Sikafloor®-21 PurCem®

• Conformity with LEED v4 MRc 2 (Option 1): Building Product Disclosure and Optimization – Environmental Product Declarations
• Conformity with LEED v4 MRc 4 (Option 2): Building Product Disclosure and Optimization - Material Ingredients
• Conformity with LEED v2009 IEQc 4.2: Low-Emitting Materials - Paints and Coatings
• Complies AgBB for use in in indoor environment. Test report No. G10004B.

• Synthetic resin screed material according to 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-marking
• Coating for surface protection of concrete according to EN 1504-2:2004, Declaration of Performance 02 08 02 02 001 0 000002 1088, certified by Factory Production Control Body, 0086, certificate 541325, and provided with the CE-marking
• 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 PurCem® 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.

Water-based polyurethane cement hybrid

Original, unopened and undamaged sealed packaging, in dry conditions at temperature between +5 C° and +30 °C.

Part A (pre-tinted)+B+C mixed: ~ 1.93 kg/l ± 0.03 (at +20 °C)

Part A (neutral)+B+C+D mixed: ~ 1.93 kg/l ± 0.03 (at +20 °C)

Mix full units only.

Scratch coat: 1–2 mm
Base- and wear coat: 3–6 mm

+10 °C min. / +40 °C max.

85 % max.

Beware of condensation!
The substrate and uncured floor must be at least 3 °C above dew point to reduce the risk of condensation or other disturbance of the surface on the floor finish.

+10 °C min. / +40 ºC

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.

Before overcoating Sikafloor®-21 PurCem® allow:

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.

Sikafloor PurCem Accelerator dosage for faster turn around and colder temperature applications;
Sikafloor®-21 PurCem® Addition rate to approx halve the above waiting times - 15 mls. Addition at approx 6 degrees C. It is not recomended to exceed - 25-30 mls of PurCem Accelerator per kit.

~ 1.93 kg/m²/mm

Premix part A with a low speed electric stirrer and then add part B and mix for 30 seconds. For the colourpack version, premix 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 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, (if required add PurCem accelerator and mix for a further 1 minute, 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.

Broadcast Applications: For best results and long-term performance Sikafloor 21 Base coat should be applied with the addition of PurCem pigment, however can be installed without pigment if the client and applicator have no objection to the potential of visible colour difference with deep scratches or damage to the surface, no noticeable difference in application is evident when used without the addition of pigment. 

Smooth Applications: Scratch Coat priming is required: Sikafloor 21 PurCem must be installed with the addition of Sikafloor PurCem Pigment for smooth applications

Apply Sika floor 21 PurCem Evenly at the prescribed thickness without any ridges when joining previous mixes by spreading the new mix and introducing it into the edges of the previous.

Spike roll the product to release any air entrained by mixing and to assist in a final even out of the surface.

Time the application of the broadcast aggregate whilst the base can still receive it. This is generally between 2-5 minutes post installation of the base. - Depending on ambient and substrate temps.

Take care to remove as much of the broadcast aggregate as possible before overcoating.   Excess loose aggregate on the floor when applying finish coats will result in uneven texture and colour shading across the finished floor.

Application of the Sikafloor 31 or 33 PurCem finish coats must be carried out using the correct rolling equipment (See Equipment above).

Product must be applied evenly, and wet edges joined promptly.  Squeegee application of the coating then "laying off" with the roller is a recommended way of achieving an even result.  Cross "laying off" assists this further.

Failure to adhere to these methods will likely produce uneven textures and colour in the finished product.

Clean all tools and application equipment with Thinner C immediately after use. Hardened / cured material can only be mechanically removed.