Solvent-Free, Minimum-Slump, High-Adhesion Epoxy Mortar. 

epidermix 525 is a solvent-free, two-component, epoxy mortar, formulated to exhibit high adhesion and minimum slump characteristics.

For repairs: 

  • to honeycomb concrete,
  • arrises,
  • precast elements,
  • weirs and spillways.
  • Where good chemical resistance is required.

For bedding: precast concrete units

  • High early strength ensures limited impact on construction programs or maintenance shutdowns
  • The high ultimate strength makes it suitable for structural repair use
  • High resistance to abrasion
  • Cures under standing water and damp conditions
  • Good chemical resistance to wide range of corrosive materials
Surface Preparation

Cleaning of the surface to be repaired is best achieved with a light sand grit blast and/or scabbling to remove all loose material, corrosion products or any other deleterious materials. Contaminants such as oil and grease should be removed by steam cleaning, detergent scrubbing or the use of a proprietary degreaser.

Any corroded, exposed steel must be cleaned to a metallic finish and concrete cut back behind the steel to fully expose the back of the bars. See data sheet ‘Preparation of Surfaces’.

All repairs to be cut back to a minimum thickness of 5mm to a sawn edge. Minimum application thickness of epidermix 520 is 5mm.

Typical Physical Properties
Compressive strength ASTM C109 80 Mpa at 7 days
Flexural strength  (BS 6319, Pt3) at 20°C 6,5 Mpa at 7 Days
Tensile strengths  (ASTM C307) at 20°C 11 Mpa at 7 days
Pot life (at 20°C) 1 hour
Initial cure 24 hours
Full cure 24 hours
Relative density 1,80

Chemical Resistance

(Performance of epidermix 525 continually immersed at 20º C)
Acetic acid 5% High
Diesel fuel/petrol 100% Very high
Sulphuric acid 34% Very high
Sugar solutions 100% Very high
Hydrocarbons 100% Very high
Fatty acids 100% Very high
Sodium hydrochlorides 30% Very high


Bonding / Priming

All exposed rebar to be coated with dura.®rep ZR primer to give an unbroken finish and allowed to dry.


Kneading with gloved hands best mixes epidermix 525. Empty the base component on a pre-wetted board and spread it out. Place the activator in the centre of the base material and knead the two components together (like mixing bread dough) until the mixture is one color and consistency. Do not add water.


1 litre/m2/1mm thickness.


Tightly pack the mixed epidermix 525 behind any exposed steel with a gloved hand. All other areas have to be applied with a wood float. Smooth finish can be achieved using a wetted steel float. epidermix 525 can be applied in a single layer up to 50mm thick horizontally and up to 12mm thick vertically. Thicker sections can be built up in layers by scratching the surface of the first layer and applying a second layer some 8 to 24 hours later at 25°C.

Should the epidermix 525 begin sagging, it should be immediately removed and a thinner layer applied. A smooth finish can be achieved with a wetted steel float. Minimum thickness of any repair should not be less than 5mm. When epidermix 525 is to be placed underwater it should be mixed and carried down in polyethylene bags. Small quantities are then pressed firmly into position by hand or trowel working upwards. It is advisable to cover areas not greater than 0,15 m2 at a time. The underwater application thickness should be restricted to 5mm.


Tools may be cleaned with abe® super brush cleaner immediately after use before the material has had time to cure. Hardened material can only be cleaned by mechanical means.


As with all epoxies, the mixture may not be applied to substrates at a temperature lower than 5°C. At ambient temperatures above 35°C, working time and pot life will be drastically shortened.

Model Specification

Two-component, high-build epoxy mortar for fast reinstatement of concrete in vertical and overhead applications where general non-acid chemical resistance is needed. Cures under damp conditions and under standing water.

The mortar will be epidermix 525, a two-component, solvent-free, high-build epoxy resin mortar system applied in accordance with the recommendations of a.b.e.® Construction Chemicals, including dura.®rep ZR primer for steel where necessary.


epidermix 525 is supplied in 2 liter kits.

Handling & Storage

This product has a shelf life of 24 months if kept in a dry cool place in the original packaging. In more extreme conditions this period might be shortened.

Health & Safety

Wet epidermix 525 is toxic but non-flammable. Ensure the working area is well ventilated during application and drying. Avoid flames in vicinity. Always wear gloves and protective eyewear when working with the material and avoid excessive inhalation and skin contact. If material is splashed in the eye, wash with plenty of clean water and seek medical attention. Cured epidermix 525 is inert and harmless.

Important Note

This data sheet is issued as a guide to the use of the product(s) concerned. Whilst a.b.e.® Construction Chemicals endeavors to ensure that any advice, recommendation, specification or information is accurate and correct, the company cannot – because a.b.e.® has no direct or continuous control over where and how a.b.e.® products are applied – accept any liability either directly or indirectly arising from the use of a.b.e.® products, whether or not in accordance with any advice, specification, recommendation, or information given by the company.

Further Information

Where other products are to be used in conjunction with this material, the relevant technical data sheets should be consulted to determine total requirements. a.b.e.® Construction Chemicals has a wealth of technical and practical experience built up over years in the company’s pursuit of excellence in building and construction technology.