Article No. 104825

    FM MG

    Cement-lime jointing mortar, machine workable

    ≤ 1.0 mm
    Colour: special colours | 1048
    Size / Quantity

    Product specifications

    On delivery

    Compressive strength (28 d) > 5 N/mm² (M5)
    Dynamic E-modulus (28 days) > 7000 N/mm²
    External surveillance GG-CERT
    Maximum grain size Approx. 1 mm
    Open porosity Approx. 30 vol.-%
    Water requirement Approx. 19%, equivalent to approx. 4.8 l / 25 kg
    Water vapour diffusion resistance µ approx. 15

    The stated values represent typical product characteristics and are not to be construed as binding product specifications.

    Field of application

    • For use indoors and outdoors
    • First-time jointing and joint repair
    • Brick and natural stone masonry
    • Mortar joints from 5 to 30 mm


    • Machine workable
    • Good flank adhesion
    • Special colours (UV-resistant pigments) available
    • Can be made doubly hydrophobic
    • Preparation
      • Substrate requirements

        Clean, dust-free and capable of supporting a load.

      • Preparations

        Joint depth min. 2 cm or double the joint width.

        Sanded joint sides can lead to lateral detachment.

    • Application
      • Application temperature: min. 5 °C max. 30 °C
      • Caulking gun / Jointing iron
      • Pre-wet the open, cleaned joint.

        Using a suitable feed pump, apply fresh mortar to the joint, press it in and level it off, but do not iron.

        After application, work with a profiling tool (e.g. tubing).

        Only mix as much mortar as can be used within approx. 2 hours.

    • Application instructions
      • Once it has hardened, mortar must not be made workable again by adding either water or more wet mortar.

        The type and duration of the reworking and surface treatment will influence the colour.

        Slight deviations in colour between different batches are possible.

        Protect wet mortar surfaces against frost, rain and drying out too quickly for at least 4 days.

        The flank adhesion can be increased by adding ZM HF [basic] to the mixing water (ratio 1:10).

        Wait at least 24 hours before applying subsequent layers.

    • Working tools / cleaning
      • Caulking gun / Jointing iron
      • Mixer, suitable feed pump, trowel, jointing iron, profiling tool (e.g. tubing)

      • Clean tools and equipment with water before the mortar sets.

    • Storage / shelf life
      • Protect form moisture
      • Shelf-life 12 months
      • If stored in an unopened container and in a dry place, the product will keep for approx. 12 months.

    • Usage
      • Approx 1.6 kg / l void
      • Approx. 1.6 kg/l void

      • Apply to a large enough trial area to determine the precise amount required.

    • General information
      • May contain traces of pyrite (iron sulphide).

        Do not use on gypsum-based substrates.

        The characteristic data of the product were calculated under laboratory conditions at 20°C and 65% relative humidity.

        Low chromate content in accordance with Directive 2003/53/EC.

        The mixing water must be of drinking water quality.

        Special colour according to colour number (MF no., colour swatches, NCS etc.) or submitted sample (in the case of changing or alternating colours, clearly mark the desired colour).

        The colour that is obtained after drying and hardening depends on the ambient conditions and the processing method. For instance, a freshly smoothed surface will be lighter than one that is smoothed later or roughened. Different grain sizes of the same product may lead to slight differences in colour. Substrates soaked from the back may cause discolouration.

        Always set up a trial area/trial areas first.

        Alkaline binders may cause a dissolution process on non-ferrous metals.

        Deviations from applicable regulations must be agreed separately.

        The relevant test certificates must be observed when planning and carrying out work.

    • Disposal instructions
      • Larger quantities of leftover product should be disposed of in the original containers in accordance with the applicable regulations. Completely empty, clean containers should be recycled. Do not dispose of together with household waste. Do not allow to enter the sewage system. Do not empty into drains.

    • Safety / regulations
      • For further information on the safety aspects of transporting, storing and handling the product and on disposal and environmental matters, please see the current Safety Data Sheet.