Technical Datasheet ISOFLEX-PU 540 is a one-component, polyurethane liquid waterproofing membrane. • Based on pure elastomeric, hydrophobic polyurethane resins, it offers high mechanical and chemical properties to the product. • Forms a continuous, elastic, waterproof, vapor-permeable layer, without seams or joints. • Has excellent bonding to various substrates, such as concrete, cement screeds and most waterproofing layers. • Applicable even to irregular substrates. ISOFLEX-PU 540 is suitable for waterproofing: • Wet areas (under tile) in bathrooms, kitchens, balconies, auxiliary rooms, etc., as long as quartz sand has been previously broadcast on its last layer. • Under thermal insulation boards on flat roofs. • Foundations. 1. Liquid properties Form: polyurethane prepolymer Colors: Black, grey (at +23 °C) 2. Membrane properties Elongation at break: > 400% (EN-ISO 527) Tensile strength: > 3 N/mm2 (EN-ISO 527) Hardness according to SHORE A: 78-83 1. Substrate preparation In general, the substrate must be dry (moisture content < 4%), clean, free of grease, loose particles, dust, etc. 1.1 Concrete substrates Any existing cavities in concrete should be repaired in advance. Severe cracks in the substrate must be primed locally and after 2-3 hours (depending on the weather conditions) must be sealed with the polyurethane sealants FLEX-PU 30 S or FLEX-PU 50 S. Concrete and other porous surfaces with moisture content < 4% should be treated with the primer PRIMER-PU 100, at a consumption of approx. 200 g/m2. Substrates with moisture content > 4% should be primed with the special primer PRIMER-PU 140, at a consumption of 200-300 g/m2. 1.2 Smooth and non-absorbent substrates Smooth and non-absorbent surfaces, as well as surfaces with bituminous membranes or other old waterproofing layers, must be primed with the water-based epoxy primer EPOXYPRIMER 500, thinned with water up to 30% by weight. The product is applied by brush or roller in one coat. Consumption: 150-200 g/m2. Depending on the weather conditions, ISOFLEX-PU 540 is applied within 24-48 hours from priming, as soon as moisture content falls below 4%. 2. Application - Consumption Before application, it is recommended to slightly stir ISOFLEX-PU 540 until a homogeneous mixture is formed. Extensive stirring should be avoided in order to prevent air entrapment in the material.

a) Total waterproofing of the surface ISOFLEX-PU 540 is applied by brush or roller in 2 layers. The first layer is applied 5-6 hours after priming and while PRIMER-PU 100 is still tacky. The second layer should be applied crosswise after 8-24 hours, depending on the weather conditions. Consumption: approx. 1.2-1.5 kg/m2, depending on the substrate. In case of dense, multiple cracks all over the surface, it is strongly recommended to fully reinforce ISOFLEX-PU 540 membrane with 100 cm wide strips of polyester fleece (60 g/m2). These placed strips must overlap by 5-10 cm. In that case, 5-6 hours...

Volatile Organic Compounds (VOCs) According to Directive 2004/42/CE (Annex II, table A), the maximum allowed VOC content for the product subcategory i, type SB is 500 g/l (2010) for the ready-to-use product. The ready-to-use product ISOFLEX-PU 540 contains a maximum of 500 g/l VOC. C€ _2032_ ISOMAT S.A. 17th km Thessaloniki - Ag. Athanasios P.O. BOX 1043, 570 03 Ag Athanasios, Greece 18 2032-CPR-10.11 E DoP No.: ISOFLEX-PU 540 / 1869-01 EN 1504-2 Surface protection products Coating Permeability to CO2: Sd > 50m Water vapor permeability: Class I (permeable) Capillary absorption: w < 0.1 kg/m2-h°-5 Adhesion:...