Beyem S AR M-25

High strength render suitable for spray machines.

BEYEM S AR M-25 is a high strength rendering dry mortar and projectable thixotropic micro-concrete, formulated with high resistance cement, selected aggregates and special additives to improve workability, and adhesion. Available in fine and thick version.

  • Suitable for spray render and pump machines or manual applications.
  • High mechanical strengths.
  • High water retentivity.
  • Excellent workability.
  • Fine smooth finishes.
  • Suitable for internal and external  situations.
  • Easy and  fast application.
  • Free of chlorides.
  • Factory produced for consistency of proportioning.

High strength rendering works. Especially suitable for construction systems with structural panels as ICFs (Insulating Concrete Forms). Works in farms, swimming pools and fillings. Support of slopes and reinforced surfaces. Basecoat for theming and modeling works when large volumes and/or armors are necessary. General purpose masonry mortar when high resistance is required. Suitable both in interior and exterior situations.

BEYEM S AR M-25  is suitable for:

  • Bricks.
  • Concrete  (treated with BEYEM UNIÓN MORTEROS adhesion promoter primer).
  • Cement based substrates.
  • Insulating Concrete Forms (ICFs).

Substrates must be clean, compact and  free of substances that reduce adhesion such as dust, oil, grease and with no loose material. Substrates must submit an adequate porosity and surface roughness. Dampen substrates with water  to cool down if they should be too warm, in case of wind or over absorbent substrates  and wait until the thin layer of water disappears. It is a good practice curing with a fine spray of clean water  24 h after application.

Do not apply on cellular concrete, gypsum based plasters, paint, plastic, wood or materials with  low mechanical properties.

Mix manually of mechanically BEYEM S AR M-25 with 3,75-4,75 (Fine) or 3,25-4,25 (Thick) l per bag of clean water until a homogeneous, creamy and lump-free paste  is obtained. Let the mix stand for 5 minutes before application.

To apply with render  spray machine, it´s necessary to set the relation water/mortar  and pump pressure depending on section and length of hose  and climatology conditions. It´s important to maintain the  variables affecting the properties of the applied mortar (distance to the wall, angle of application and water proportion). Spread the mixed product with a trowel (in case of manually or mechanically application) leaving  10-15 mm (Fine version) or 25-40 mm (Thick version) of thickness per layer.  Press to ensure adhesion and expel the air contained in the pores. Smooth with a ruler the applied material to regulate thickness. When BEYEM S AR M-25 is green (set but not fully hardened) it should be  finished using a stainless steel trowel, wooden, plastic or sponge float according to the desired effect. 

  • Always mix with the specified amount of water.
  • Do not apply below 5ºC or above 30ºC.
  • Do not apply when there is  risk of frost, rain, strong wind or direct sunlight.
  • Above recommended thicknesses, apply the product in two layers, leaving a roughness surface in the first to improve the adhesion of the second layer.
  • The minimum finishing thickness of render must be 10 mm, to contribute actively to the  waterproofing of surface.
  • Reinforcement with alkali resistant fiberglass mesh  may also be required, dependent upon substrate condition ( junctions of different surfaces, corners of voids…)  and project specification.
  • Expansion joints should be respected.
  • It is necessary to use a primer on too high absorption substrates, as a cellular concrete, or on very low absorption substrates.

Product identity. Properties of mixture and application data




Grey or White

Bulk density

≈ 1400 Kg/m3

Density of the mix

≈ 2075 Kg/m3


Fine: 0-2 mm

Thick: 0-4 mm

Mixing water 

Fine: ± 17 %

Thick: ± 15 %


20 Kg/m2  per cm of thickness

Tariff code


Final performances





≥  0,3  MPa

Compressive strength

≥  25,0  MPa

Capillary water absorption

 0,4 kg/m2min1/2

Water vapour permeability

µ = 15/35

Thermal conductivity

0,92 W/m·K

Reaction to fire

Euroclass  A1

BEYEM S AR M-25  is packed 25 kg plastic lined paper bags.

Storage: when stored unopened in a cool dry place, shelf life is 12 months from date of manufacture.

Tools can be cleaned easily with water before the product hardens. Hardened product can be remove only mechanically.

High strength rendering works, must be carried out with rendering dry mortar compliant with EN 998-1- Class GP CSIV Wc 1, such as Beyem S AR M-25 manufactured by Rodacal Beyem Company. Coverage will be ≈ 20 kg/m2 per cm of thickness. The substrate must be clean, sound, compact and dimensionally stable. Expansion joints must be respected.

For further and complete information about the safe use of our product please refer to our latest version of the Safety Data Sheet, which is available upon request.

Disposal of the product and packaging must be in accordance with current legislation. This is  responsibility of the final product user.


Technical sheet

Component Safety Data Sheet

Declaration of benefits

Factory Production Control Certificate

Certificado Sistema Gestión de Calidad ISO 9001

Certificado Sistema Gestión de la I+D+i UNE 166002

Descargar toda la documentación en ZIP


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