ISOFLEX-PAS 660 is a two-component, aliphatic, cold-applied polyurea (polyaspartic) waterproofing membrane:

• Based on elastomeric, hydrophobic, polyaspartic resins, featuring thus excellent mechanical, chemical, thermal, UV and weather resistance properties.
• Forms a continuous, elastic, waterproof and vapor-permeable membrane, without seams or joints.
• Provides excellent adhesion to various substrates, including concrete, cement screed, wood and most waterproofing membranes.
• Applicable even to irregular substrates.
• Does not turn yellow, meaning it is color-stable and does not require any additional coating.

Certified according to EN 1504-02 and classified as a coating for surface protection of concrete. CE marked. ISOFLEX-PAS 660 is ideal for waterproofing:

• flat roofs and balconies, as an exposed waterproofing membrane
• under tile layers in kitchens, bathrooms, balconies and flat roofs, as long as quartz sand has been broadcast on its last layer.
• under thermal insulation boards on flat roofs
• in open parking deck systems
• gypsum and cement boards
• old layers of bituminous membranes
• polyurethane foam
• metal surfaces

It can also be applied asa protective topcoat over aromatic hot spray-applied polyurea.

Substrate preparation
In general, the substrate must be dry (moisture content <4%) and free of grease, loose particles, dust, etc.

Application-Consumption
Components A (resin) and B (hardener) are packaged in two separate containers, at the correct predetermined mixing ratio by weight. At first, component A should be mixed. Then, all of component B is added to component A and the two components are mixed for about 3 minutes with a low speed mixer (300 rpm). It is important to stir the mixture thoroughly near the walls and bottom of the container to achieve uniform dispersion of the hardener.

a) Full-surface waterproofing
ISOFLEX-PAS 660 is applied by brush or roller in two layers. The second layer should be applied crosswise after 8-24 hours,depending on the weather conditions. In areas of intense cracking, it is recommended to locally reinforce ISOFLEX-PAS 660 with a 10 cm wide polyester fleece strip is embedded lengthwise. Then, two extra layers of ISOFLEX-PAS 660 are applied over the entire surface. In case there are dens, multiple cracks all over the surface, it is strongly recommended that ISOFLEX-PAS 660 membrane be fully reinforced with 100 cm wide strips of polyester fleece (60 g/m2). These placed strips must overlap by 5-10 cm. In that case, after priming, the first layer of ISOFLEX-PAS 660 is applied and, while still fresh, a strip of polyester fleece (100 cm wide) is followed in the remaining surface. Then, two extra layers of ISOFLEX-PAS 660 are applied on the entire surface. Consumption: 2.0-2.25 kg/m2,depending on substrate type.

b) Local waterproofing of cracks
in this case, the primer is applied onthe substrate only along the cracks, to width of 10-12 cm. After priming, the first ISOFLEX-PAS 660 layer is applied and, while still fresh, a 10 cm wide polyester fleece strip (60 g/m1) is embedded lengthwise. Two extra ISOFLEX-PAS 660 layers are applied along the cracks, completely covering the reinforcement. 

c) Waterproofing under tiles
ISOFLEX-PAS 660 is applied by brush or roller in two layers. ISOFLEX-PAS 660 should be locally reinforced along joints and wall-floor junctions by embedding a 10 cm wide polyester fleece strip (60g/m2) on its first layer, while still fresh. Then, two extra ISOFLEX-PAS 660 layers are applied along the cracks, completely covering the reinforcement. After applying the final layer and while this is still fresh, quartz sand with particle size 0.3-0.8 mm must be broadcast. The quartz sand must be completely dry. After 24 hours, any loose grains should be removed with a high suction vacuum cleaner. Tiles should be fixed with a high performance, polymer-modified tile adhesive such as ISOMAT AK-22, ISOMAT AK-23 XXL, ISOMAT AK-25, ISOMAT AK-ELASTIC and ISOMAT AK-MEGARAPID.