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Syntech Flexipur Mono

Liquid, single-component, waterproofing polyurethane membrane

Single-component coating based on polyurethane resins, for the coating, waterproofing and elastic protection of roofs, terraces, stairs, bridges and surfaces that are cracked or subject to micro-cracks and crazing. Can also be used as a waterproofing under tiles.
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    Obtained Certifications and Regulations
    EN 1504-2
    Lines of belonging
    Linea prodotto Aqua
    Linea prodotto Floor
    Linea prodotto Infratech
    Features and benefits
    Where it is used
    How to use
    Technical data
    Additional content
    Warnings and precautions
    Related products

    Syntech Flexipur Mono

    • High resistance to abrasion and atmospheric agents
    • Applicable on tarred surfaces and bituminous sheaths
    • Walkable product suitable for covering and waterproofing flat roofs
    • Ease and speed of application with quick intervention times
    • It does not require fractionation joints
    • Elastic product resistant to dynamic stress with high crack bridging capacity
    • Vapor permeable product

    Fields of application
    • Waterproof coating of concrete, ceramic, porcelain stoneware, tarred substrates and bituminous sheaths, suitably prepared
    • Creation of elastic and waterproof protections for roofs and large surfaces even with complex geometries
    • Ideal for waterproofing cycles of balconies, roofs and terraces as it does not require preliminary demolition work or replacement of coverings
    • It allows you to create a continuous, elastic and waterproof layer that is resistant even to low temperatures
    • Waterproof membrane for new structures or for the restoration of existing ones
    • Waterproofing under tiles glued on terraces and balconies

    Allowed supports
    Bitumen waterproofing membranes
    Floor screed
    Porous stone
    Preparation of supports

    The surfaces to be coated must be stable, clean and free of substances that can affect the adhesion of the coating. In case of restoration, first use mortars and products from the FLOOR line or the REPAR line suitable for the purpose. Wait for the drying times before applying the next coating. The tensile strength of the support must not be less than 1.5 N/mm². The concrete surfaces must be previously prepared by dry sanding with diamond tools, shot peening with closed cycle machines or closed cycle milling, depending on the degree of contamination of the support and the thickness of the final coating. Any existing paintwork, coatings or paints, residues of cement laitance, release agents, greases, silicones, etc. they can be removed mechanically by sanding with a single-brush sander, sandblasting, hydro-sandblasting or chemical removal, treating the support with Deterg A (diluted in water 1:10) left to act until the reaction is complete, then rinsing thoroughly with water.

    Cracks and fissures
    In the case of static cracks, for sealing use mortars from the FLOOR line, or epoxy products such as Syntech Primer EP-W or Syntech AS 21. The sealing of dynamic cracks or cracks larger than > 4-5 mm must be evaluated on site. They can generally be grouted using elastomeric materials or worked as movement joints.

    Localized grouting and restoration
    Any holes, deficiencies, repairs of portions of concrete can be carried out by applying our mortars from the FLOOR line or the REPAR line. Any small filling of holes and gaps can be carried out by applying Syntech AS 21 epoxy mortar.

    Tarred surfaces or with bituminous sheaths
    The surfaces to be coated must be oxidized, stable, clean and free of substances that can affect the adhesion of the coating. Eliminate any bubbles and deformations present in the existing bituminous sheaths and all weak and inconsistent parts. Eliminate any residue or puddles of water resulting from previous processing, washing or meteorological events and dry the support.

    Ceramics, tiles, stoneware
    The surfaces to be coated must be stable, clean and free of substances that can affect the adhesion of the coating such as dirt, grease, oil, etc. Prepare the support by mechanical sanding with diamond discs and dust extraction or shot peening.

    Mode of use

    Before installing resin waterproofing systems and coatings, always check the residual humidity content. Check for the presence of residual humidity using the plastic sheet method according to the ASTM D 4263 standard: fix a heavy polyethylene sheet with a size of at least 45x45 cm to the support with adhesive tape. 24 hours after its installation, lift the sheet and check for signs of humidity. If testing with a carbide hygrometer, the moisture content of the substrate must be < 4% by weight.

    Application temperature: minimum +5°C _ maximum +35°C

    Relative humidity of the environment: maximum 80%
    The support must have a temperature at least +3°C higher than the dew point to reduce the risk of condensation or bleaching of the finish.

    Thoroughly homogenize the product by manually shaking the container before use or mechanically, taking care to use a clean tool free of potentially polluting substances. The product can be applied by brush, roller or airless spray. If necessary, for spray applications, it is possible to dilute the product with Syntech Polyurethane Thinner at a rate of 5-8% max by weight.
    Apply two or more coats of Syntech Flexipur Mono, taking care to respect the indicated consumption and thickness. Wait at least 8 hours, then apply the next coat of product. In order to guarantee an adequate thickness of the waterproofing system, it is recommended to insert the Arma TNT non-woven fabric during the application phase, taking care to cover it completely with the waterproofing so as to increase the resistance to the stresses and cracks to which the waterproofing system is subjected. Apply the Syntech Flexipur Mono waterproofing product to the area to be treated, then lay Arma TNT, compressing it with a metal bubble-breaking roller, a trowel or a smooth spatula, checking that the non-woven fabric is completely embedded in the membrane and ensuring perfect wetting. Wait for the first layer of applied product to dry completely, then proceed with the application of the second uniform coat to completely cover the non-woven fabric. The overlaps of the fabric at the connection points in the longitudinal and transversal direction must be carried out by making an overlap between the sheets of no less than 5 cm. In case of rain between the application of the first and second coat, let the non-woven fabric dry completely before applying the second layer. ELASTOTEX elastic straps can be used advantageously in the overlaps between the wall and the floor or in critical points.

    Protective painting
    If you want to further increase resistance to UV rays, we recommend applying a coat of white or colored Syntech Flexipur elastic polyurethane finish to the waterproofing product.

    Waterproofing under tiles
    On the adequately prepared support, apply a coat of Syntech Primer EP-S with a brush or medium-haired roller as a bonding primer, taking care to saturate the entire surface to be treated. On the still fresh primer, at the end of the application, proceed with a sowing of Quartz 0.1-0.5 until the surface is saturated. Wait for the primer to harden then remove the sand by vacuuming the excess parts. Then apply two coats of Syntech Flexipur Mono waterproofing. Once hardened, the covering is suitable for gluing tiles using a two-component cementitious matrix adhesive, Osmokoll, CE certified according to class C2TES1.

    Application methods
    Paint roller
    Tool cleaning
    Syntech Diluente Poliuretanico
    Key features
    Density: 1.59 ± 0.05 kg/l
    Shelf-life: 12 months
    Temperature of use
    Temperature of use: +5 / +35 °C
    To be applied in two coats
    To be applied in two coats
    Use wearing protective glasses
    Use wearing protective glasses
    Use wearing protective gloves
    Use wearing protective gloves
    Technical specifications

    Adhesion by direct traction
    EN 1542

    ≥ 4.0 N/mm²

    Shore A EN ISO 868

    > 60

    Impact resistance
    EN ISO 6272-1

    Class I > 4 N/m

    < 500 g/l

    Brookfield ASTM D 2196

    7500 ± 1500 mPas

    EN 1062-7


    Capillary absorption
    EN 1062-3

    w < 0.1

    Working temperature

    -40 / +80 °C

    Dynamic crack bridging
    EN 1062-7

    > B4.1

    EN 14891

    > 0.5 N/mm²

    Longitudinal elongation at break
    EN 12311-2

    > 400 %

    Durability - Tensile adhesion after immersion in water
    EN 14891

    > 0.5 N/mm²

    Permeability to water vapor
    EN ISO 7783-1

    Classe I Sd < 5 m

    Complete hardening at 20°C

    10 day

    Permeability to CO2
    EN 1062-6

    Sd > 50 m

    Time before second coat at 20°C

    12 h

    Heat resistance

    70 °C

    Resistance to severe chemical attacks
    EN 13529

    See Table

    Touch hardening at 20°C

    8-9 h

    Approximately 1 kg/m2 of Syntech Flexipur Mono for each coat (apply two coats).

    Available colors
    Packaging and dimensions
    Can 25 kg
    Storage and conservation
    Protect from freezing.
    Additional content

    Workability time
    60' at 20°C

    T.+15 °C  ~ 72 h
    T.+20 °C  ~ 48 h
    T.+30 °C  ~ 48 h
    The times shown in the Workability Times, Waiting Times and Commissioning Times are intended to be approximate and may vary depending on the conditions of the support and the installation environment.


    • Since it is a hygrohardening product, the speed of hardening is strongly influenced by the relative humidity in the environment

    • Do not apply on supports with rising damp

    • The product is not suitable for permanent immersion in water

    • To avoid the formation of unsightly air bubbles, carry out the application with decreasing ambient and substrate temperatures

    • Do not apply on surfaces that are not adequately prepared

    • Do not apply on dusty, weak, unstable and poorly cohesive supports

    • Protect the product from water and atmospheric agents for the first 24 hours after its application

    • Respect the consumption and over-application times indicated

    • Do not dilute the product with water

    • The use of unsuitable thinners different from those indicated can create problems for the product both of an aesthetic nature (color change, sedimentation of the product, variation in the degree of brightness, formation of surface hazes, etc.) and in terms of technical performance . The use of the wrong thinners can also create problems during the application phase. AZICHEM srl therefore does not guarantee any product performance if its dilution is carried out with unsuitable products or products other than those indicated.

    The general information, along with any instructions and recommendations for use of this product, including in this data sheet and eventually provided verbally or in writing, correspond to the present state of our scientific and practical knowledge.
    Any technical and performance data reported is the result of laboratory tests conducted in a controlled environment and thus may be subject to modification in relation to the actual conditions of implementation.

    Azichem Srl does not assume any liability arising from inadequate characteristics related to improper use of the product or connected to defects arising from factors or elements unrelated to the quality of the product, including improper storage.
    Those wishing to utilise the product are required to determine prior to use whether or not the same is suitable for the intended use, assuming all consequent responsibility.

    The technical and characteristic details contained in this data sheet shall be updated periodically. For consultation in real time, please visit the website: The date of revision is indicated in the space to the side. The current edition cancels out and replaces any previous version.

    Please note that the user is required to read the latest Safety Data Sheet for this product, containing chemical-physical and toxicological data, risk phrases and other information regarding the safe transport, use and disposal of the product and its packaging. For consultation, please visit:
    It is forbidden to dispose of the product and/or packaging in the environment.
    Technical Documentation

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