Sika Sikafloor 21 PurCem

Non Hazardous
A multi-component, water based coloured polyurethane hybrid screed with self smoothing properties.
Available in 21 Kg
From £87.13 £72.61
In stock
Only %1 left
Product Description

Sika Sikafloor 21 PurCem is a multi-component, water based coloured polyurethane hybrid screed with self smoothing properties. It has a smooth, matt, impervious, hard wearing surface and is typically installed at 3 - 6 mm thickness.

Best Uses

Sika Sikafloor 21 PurCem is used as a scratch coat primer, base coat and wear coat layer in Sikafloor®Pur-Cem® system build ups, in areas of medium to heavy loading, high chemical exposure and abrasion.

  • Good chemical resistance
  • High 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 or mature damp concrete)

Sikafloor®-21 PurCem® may only be used by experienced professionals.


The surface must be clean, dry and free of all contaminants such as dirt, oil, grease, coatings and surface treatments, etc. All dust, loose and friable material must be completely removed from all surfaces before application of the product, preferably by vacuum. Pull of strength shall not be less than 1.5 N/mm2. If in doubt apply a test area first.


Premix part A with a low speed electric stirrer and then add part B and mix for 30 seconds. For the colour pack version, premix part A neutral with a low speed electric stirrer and add part D to it. Mix until a uniform colour is achieved. Ad part B and mix for 30 seconds. Use a double paddle (axis) mixer and gradually add part C (aggregate) to the mixed resin. Allow part C to blend for further 2 minutes minimum, to ensure complete mixing and a uniform moist 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) to ensure complete mixing.

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. Prior to application, confirm substrate moisture content, relative humidity and dew point. As a scratch coat Sikafloor®-21 PurCem® can be applied using a steel trowel. As a body coat Sikafloor®-21 PurCem® can be applied using a toothed trowel or pin screed, to the desired thickness, or a steel trowel. Remove air with a spike roller. For further details please refer to the related system data sheet.

Technical Details


  • 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 000002 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®-21 Pur-Cem® No.317047, 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 75221-151, dated January 11th, 2012
  • Slip resistance properties according to DIN 51130 tested at MPI (Materialprüfung und Entwicklung), test reports refs. Nº 12-6639-S/12 and 12-6641-S/12,
    dated August 7th, 2012.
  • Thermal expansion coefficient and freeze-thaw cycle resistance performed at RWTH / IBAC, report nº M-1614 dated May 29th, 2012.


Sika Sikafloor 21 PurCem is used within the following systems:

  • Sikafloor PurCem HB-21 Gloss
  • Sikafloor PurCem HB-22
  • Sikafloor PurCem HB-22 Gloss
  • Sikafloor PurCem HB-23
  • Sikafloor PurCem HB-23 Gloss
  • Sikafloor PurCem HS-21
  • Sikafloor PurCem HS-26 Gloss

Technical Info

Components: Four Pack
Type: Water Based Screed
Stock Colours: RAL 1001, RAL 1006, RAL 3009, RAL 5015, RAL 6010, RAL 7032, RAL 7035, RAL 7037, RAL 7038
Tintable: No
VOC Content: 140 g/L
Volume Solids:
Suitable Substrates: For flooring
Application Method: Steel Trowel, Toothed Trowel, Pin Screed, Spike Roller
Theoretical Coverage: 1.93 Kg per m2 per mm
Wet Film Thickness (WFT):
Dry Film Thickness (DFT):
Induction Time: -
Pot Life: 22 - 25 minutes at 20°C
Surface Dry: See datasheet
Overcoatable: Between 24 hours and 48 hours at 20°C
Fully Cured: See datasheet
Cleaner / Thinner: Clean all tools and application equipment with Sika Thinner C immediately after use. Hardened / cured material can only be mechanically removed.
Shelf Life: Part A: 12 months, Part B: 12 months, Part C: 6 months, Part D: 24 months. Protect all from freezing.
Packaging: Available in 21 Kg

The manufacturers data sheets are available for download from this website. It is your responsibility to read and understand all aspects of the data sheets before you place an order and prior to application. Please pay special attention to the preparation, mixing and application temperatures of the product, cleaning of substrate and environmental factors such as temperature, rain etc. Quoted coverage rates are based on the manufacturers theoretical rates and may vary depending upon substrates absorption, texture and application. We always recommend a test is carried out to ensure suitability.

Customer further agrees that Promain have no liability for any errors or omissions contained within the Product Data Sheets and are not liable for failure due to misapplication or inadequate substrate cleaning and preparation. For more information please refer to our Terms & Conditions.

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