Sikafloor®-20 PurCem®
Sikafloor®-20 PurCem® is a multi-component, water-based coloured polyurethane hybrid flooring screed. It has flat, high abrasion, chemical, impact and slip resistant surface. It is typically installed at 6 – 9 mm.
- Very good chemical resistance
- Excellent mechanical resistance
- High glass transition point
- Non tainting /odourless
- VOC free and environmental friendly
- Can be applied to substrates with high moisture content (7 days old and a minimum 25N/mm2 compressive strength or mature damp concrete)
Usage
Sikafloor®-20 PurCem® 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.Advantages
- Very good chemical resistance
- Excellent mechanical resistance
- High glass transition point
- Non tainting /odourless
- VOC free and environmental friendly
- Can be applied to substrates with high moisture content (7 days old and a minimum 25N/mm2 compressive strength or mature damp concrete)
Packaging
Part A (pre-tinted) | 3.00 kg plastic pail |
Part A (neutral) | 2.5 kg plastic pail |
Part B | 3.00 kg plastic jerrycan |
Part C | 26.50 kg plastic lined, double paper bags |
Part D | 0.500 kg plastic pouch for substrate A neutral |
Part A (pre-tinted)+B+C: 32.5 kg ready to mix units
Part A (neutral)+B+C+D: 32.5 kg ready to mix units
Colour
Part A (pre-tinted) | coloured liquid |
Part A (neutral) | light beige liquid |
Part B | brown liquid |
Part C | natural grey powder |
Part D | colourpack as per list below for part A neutral |
Standard colours: Agate Grey, Beige, Dusty Grey, Yellow Green , Golden Yellow, Carmine Red, Pebble Grey, Ultramarine Blue
Product Details
ENVIRONMENTAL INFORMATION
LEED Rating
Confirms Section FQ (Indoor Environment Quality), Credit 4.2 Low Emitting Materials Paints and Coatings (VOC content ≤ 50 g/l). Complies to AgBB for use in indoor environment. Test report Nr. 392-2014-00087003A_03.
APPROVALS / STANDARDS
- Polyurethane screed for concrete protection according to the requirements of EN 1504-2:2004 and conforms to the requirements of EN 13813: 2002, DoP 02 08 02 02 001 0 000001 1088, certified by Factory Production Control Body, 0086, certificate 541325, and provided with the CE-mark.
- EN1186, EN 13130, and prCEN/TS 14234 standards, and the Decree on Consumer Goods, representing the conversion of directives 89/109/EEC, 90/128/EEC and 2002/72/EC for contact with food stuffs, according to test report by ISEGA, 32758 U11 and 32759 U11, both dated December 6th, 2011. (Tests performed on Sikafloor® -20/21/22/29 and 31 PurCem® in standard and LP versions).
- British Standards Specifications (BSS) acceptance for use in the UK.
- Campden and Chorleywood Food Research Association, Ref. S/REP/125424/1a and 2a, dated 8th February, 2012.
- Fire classification report according to EN 13501-1 from Exova Warrington Fire for Sikafloor®-20 PurCem® No.317045, dated 24th of March, 2012.
- Liquid water transmission rate test report from the Technology Centre, Ref. 15456 dated January 25th, 2012.
- Abrasion resistance tests performed by Face Consultants Ltd., according to BS 8204-2:2003, report ref. FC/12/3850, dated January 17th, 2012 (tests performed on Sikafloor® -20/21 PurCem®).
- Impact resistance values tested at PRA, Ref. nº 75221-151a, dated February 15th, 2012.
- Thermal expansion coefficient and freeze-thaw cycle resistance performed at RWTH / IBAC, report nº M-1614 dated May 29th, 2012.
Chemical Base
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 | 24 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.
Density
Part A (pre-tinted)+B+C mixed: ~ 2.08 kg/l ± 0.03 (at +20°C)
Part A (neutral)+B+C+D mixed: ~ 2.08 kg/l ± 0.03 (at +20°C)
Compressive Strength
> 50 N/mm2 after 28 days at +23°C / 50% r.h. | (BS EN 13892-2) |
Flexural Strength
> 10 N/mm2 after 28 days at +23°C / 50% r.h. | (BS EN 13892-2) |
Tensile adhesion strength
concrete failure | (EN 1542) |
Application
Mixing Ratio
- Part A (pre-tinted) : B : C = 1 : 1 : 8.83 (packaging size = 3.0 : 3.0 : 26.5) by weight
- Part A (neutral) : B : C : D = 0.83 : 1 : 8.83 : 0.17 (packaging size = 2.5 : 3.0 : 26.5 : 0.5) by weight
Mix full units only.
Layer Thickness
Wear coat 6 – 9 mm
Ambient Air Temperature
+10°C min. / +40°C max.
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. / +40ºC
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
Temperatures | Time |
+10°C | ~ 35 - 40 minutes |
+20°C | ~ 22 - 25 minutes |
+30°C | ~ 15 - 18 minutes |
+35°C | ~ 12 - 15 minutes |
Curing Time
Before overcoating Sikafloor® -20 PurCem® allow:
Substrate temperature | Minimum | Maximum |
+10°C | 24 hours | 72 hours |
+20°C | 24 hours | 48 hours |
+30°C | 12 hours | 24 hours |
+35°C | 12 hours | 24 hours |
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
~ 2.1 kg/m2/mm
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 Aneutral+B+C+D) to ensure complete mixing. Mix full units only.
Mixing Tools
Use a low speed electric stirrer (300 - 400 rpm) for mixing parts A and B. For preparation of the mortar mix use a double paddle mixer.
APPLICATION
Prior to application, confirm substrate moisture content, relative humidity and dew point. Sikafloor®-20 PurCem® can be applied using a flat, round edge steel trowel. Where the maximum slip resistance value is required, do not backroll the surface of the wet product. Should a more even homogenous finish be required, 1-2 passes with a short or medium pile roller in the same direction, using the weight of the roller only, will remove trowel marks and reduce the profile and slip resistance value. Excessive rolling will create a light textured, smooth finish.
CLEANING OF TOOLS
Clean all tools and application equipment with Thinner C immediately after use. Hardened / cured material can only be mechanically removed.