Sika Sikafloor 21 PurCem

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)

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

Application

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.

MIXING

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. 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 a 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.

IMPORTANT NOTICE: From 24th August 2023, adequate training is required before industrial or professional use of this product. Training can be accessed at: https://www.safeusediisocyanates.eu