GMS-F / Mortar for masonry of aerated concrete or gas silicate blocks with antifreeze additive (grey)

  • For work at temperatures up to -10°C
  • Strength class M10
  • Excellent adhesion qualities
  • For adhesion and repair work
  • Excellent mechanical and climatic resistance
  • Grey colour


  • Blocks or bricks must be clean and dry, not iced or frozen
  • Clean the base surface from less persistent and/or separable layers
  • Especially water-absorbing bricks/blocks should be moistened
  • Mix SAKRET GMS-F in a clean container with cold water (use warm water in winter conditions) until a homogeneous mass without lumps is formed
  • It is recommended to use a mixer with 600 turns per minute
  • After the ripening time (~3 minutes) mix again
  • The temperature of the construction mixture at the time of masonry should not be lower than +80C
  • Constructions must be covered immediately after the work is completed, first with waterproofing and then with heat-insulating material, for example - with polyethylene film and mineral wool plates
  • The temperature of any base or formwork must be such that the concrete does not freeze before reaching the critical or calculated temperature during hardening min. +5°C
  • Mortars with a class not lower than M5 can be used
  • All bricks and blocks must be cleared of snow and ice before laying
  • It is recommended to perform a thermal calculation of the structure to be concreted (concrete cooling time, required thermal insulation properties, concrete setting temperature)
  • Above +5°C, antifreeze additives act as a hardening accelerator
  • The technical data refers to a temperature of +20°C and 50% relative air humidity. Lower temperature increases, higher - decreases the specified values
  • During the hardening phase of the mortar, protect from the sun, drafts and excessively high temperatures (>30°C)
  • Protect fresh adhesive from rain and too rapid drying
  • When the mortar has started to bind, no more water can be added!
  • Wash containers and tools with water immediately after processing the mortar
  • Hardened mortar can only be removed mechanically
  • Contains cement, reacts alkaline
  • Protect skin and eyes, follow technical instructions. If the mortar gets into the eyes, rinse with a large amount of water, if necessary, consult a doctor
  • Protect the packaging from weather conditions, store on wooden pallets, in a cool and dry place, cover torn packaging immediately


  • 25 kg / paper bags / 48 bags on a pallet
  • 1,000 kg / Big-Bag packaging / pre-ordered
  • 10,000 kg - 20,000 kg / mobile transport silos

Tehnical data

Volume of ready mortar (25 kg)Drying for 1mm plaster layerFire safety classStorage timeStrength class (according to LVS EN 998-2)Grain size
~ 21 l24 hEuroclass A1 (non-flammable)12 monthsM10≤0,5mm
Back to Top