ISOMAT-PUA 1240 is a two-component, solvent-free, highly reactive, ultra fast-curing, hot sprayed-applied, hybrid polyurea membrane. ISOMAT-PUA 1240 is a 100% solids waterproofing membrane obtained from the reaction of an aromatic, isocyanate prepolymer with a blend of amine-polyol resin. Thanks to its special composition, the reaction takes place within seconds and the final product delivers excellent mechanical strength and chemical resistance to any kind of substrate. It is applied with a special high-pressure and high-temperature spray gun, offering the following advantages:

• Forms a jointless, seamless surface.
• Excellent physical-mechanical properties: ultimate tensile stress, crack-bridging ability, abrasion resistance, high time in seconds.
• Rapid reaction; gel time in seconds.
• The waterproofed area can be returned to service immediately. Pedestrian use may begin within minutes after application.
• ~100% solids and odorless or nearly odorless.
• Thanks to its fast-curing time, it may be safely applied to vertical surfaces, too.
• Good adhesion to almost any substrate.

ISOMAT-PUA 1240 has been successfully tested by a third-party laboratory for resistance to root penetration, according to CEN/TS 14416:2014.
ISOMAT-PUA 1240 is used in a large number of waterproofing applications, especially where high mechanical and chemical resistance and fast work are required. ISOMAT-PUA 1240 is ideal for waterproofing:

• roofs, balconies and terraces
• inverted and green roofs,
• metal roofs,
• metal or concrete bridges,
• stadiums and arenas.

Substrate preparation
Polyurea may be applied on most substrates using a suitable primer, following appropriate preparation. The substrate must be resistant, dry(moisture content < 4%) and free from loose material, dust, oil and other contaminants.

1.1. Concrete surfaces
Cavities in the concrete must be filled with proper repair materials. Deep cracks in the substrate must be sealedwith one of the polyurethane sealants FLEX PU-30 S/50 S. After the surface is properly prepared, it is primed with the one-component polyurethane primer PRIMER-PU 100 (or the two-component polyurethane PRIMER-PU 140 if humidity is between 4% and 6%). The primer should be applied continuously over the entire surface using a brush, roller or spray gun, with a consumption of approx. 200 g/m2. ISOMAT-PUA 1240 may be applied 2-3 hours after the application of the polyurethane primer and while the surface is still tacky. In any case, the waiting time after the application of the primer should not exceed 24 hours. Alternatively, DUROFLOOR-PSF two-component, solvent-free epoxy primer is applied using a brush or roller in one layer, with a consumption of 200-300 g/m2. After the application of DUROFLOOR-PSF and while this is still fresh, quartz sand must be broadcast. The quartz sand must be completely dry. Once the primer has cured, removeany residual quartz sand grains using a high-suction vacuum cleaner. The membrane must be applied within 24 hours from primer application.

1.2. Smooth-Non-absorbent surfaces
Smooth and non-absorbent surfaces, as well as surfaces of bituminous membranes or old waterproofing layers, after being cleaned of residue, loose material and anything that might affect adhesion, are primed with the two-component, water-based epoxy primer EPOXYPRIMER 500. The primer is diluted up to 30% with water, with a consumption of 150-200 g/m2 and uniformly applied over the entire surface using a roller, brush or spray gun.  ISOMAT-PUA 1240 may be applied within 244-48 hours from priming and as long as the moisture content of the primerfalls < 4%.

1.3. Wooden surfaces
The substrate must be resistant, dry (moisture content < 4%), and free from loose material, dust, oil, old paints and other contaminants. The joints between the panels must be treated and sealed with suitable materials. After the surface is properly prepared, it is primed with the one-component polyurethane primer PRIMER-PU 100 or the two-component polyurethane PRIMER-PU 140. The Primer should be applied uniformly over the entire surface using a brush, roller or pray gun, with a consumption of approx. 200 g/m2. ISOMAT-PUA 1240 may be applied 2-3 hours (depending on the weather conditions) after the application of the polyurethane primer and while the surface is still tacky. In any case, the waiting time after the application of the primer should not exceed 24 hours.

1.4. Metal surfaces
The substrate is prepared by brushing, rubbing, sandblasting, etc. and is then thoroughly cleaned using an industrial vacuum cleaner in order for the surface to be dry, stable and free from materials that may prevent adhesion, such as dust, loose material, oil, rust or corrosion of any type. Then, the two-component, anti-corrosion epoxy primer EPOXYCOAT-AC is applied by brush, roller or spray in two layers. The second layer may be applied as soon as the first one has dried. ISOMAT-PUA 1240 is applied within 24 hours from priming.

Application-Consumption
Components A and B are  packaged in separate cpntainers. Polyurea membrane is applied using a special high-pressure and high-temperature spray gun. Material temperature has to range between 60-65oC and pressure must be set at 140 bar. ISOMAT-PUA 1240 is sprayed after the primer has dried (depending on temperature and humidity conditions and the primer selected).