Permanent floor repairs with excellent chemical resistance
Permanent repairs for acid damaged concrete floors. Concrex® Acid Strength has been developed to give outstanding chemical resistance, even against 95% sulphuric acid. It offers all the strength, ease of use and durability of Concrex® but is ideal for areas where strong chemicals are used or stored. For a full list of chemical resistance, please contact our sales team for more information.
| Properties | Incredibly chemical resistant, very tough, granite-hard finish, anti-slip, priming not normally required, impervious and non-dusting, may be feather-edged, cures in 3-6 hours at ambient temperatures, ready for heavy traffic in 8-12 hours |
| Suitable for | Concrete, metal, brick, masonry |
| Finish | Smooth |
| Interior or Exterior | Exterior, Interior |
| Composition | 2 part epoxy resin |
| Coverage | 1.2m² at 5mm thick per 10kg |
| Application tools | Steel trowel or float |
| Application | Trowel firmly against the surface to be repaired |
| Curing time (at 20°C) | 6 hours |
| Minimum application temperature | 10°C |
| Maximum operational temperature | 60°C |
| Pot life | 60 minutes at 15°C. If used past its working life, trowelling will become difficult and adhesion will be reduced |
| Storage | Between 15°C - 25°C for at least 8 hours prior to use. Do not allow to freeze |
| Shelf life | 12 months in unopened container |
| Principle limitations | Do not steam clean or subject the finished Concrex Acid Strength repair to temperatures above 60°C (140°F). Food products must be removed from the area during application and cure |
| Cleaning | When fully cured, proprietary detergents or degreasants may be used to clean the surface |
| Cleaning tools | Equipment used for mixing and applying should be wiped clean with white spirit or a similar solvent before the Concrex Acid Strength cures |
Surfaces should be clean, dry and free of all loose material. Wire brushing or sweeping is generally sufficient. Watco Bio-D degreaser can be used to remove grease and oil. If the surface is damp, it can be primed with Watco Tack Coat.
A primer is not usually required if patch or crack repairing. Watco Tack Coat adhesive primer is recommended when applying Concrex Acid Strength as a thin section screed or when applying to smooth, non-porous or metal surfaces.
Each pack of Concrex Acid Strength contains aggregate pre-blended with resin and the curing agent. If the entire pack of Concrex Acid Strength cannot be used within 30-60 minutes, the products can be part mixed.
To split a pack, carefully halve the aggregate/resin mix (ideally divide it by weight) and use half the number of curing agent bottles or tins. Do not split the contents of a curing agent or tin. Do not mix inside the plastic bucket. Wear protective gloves.
Tip the aggregate onto a mixing tray or board. Shake the bottles or tins of curing agent thoroughly until the liquid is a uniform colour. Form the aggregate into a mound and leave a small hole in the middle. Empty the curing agent into the hole, ensuring the bottles or tins are completely empty.
Carefully mix the aggregate with the curing agent using a trowel until a smooth mortar is obtained, this will take several minutes. The more thorough the mixing, the 'wetter', smoother and more manageable the mix becomes. Alternatively, you can knead the mixture by hand, but you must wear suitable gloves. It is important to mix thoroughly until you achieve a consistent colour. Machinery such as a 'Creteangle' mixer or suitable open pan mixer can be used to ensure thorough mixing of large quantities. Once mixed, the product is trowelled firmly against the surface to be repaired and finished with a steel trowel or float.
Trowel firmly against the surface to be repaired, and finish with a trowel or float. To prevent 'drag' on the trowel, moisten a rag with white spirit and wipe it across the blade, which will allow you to create a smooth finish. Concrex Acid Strength is normally applied in thicknesses of 5-50mm, but repairs can be feather-edged for a neat finish, as long as the majority of repair is at least 5mm thick. For repairs deeper than 50mm, apply in separate layers (allow 6-8 hours between layers for curing) or use Watco Concrex Deep Fill (which can be applied 15-100mm thick in one layer). There is no need to reapply Watco Tack Coat if building up layers.
Food products must be removed from the area during application and cure.
Extensive testing is what makes us the most highly qualified paint and repair manufacturer on the market. Our screeds and repair products are tested in areas of tensile, compressive strength and flexural strength.
Concrex is far stronger than concrete, we don’t need to say it, we can prove it. Here’s a comparison:
| Watco Concrex | Concrete | |
| Tensile Strength | 15.4 MN | 3.4MN |
| Flexural Strength | 55.9MN | 6.9MN |
| Compressive Strength | 55.2MN | 21.41MN |
Concrex Acid Strength offers all the strength and durability as Concrex, but it is ideal for where chemicals are stored due to it’s excellent chemical resistance - it even resists Sulphuric acid up to 95%!
CHEMICAL RESISTANCE **Excellent *Good.
| Name | Concentration | 24 hours exposure | 7 days exposure | 14 days exposure | 28 days exposure |
| Hydrochloric Acid | 35% | **
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| Sulphuric Acid | 95% | **
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| Nitric Acid | 20% | **
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| Phosphoric Acid | 85% | **
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| Acetic Acid | 5% | **
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| Tartaric Acid | 10% | **
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| Oxalic Acid | 10% | **
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| Citric Acid | 10% | **
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| Lactic Acid | 10% | **
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Learn more about the tests we carry out and how to read the results here
Full test results can be found on the Technical Data Sheet
