 48 h |
| +30 °C | 12 h | 24 h |
| +40 °C | 12 h | 24 h |
Times are approximate and will be affected be changing ambient and substrate conditions, particularly temperature and relative humidity.
If used other primers than Scratch Coat refer the Technical Data Sheet of the respective product. Make sure that the primer and the scratch coat layer is fully cured before application of Sikafloor® PurCem® previous layer.
Consumption
~2.10 kg/m2/mm
Consumptions are theoretical and do not include any wastage, additional material need due to porosity, substrate profile etc.
MIXING
Homogenise Part A with a low speed electric stirrer and then add Part B and premix Part A and B separately for 30 seconds. Make sure all pigment is uniformly distributed.
For the colourpack version, homogenise Part A neutral with a low speed electric stirrer and add Part D to it. Mix until a uniform colour is achieved. Add Part B and mix A neutral, D and B separately for 30 seconds. Make sure all pigment is uniformly distributed.
Start the pan mixer and gradually add Part C (aggregate) to the mixed resin parts over a period of 15 seconds. Allow Part C to blend for further 2 minutes minimum, to ensure complete mixing and a uniform mix is obtained. During the operations, scrape down the sides and bottom of the container with a flat or straight edge trowel at least once (Parts A + B + C or A neutral + B + C + D) to ensure complete mixing. Mix full units only.
Mixing Tools
Refer to the Sikafloor® - PurCem® method statement
APPLICATION
Prior to application, confirm substrate moisture content, relative humidity and dew point. Sikafloor®-20 PurCem® (AE) can be applied using a flat, round edge steel trowel. A short pile roller can be used once or twice, and always in the same direction, to provide a more homogeneous finish to the surface. For further details please refer to the related system data sheet and method statement.
CLEANING OF EQUIPMENT
Clean all tools and application equipment with Thinner C immediately after use. Hardened / cured material can only be mechanically removed.