Technical Leaflet Directions for use FLEX PU-40 is a one-component, solvent-free polyurethane adhesive sealing mastic, providing: • Resistance to temperatures ranging from -40oC to +80oC. • Excellent bonding to any kind of building material. • High elasticity. • Great endurance to aging and weather. • Dyeability after hardening, only with water-soluble paints. FLEX PU-40 is suitable for sealing vertical and horizontal joints, on various materials like concrete, aluminium, steel, wood, glass, natural and artificial stones etc., both indoors and outdoors. Also suitable for bonding these materials. In case of grouting on natural or artificial stones, such as marble and granite, please contact ISOMAT’s Technical Support Department. 1. Substrate preparation Substrate must be dry and free of dust, loose particles, grease etc. It is recommended that the joint is cleaned up by using a paintbrush or a wire brush and then air-blasted. To avoid undesirable soiling at joint edges, a self-adhesive paper-tape is applied alongside the edges and then removed immediately after sealing the joint (before a film is formed). 2. Application The cartridge is inserted in the special gun and the nozzle is cut slantwise, so that it does not fit into the joint but barely touches and slides along the edges. FLEX PU-40 is applied by moving the cartridge along the joint axis at a 450 angle. While still fresh, the mastic is leveled with a trowel. Cleaning of tools: Tools must be thoroughly cleaned with common solvents, while material is still fresh. If material has hardened, tools may only be mechanically cleaned. Consumption Base: Colors: Application temperature: Film formation: polyurethane white, grey, brown from +50C to +350C * 50-55 min • Joint 10mm x 10mm: 1 cartridge / 3 m of joint length. • Joint 5mm x 5mm: 1 cartridge / 12 m of joint length. Curing speed: > 3.5 mm/day Hardness according to SHORE A (DIN 53505): * 45 Elastic modulus at 100% elongation (DIN 52455): 1.0 ± 0.1 N/mm2 Packaging • Cartridges of 310 ml. • Sausages of 600 ml. Shelf-life - Storage Elongation at break (DIN 53504): > 450% Shelf-life is 12 months, in dry and frost-free conditions. The technical information and instructions supplied in this datasheet are based on the knowledge and experience of the department of Research and Development of our company and on results from long-term applications of the product in practice. The recommendations and suggestions referring to the use of the product are provided without guarantee, since site conditions during the applications are beyond the control of our company. Therefore the user is responsible for confirming that the chosen product is suitable for the envisaged application. The present edition of this technical data sheet automatically cancels any previous one concerning the same product.