ResDev Pumadur RT

ResDev Pumadur RT is a resin-rich heavy duty, trowel applied polyurethane floor screed for use on concrete and polymer modified cementitious screeds. Suitable for steam cleaning or application onto freezer floors down to -40°C.

Best Uses

Pumadur RT is designed with the highest order of durability, impact, abrasion and chemical resistance. Its lightly textured finish makes the product ideal for both wet and dry processing environments such as the food, beverage and chemical industries.

Provides a seamless, matt surface with a light slip resistant texture. Pumadur RT contains a white aggregate which imparts a slip resistant profile to the finished floor. When first installed, the floor has a uniform coloured surface. However, with general use, the white aggregate will begin to show through giving a decorative, mottled appearance.

• Resin rich - easier and quicker to apply than stiffer screeds
• Stable to steam cleaning and hot water exposure at a thickness of 9 mm
• Very high chemical resistance
• Non-tainting
• Seamless
• High abrasion resistance
• Slip resistant

Pumadur RT is resistant to a wide range of commonly used chemicals in the food, dairy and pharmaceutical industries such as concentrated citric acid (fruits), spirit vinegar (50% acetic acid), lactic acid (food & dairy products) and common alcohols (methanol & ethanol). Pumadur RT is also resistant to a wide range of inorganic acids, fuels, hydraulic oils, mineral oils and solvents. Good housekeeping practices should be employed.

Pumadur RT is resistant to spillages and discharges up to 70°C when applied at 6 mm thickness. When applied at 9 mm Pumadur HF is resistant to spillages and discharges up to 120°C and is fully steam cleanable. Where thermal shock is an issue, a good quality substrate is essential. A 6mm Pumadur RT is suitable for freezer temperatures
down to -25°C. A 9mm Pumadur RT is suitable for freezer temperatures down to -40°. In extreme thermal shock environments, a well-designed substrate of good quality concrete is essential.

The product must be fully cured before the freezer is activated, and the temperature must not be reduced at a blast chill rate; preferably over a minimum 24-hour period.

Application

Inadequate preparation will lead to loss of adhesion and failure. Grinding, light vacuum-contained shot-blasting or planing is recommended. Percussive scabbling or acid etching is not recommended. Anchorage grooves should be cut to a width and depth of twice the thickness of the floor finish at the edges, bay joints, upstands, drains, doorways and at regular points across the floor, and all debris removed.

Priming
(i) Where the concrete substrate has a relative humidity of <75%, priming should be carried out using ResDev Pumaprime SF or ResDev Pumaprime DPM taking particular care to prime but not fill the anchor grooves (see separate data sheet). Spread onto the substrate and roll with a short-haired roller to ensure even coverage until the surface is completely wetted out, taking care to avoid pooling. Apply around the edges of and into anchorage grooves by brush, to allow even spreading and avoid pooling. If, when cured, there are dry patches, a further primer coat is required. Allow to cure for a minimum 12 hours at 20ºC. If the primer has been left to cure for >48 hours then
the primer surface should be mechanically abraded and the area re-primed. Failure to do so may result in pinholing of the surface topping.

(ii) Where the concrete substrate has a relative humidity of >75%, Pumadur RT can be applied to 7 day old concrete which is visibly dry and having a minimum tensile strength (pull-off) of 1.5 MPa. All of the usual stringent surface preparation techniques should be employed. For concrete bases in contact with the ground, a damp proof membrane should have been incorporated into the slab design, in accordance with the requirements of CP102 (Code of Practice for Protection of Buildings Against Water from the Ground).

ResDev Pumadur TF should be applied as a primer coat. Apply using a medium nap roller directly from a paint tray or scuttle. Push the coating well into the surface, make sure it is fully wetted out then pull back to a tight coat with the roller. Apply around the edges of and into anchorage grooves by brush, to allow even spreading and avoid pooling. If, when cured, there are dry patches, a further primer coat is required. Allow to cure for a minimum 12 hours at 20ºC. If the primer has been left to cure for >48 hours then the primer surface should be mechanically abraded and the area re-primed. Failure to do so may result in pin-holing of the surface topping.

Prior to mixing, the temperature of the three components must be between 15 and 25°C. Pre-mix the coloured resin component before use. Add the hardener component to the coloured resin component and mix using a low speed electric mixer (300 - 400 rpm) for 1 - 2 minutes until homogeneous. Decant the mixture into a rotary drum mixer and add the aggregate component in stages, mixing for a minimum of 3 minutes until a uniform coloured, lump-free mix is obtained. Apply to primed areas to the required thickness using a steel float. Ensure that anchor grooves are fully wetted out with material. The cured product should be protected from other trades using Kraft paper or similar breathable material. Polythene should not be used.

Protect the installed floor from damp, condensation and water for at least 4 days.

Note: Due to the high resin content, ‘back-rolling’ of Pumadur RT can lead to an increased risk of pin-holing and texture in the surface.