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Perma MRA – WB



Perma MRA-WB is supplied as a pale amber liquid which turns white when diluted with water to produce a chemical release agent, combining the outstanding release properties of such materials with the economy of conventional oil. It reacts with the alkali in the concrete to form a thin water repellent skin on the surface of the mould which enables easy stripping from the hardened concrete.


For easy and stain free release of concrete moulds and formwork of all types. Particularly where wooden formwork is used and de-moulding or stripping times exceed 24 hours.


  • Non-staining: No cleaning of unsightly oil stains if plastering is not required.
  • High quality : It Produces fair faced finish concrete.
  • Versatile: It can be used on all types of moulds.
  • Minimises cleaning : It makes cleaning of form faces between pours very easy.
  • Concentrate form : It reduces storage and transport costs.
  • Water based : It only requires water for dilution.
  • Corrosion inhibitor: It aids corrosion inhibition.


Dilution rate -1 part Perma MRA-WB to be diluted with 6 parts clear water (by volume)
Formwork surfaces – May be used on wooden or metal surfaces.
Non-staining – Can be used safely with white cement
Specific Gravity – 0.96 at 25°C


Mixing: First dilute Perma MRA-WB concentrate in the proportion of 1:6 with water, using a clean container and stirring thoroughly until evenly mixed. If the solution is not used the same day, it should be stirred again before use and may require very good stirring and agitation after 5 days of storing.

New Moulds: No preparation is normally necessary in metal moulds. If showing signs of rust, it must be wire brushed or treated with emery cloth and cleaned before coating.

Used moulds: Must be thoroughly cleaned and free from old concrete, dirt, cement laitance, old mould oil and other contaminations. Use a strong detergent for removal of oil and grease and Multiclean for removing cement and concrete deposits.

Application: Apply Perma MRA-WB 1:6 water dilution to the face of the formwork by spray, brush or cloth. Only one coat should be applied ( as thinly as possible except on very absorbent new timber where two coats may be necessary for the first application only ) and allow it dry. If the formwork is not used for several days, a further coat may be applied. Only a very thin film of Perma MRA-WB should be applied. Excess could lead to surface dusting of the concrete. Best results are obtained by applying with a fine mist sprayer. Where a cloth is used, it should first be soaked in the release agent and then squeezed out well before applying. This ensures the thinnest possible film. Perma MRA-WB is not generally recommended where demoulding is required within 24 hours, although excellent results may be obtained with shorter times.

Drying time: It is essential that the Perma MRA-WB is thoroughly dry before placing concrete. Otherwise, being an emulsion, its performance may be impaired. In condition of high humidity drying times will be much longer than in warm dry conditions.

Rainfall: It is necessary to protect freshly coated formwork from rain which may dilute the emulsion before it has dried. After drying the coating will withstand an occasional light shower but may be affected by heavy or continuous rain. In such cases, a further coat is advised once surfaces have dried out thoroughly.

De-moulding : De-moulding can be carried out in the normal way and no special precautions are necessary.

After de-moulding : Formwork surfaces must be thoroughly cleaned, but this is normally easy due to the excellent release action.

Repetitive re-use: The cleaned formwork surfaces must be recoated with Perma MRA-WB each time, in accordance with normal practice.


  • Check whether mould surfaces are really clean before re-use?
  • Is a fresh coat of Perma MRA-WB applied before each re-use?
  • Has the Perma MRA-WB been diluted exactly 1:6 with water by volume?
  • Check whether the coverage rate is the highest and film thickness the lowest possible?
  • Is the coat really dry before placing the concrete?
  • (Remember change in weather condition can alter drying times significantly check before placing fresh concrete)

  • Is the de-moulding time 24 hours or more?
  • If the answers to one or more of these questions are ‘No’, it usually explains the reason for the problem experienced which can be rectified accordingly.
    (a) 1 litre of Perma MRA-WB when diluted with 6 litres of water will cover 80 to 180 m2 depending upon the nature of the substrate. Always aim to achieve the highest coverage rate.
    (b) Unsealed timber or plywood – 80 to 115 m2 in 7 litres of solution. If coverage rates are appreciably less than these and satisfactory results are not being achieved, then coverages should be increased as close to the higher figure as possible.


    Gloves should be worn when handling Perma MRA WB. Splashes on skin should be removed with soap and water. Contact with eyes should be avoided and accidental contamination should be washed with plenty of water and medical treatment sought immediately. If swallowed, obtain immediate aid. Do not induce vomiting. Ensure good ventilation.

    Flash point of Perma MRA-WB is approximately 60°C.


    Perma MRA-WB is available in 10 ltr, 20 ltr and 100 ltr containers.


    Perma MRA-WB has a shelf life of 24 months provided the temperature is kept in the range of 5° C-40°C. If this temperature is exceeded in any respect, advice should be sought from the supplier. Diluted Perma MRA-WB will remain stable for at least 5 days but must be re-stirred and agitated before use.


    PERMA warrants that all products are free from any defects of manufacture and comply with the specifications given in their respective technical data sheet. No warranty can be given as to the results of use because conditions of use, such as site conditions, surface preparations, workmanship, weather, structural issues and other factors are beyond the control of PERMA. Purchaser agrees to seek the advice of qualified professionals to carry out tests & take trials to determine the suitability of products for their intended purpose prior to full scale usage of PERMA products and assumes all risks.

    The company does not assume any liability for unsatisfactory results, arising from the use of our products. Purchaser’s sole liability is limited to replacement of product or refund of the purchase price paid if any product proven defective. No other warranties, express or implied, shall apply including any warranty of merchantability or fitness for a particular purpose.
    PERMA shall not be liable for any consequential damages arising from the use of our products for unsatisfactory results.

    The information supplied in this datasheet is based on our experience through extensive research and is given in good faith in order to help prospective users. We reserve the right to update the information provided in our technical data sheet at any time without prior notice within the scope of technical progress or new developments.

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