Conplast MR260 - General purpose plasticiser admixture

General purpose plasticiser admixtures. Dosage: 0.3-1.0% over cement weight.









For the manufacture of concrete of different consistencies, without changes in the dosage of aggregates or cement, modifying only the dose of additive in the prepared concrete plant.

At low doses it maintains the behavior of the conventional plasticizers.

It can also be used as a plasticizer or as a high-grade water reducer when added at high doses.


  • The required consistency is maintained for longer periods of time, which makes it possible to use it in a concrete plant
  • It can be used in reinforced concrete, prestressed or in mass, to be free of chlorides.
  • It facilitates the placement of concrete in a simpler and faster way.
  • Increases concrete cohesion, as well as its resistance to freeze-thaw cycles
  • Increases mechanical resistance considerably.
  • It is especially suitable for pumping. It allows to increase the workability without adding extra water and therefore maintaining the levels of resistance.


Conplast MR260 complies with UNE-EN 934-2: 2010 Table 2 as a water reducer / plasticizer.


Conplast MR260 is a multifunctional plasticiser formulated based on a mixture of synthetic and natural polymers, which can be used as plasticizer or superplasticizer depending on the dose used.

Typical dosage

The optimal dosage of Conplast MR260 to achieve specific requirements must be determined by testing, using the materials and conditions that will be used in practice. A starting point for such tests is to use a dosage between 0.3 liters and 1.1 liters of Conplast MR260 per 100 kg of cementitious material, including ash, slag or microsilica.

The following doses of additive may be used as orientation for the following consistencies:

  • Dried-Plastic of 0.3-0.5 liters / 100 kg of cement
  • Soft 0.5-0.6 liters / 100 kg cement
  • Fluid of 0,7-0,8 liters / 100 kg of cement
  • Net of 0.8-0.9 liters / 100 kg of cement


The following results were obtained at a temperature of 20 ° C:

  • Appearance: Dark brown liquid
  • Density: 1.185 ± 0.01 kg / l
  • PH: 3.5 ± 1.0
  • Content in water-soluble chlorides (CI-): ≤ 0,10%
  • Alkaline content (Na2O equivalent): max. 5% by mass
  • Main function: Increase workability
  • Secondary function: Increase mechanical resistance

How to use


Conplast MR260 is compatible with other Fosroc Euco additives in the same concrete mix. If more than one additive is used, these must be added to the concrete separately and not mixed together before being added. The resulting properties of the concrete containing more than one additive should be checked by prior testing.

Conplast MR260 is suitable for use with all cements complying with the RC-08 standard.

Reduced water permeability

One of the most effective means of reducing the permeability of a concrete mixture is to reduce the water / cement ratio. Conplast MR260 can be used to achieve this reduction and produce a low permeability concrete.

Effects on setting

Most water reducing additives cause some delay in the setting of the concrete. This delay may also be affected by factors other than the additive, such as the mixture itself or the conditions under which it is produced. In particular, tests to test the effects of a particular mixture are particularly recommended.

Dosing system

The correct amount of Conplast MR260 should be measured by a suitable doser. To obtain the best results, the additive should be added to the concrete in the kneading water or directly in the mixer at the same time as the water. Contact the Technical Department of Fosroc Euco to be advised on the proper dosing equipment and its installation.

Effects of overdosage

An overdose of twice the maximum indicated dose can cause delay of concrete setting as well as an additional air occlusion.


The final characteristics of all structural concrete will depend on good curing practice. Therefore, it is very important to use a Fosroc Euco Concure curing membrane, water spray or wet burlap.

Cleaning and Disposal

Conplast MR260 spills should be absorbed with sand or earth and transferred to appropriate containers. The product residues should be sandblasting with large amounts of water. Disposal of the product and packaging is the responsibility of the end user.


Conplast MR260 can cause an increase in setting delay, depending on the dose used and the temperature. If you get any particular application, a delay in undesirable setting, consult with the Technical Department of Fosroc Euco.


Conplast MR260BC has a storage period of 12 months if kept in a dry place and in its original containers and closed at a temperature of between 2 ° C and 40 ° C.

Freezing point: -3 ° C approx.


Safety and hygiene

Conplast MR260 should not be ingested or put into contact with skin and eyes. Wear protective gloves and goggles.

Splashes on the skin are removed with water. In case of contact with eyes, remove immediately with plenty of water and seek medical advice. If swallowed, seek medical advice immediately. Do not induce vomiting.

For more information, consult the Material Safety Data Sheet.


Conplast MR260 is water-based and non-flammable.


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