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MCR 300AR – Acid & Chemical Resistant Epoxy Repair Mortar

£302.00 Excl VAT

MaxCrete 300 is an acid and chemical resistant repair mortar and screed.  Formulated with Epoxy novolac resins, when cured the material provides excellent chemical resistance to strong acids and industrial chemicals. Designed principally for the long-term protection of concrete surfaces subject to chemicals, either in immersed conditions or incidental contact.


MAXCRETE 300AR – ACID RESISTANT REPAIR MORTAR is formulated  to provide outstanding resistance against concentrated acids and industrial chemicals.

MCR 300AR – is the perfect solution for the repair of damaged concrete where long-term chemical protection is required. The material is suited to high traffic areas or applications that are fully immersed.


  • Concrete strucures 


  • Lining for bunds & containment areas
  • Re-lining chemical drains & channels
  • Chemical drop-down areas
  • Chemical production floor areas


  • Safe to use in a confined space
  • No coating shrinkage or cracking
  • Resists concentrated chemicals
  • Protects for longer


MAXCRETE 300AR – ACID RESISTANT EPOXY SCREED is formulated using the highly chemical resistant epoxy Novolac resin system. The material solvent free and has been designed to be rebuild and protect concrete surfaces in high traffic areas where concentrated acids and industrial chemicals are present.

The product is should be to new or old concrete and should be applied at a minimum thickness of 5mm with no up limit.  

Once cured the product will resist

  • 98% Sulphuric acid
  • 36% Hydrochloric acid
  • 75% Phosphoric acid.


  • Lining for bunds & containment areas
  • Re-lining chemical drains & channels
  • Chemical drop-down areas
  • Chemical production floor areas
  • Pump & Tank plinths

Surface Preparation Concrete

Remove any contamination and lightly abrasive blast or scarify taking care not to expose the aggregate.

Allow new concrete to cure for a minimum 21 days and remove any surface laitance before coating.

Suitable for applications where the surface temperature is 5°C or above

Power floated concrete – use a vacuum assisted shot blaster or floor grinder to remove weak laitance and provide a surface key for the coating.

Loose paint or rust – remove using a vacuum assisted shot blaster or floor grinder or equivalent method.

Loose or friable concrete – use a vacuum assisted shot blaster or floor grinder.

Oil or grease – use hot compressed air for large areas of contamination.

Smaller, isolated deposits may be chemically cleaned with a standard degreaser product.

Priming Concrete

All concrete surfaces will require priming before the screed can be applied. Take moisture level readings and choose the most suitable primer for your application. For moisture readings below 8% we recommend MAXPRIME 100 – Concrete Surface Primer if the reading are higher than 8% but below 25% then our recommendation would be to use MAXPRIME 200 – Damp Tolerant Concrete Primer

Using MAXPRIME 100 or MAXPRIME 200  – Mix the base component (amber liquid) with the activator component (amber- liquid) in full units as supplied, ideally, use slow speed paddle mixer. When mixing both materials, it is essential to have a uniform streak free fluid. Once mixed, the material should be used within 40-45 minutes at 20°C. 


1 x 30kg Unit of MAXCRETE 300AR  consists of:

  • 1 x 3ltr  MCR 300AR – BASE RESIN
  • 1 x 1ltr  MCR 300AR – ACTIVATOR RESIN
  • 1 x 20ltr TIN WITH 24KG OF AGGREGATE
  • 1 x 0.666ltr MPR 100 – PRIMER BASE RESIN
  • 1 x 0.333ltr  MPR 100 – PRIMER ACTIVATOR RESIN

Pour the  Screed Activator (small tin) into Screed Base container and mix using an electric paddle. Ensure all of the material is thoroughly mixed and streak free. Once mixed, pour the contents of the container into a dual action mixer.

Add half of the 24kg pail of aggregate and begin to mix. Once the resin and aggregate have mixed and the remaining contents of the 20ltr pail containing the aggregate. Please ensure you pay attention to the bottom and sides of the mixer and ensure all of the contents are mixed properly.

WARNING: In colder climates or when the product is being applied to concrete surfaces lower than 12°C, add 75% of the aggregate and check the consistency of the mix. Colder temperatures will thicken the resin and therefore less aggregate is required to create a trowel applied product.

Just add part of the remaining 25% of aggregate to create the correct level of consistency.


Once you have the correct consistency pour empty the contents of the mixer into 20ltr pails and pour the mixed product onto the floor. Spread the screed with a trowel or rubber squeegee and then smooth off to the required thickness.

Once the repair area has been filled with material spray clean water onto the face of the float and skim the surface with light pressure. This will give MAXCRETE 300AR a smooth finish


The practical coverage rate for a 30kg unit of MAXCRETE 300AR is as follows:

  • 5mm 2.7 sqm
  • 10mm 1.35 sqm
  • 20mm 0.675 sqm
  • 30mm 0.45 sqm

Pot Life @ 20°C

20 – 25 minutes

Cure &       Over-Coat

Times at 20°C

The applied material should be allowed to harden for the times indicated below before being subjected to the conditions indicated:

  • Usable life: 20 – 25 minutes
  • Hard Dry: 4 – 6 hours
  • Light loading: 12 hours
  • Full loading:  4 days

 Minimum – over – coating time 4 hours

 Maximum – over-coating time 12 hours.

Where the maximum over coating time is exceeded, the material should be allowed to harden before being abraded, or flash-blasted and solvent washed to remove any surface contamination

Typical Properties

  • Abrasion Resistance Taber CS17 Wheels/1 Kg load 145mg loss/1000 cycles 0.53cc loss/1000 cycles
  • Compressive strength Tested to ASTM D 695 880kg/cm² (12500psi)
  • Flexural Strength Tested to ASTM D790 490kg/cm² (7000psi)
  • Direct Pull off Adhesion Tested to ASTM D4060 35kg/cm² (500psi) Concrete failure
  • Impact Resistance Tested to ASTM D256 1.8 joules Shrinkage Tested to ASTM C246 Nil

Health and Safety

Please ensure good practice is always observed, during the mixing and application of this product.

Protective gloves must be worn during the mixing and application of this product. Before mixing and applying the material please ensure you have read the fully detailed Material Safety Data Sheet.

Legal Disclaimer

The data contained within this Technical Data Sheet is furnished for information only and is believed to be reliable at the time of issue. We cannot assume responsibility for results obtained by others over whose methods we have no control. It is the responsibility of the customer to determine the products suitability for use.

Maxkote accepts no liability arising out of the use of this information or the product described herein.


MCR 300AR – ACID & CHEMICAL RESISTANT REPAIR SCREED offers excellent chemical resistance against a wide range of concentrated acid and industrial chemicals:

Typical Chemicals & Temperatures:

  • Acid 10% / 30˚C
  • Ammonia Hydroxide 30% / 45˚C
  • Benzene 100% / 35˚C
  • Butanol 100% / 40˚C
  • Chromic Acid 10% / 40˚C
  • De-ionised Water / 40˚C
  • Ethanol 100% / 45˚C
  • Hydrobromic Acid 40% / 30˚C
  • Hydrochloric Acid 36% / 35˚C
  • Nitric Acid 10% / 30˚C
  • Phosphoric Acid 75% / 45˚C
  • Steam out 180˚C
  • Sulphuric Acid 98% / 40˚C
  • Toluene 100% / 40˚C
  • Xylene 100% / 40˚C

For further information the chemical resistance of this material, please do not hesitate to contact us! info@maxkote.co.uk




Additional information

Weight30 kg