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Sika MonoTop 412N (25kg)

R4 Concrete Repair Mortar

Sika MonoTop®-412 N is a 1-component, fibre reinforced, low shrinkage repair mortar meeting the requirement of class-R4 of EN 1504-3.

  • Class R4 of EN 1504-3
  • Sulphate resistant
  • For hand or machine application

£29.50 Excl VAT

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Sika MonoTop®-412 N

R4 Concrete Repair Mortar

Sika MonoTop®-412 N is a 1-component, fibre reinforced, low shrinkage repair mortar meeting the requirement of class-R4 of EN 1504-3.

  • Suitable for restoration work (Principle 3, method 3.1 & 3.3 of EN 1504-9).  Repair of spalling and damaged concrete in buildings, bridges, infrastructure and superstructure works.
  • Suitable for structural strengthening (principle 4, method 4.4 of EN 1504-9). Increasing the bearing capacity of the concrete structure by adding mortar.
  • Suitable for preserving or restoring passivity (principle 7, method 7.1 and 7.2 of EN 1504-9). Increasing cover with additional mortar and replacing contaminated or carbonated concrete.
  • Tested application under live dynamic loading

System Structure

Sika MonoTop®-412 N is part of the range of Sika mortars complying with the relevant part of European Standard EN 1504 and comprising of:


  • Measurement of Specific Electrical Mortar Resistance report, Hochschule für Technik Rapperswil, Switzerland dated 14th April 2010.
  • (BAM) Bundesanstalt für Materialforschung und –prüfung – Prüfung von lnstandsetznugsmörtel nr. VII.1/126904/1 dated 1 July 2008

Product Information

Chemical Base

Sulphate resistant cement, selected aggregates and additives

Shelf Life

12 months

Storage Conditions

Store properly in undamaged original sealed packaging, in dry cool conditions.


Fresh mortar density ~2.1 kg/l

Maximum Grain Size

Dmax: 2 mm

Soluble Chloride Ion Content

≤  0.05%

(EN 1015-17)

Technical Information

Compressive Strength

1 day7 days

28 days

~17 MPa

~40 MPa

~55 MPa

(EN 12190)

Modulus of Elasticity in Compression

≥ 20 GPa

(EN 13412)

Flexural Strength

1 day

7 days

28 days

~4 MPa

~6 MPa

~8 MPa

Tensile Adhesion Strength

≥ 2.0 MPa

(EN 1542)


~500 µm/m @ 20°C / 65% relative humidity at 28 days

(EN 12617-4)

Restrained Shrinkage / Expansion

≥  2.0 MPa

(EN 12617-4)

Thermal Compatibility

≥  2.0 MPa (Part 1- Freeze-Thaw)

(EN 13687-1)

Coefficient of Thermal Expansion

~10.5 x 10-6 1/K

(EN 1770)

Reaction to Fire

Euro class A1

(EN 1504-3 cl 5.5)

Capillary Absorption

≤ 0.5 kg/(m2.h0.5)

(EN 13057)

Chloride Ion Diffusion Resistance

Low – < 2000 coulombs

(ASTM C1202)

Carbonation Resistance

dk ≤  control concrete (MC(0.45))

(EN 13295)

Electrical Resistivity

< 10.64 kΩ.cm

(EN 12696)

Application Information 

Mixing Ratio

3.6 to 3.9 litres of water for 25 kg powder

Layer Thickness

min. 6 mm / max. 50 mm

Ambient Air Temperature

+5 °C minimum; +30 °C maximum

Substrate Temperature

+5 °C minimum; +30 °C maximum

Pot Life

~40 minutes at +20°C



This depends on the substrate roughness and thickness of layer applied. As a guide, ~ 1.9 kg of powder per mm thick per m2


25 kg of powder yields approximately 13.7 litres of mortar


Sika MonoTop®-412 N can be mixed with a low speed (< 500 rpm) hand drill mixer or for machine application, using a force action mixer 2 to 3 bags or more at once depending the type and size of mixer. In small quantities, Sika MonoTop®-412 N can also be manually mixed.
Pour the recommended water in a suitable, clean mixing container. While stirring slowly, add the powder to the water and mix thoroughly for at least 3 minutes, adding additional water during the mixing time if necessary to the maximum specified amount and adjust to the required consistency.


Bonding Primer:
On a well prepared and roughened substrate a bonding primer is generally not required for this product. When a bonding primer is required, refer to the System Information above for compatible Sika products and refer to the relevant Product Data Sheet for instructions. A small amount of Sika MonoTop®-412 N can also be mixed slightly wetter than normal and used as a scratch coat to promote adhesion of the repair mortar to the substrate. Any bonding primer shall be applied on a pre-wet substrate and subsequent application of the repair mortar shall be applied wet on wet with the bonding primer.

Reinforcement Corrosion Protection:
Where a reinforcement coating is required the application of a repair mortar shall be applied wet on dry with the reinforcement corrosion protection. Refer to the System Information above for compatible Sika products and refer to the relevant Product Data Sheet for more detailed information about the reinforcement corrosion product.

Sika MonoTop®-412 N can be applied either manually using traditional techniques or mechanically using wet spray equipment. Thoroughly pre-wet the prepared substrate a recommended 2 hours before application. Keep the surface wet and do not allow to dry. Before application remove excess water e.g. with a clean sponge. The surface shall appear a dark matt appearance without glistening and surface pores and pits shall not contain water.

When manually applying first make a scratch coat by firmly scrapping the repair mortar over the substrate surface to form a thin layer and fill any pores or pits in the surface. Ensure the whole surface to be repaired is covered by the scratch coat. Build up layers from bottom to top by pressing mortar well into the repair area. The surface can be finished according to the requirements using a float while wet or with a relevant rough-cast tool as soon as the mortar has started to stiffen.


Protect the fresh mortar immediately from premature drying using an appropriate curing method e.g. curing compound, moist geotextile membrane, polythene sheet etc.


Clean all tools and application equipment with water immediately after use. Hardened material can only be mechanically removed.

Additional information

Weight 25 kg
CPRL Colours





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