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Estopatch HB

Acrylic Emulsion Bonding Agent

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Estopatch HB

 Single Component Lightweight Polymer Modified Concrete Reinstatement  Mortar For High-Build Applications


Estopatch HB is a pre-pack, single component dry powders which requires only the site addition of clean water to produce a consistent, lightweight repair mortar. The material is polymer modified to provide a mortar with good handling characteristics, while minimising water demand. The hardened product exhibits excellent thermal compatibility with concrete and outstanding water repellent properties. The low water requirement ensures fast strength gain and long-term durability.


Estopatch HB is alkaline in nature and will protect embedded steel reinforcement. It is specifically designed for vertical and overhead high-build applications. The mortar is suitable where exceptional chloride and carbon dioxide resistance is required.


  • Lightweight formulation enabling extra high-build.
  • Can be applied by the wet spray process for fast, exceptionally high-build repairs with enhanced strength.
  • Low permeability provides maximum protection against carbon dioxide and chlorides
  • Excellent bond to the concrete substrate
  • Shrinkage compensated
  • Pre-bagged to overcome site-batched variations – only the site addition of clean water required
  • Contains no chloride admixtures

Standards Compliance

  • BS1881
  • BS 6319
  • ASTM C942
  • BS 6920

Physical Properties

The following results  were obtained  at  a water powder ratio   of 0.14 and temperature of 20°C

Compressive Strength (N/mm2) BS 6319

1 day

7 days

28 days



> 15

> 35

> 45

Flexural Strength (N/mm2) BS 6319

28 days



> 4.5

Tensile Strength (N/mm2) BS 6319

28 days



> 3.0

Water Absorption ISAT (ml/m2/sec) BS 1881

10 mins

2 hours





Chloride Diffusion (cm2/sec) Taywood Method  

< 2 × 10-10

Carbon Dioxider Barrier –

Equivalent thickness of concrete to Estopatch HB @ 10mm (Taywood Method) :


Equivalent thickness of air to  Estopatch HB @ 10mm (Taywood Method) :




800 mm




320 metres

Coefficient of Thermal Expansion (°C)  

7 to 12 × 10-6

Setting Time, hrs

Initial set Final set


2 – 3

4 – 5

Fresh Weight Density, kg/m3 Approx. 2200 Dependent on actual consistency used
Chemical Resistance Highly impermeable to acid gases, chloride ions, oxygen and water


Application Instructions

Surface Preparation

Saw cut the repair locations to a depth of at least 10mm.  Substrate shall be thoroughly clean, free of laitance, oil, dust, grease, plaster, paint, corrosion and any other deleterious substances. Smooth surfaces should be mechanically roughened by scrabbling or needle gun to form a good mechanical key. All reinforcing steel must be grit blasted to a profile of SA 2 ½ prior to the application of recommended primer.

Edges of the areas for repair must be saw cut to 10mm and blow out all loose dust with dry, oil free compressed air.


All surfaces must be primed prior repair. Reinforcing steel must  be primed with galvanized protective coating or epoxy system which will prevent further corrosion.

All concrete surfaces should be thoroughly soaked but leaving no surface water. Concrete surface must be primed with Estobond Acryl bonding agent which is scrubbed onto the surface of the concrete. It will dry in approximately 30 mins. Estopatch HB should be applied when the Estobond Acryl is still tacky.


Ensure that Estopatch HB is thoroughly mixed prior to use. It is essential that quantities of one bag or more are mixed in a forced action pan mixer or with an electrical hand mixer. For normal applications 2.8 – 3.0 litres of water should be added to 20 kg  bag.


Apply the mixed Estopatch HB to the prepared substrate by gloved hand or trowel. Work a thin layer of the mortar into the primer and then build the mortar on to this layer. Thoroughly compact the mortar on to the primed substrate and around the exposed reinforcement.

Estoptch HB can be applied in sections up to 40mm thickness  in vertical locations and up to 20mm thickness in overhead locations in a single application and without the use of formwork. If formwork is used for greater thickness, it should be properly primed with primer to ensure no water is absorbed from the Estopatch HB. In horizontal application, Estopatch HB can be applied up to 150mm thickness. The minimum applied thickness of Estopatch HB is 5mm.

Thicker section can be built up by multiple layers. It is recommended the surface of the intermediate layers should be scratch-keyed and re-priming with Estobond Acryl and the further application of Estopatch HB shall be applied as soon as this layer has set.

Estopatch HB can be applied by the wet spray technique where large areas of repair are required.


Estopatch HB is a cementitious repair mortar. It must be cured immediately after finishing in accordance with good concrete practice. Estocure curing compound is recommended for this usage.


Estopatch HB should be removed from tools with clean water immediately after use. Cured material can only be removed mechanically.

Packing & Size

Estopatch HB 20 kg bag
Estobond Acryl 20 litre pail



Estopatch HB Approx. 10.0L / 20kg bag



Estopatch HB Approx 1.0 m2 at 10mm thick
Estobond Acryl 4 – 6 m2 per litre depend on

                                                     porosity of substrate                

Technical Support

Estop offers a comprehensive range of high performance, high quality of repair product for both new and existing concrete surfaces. In addition, the company offers a technical support package to specifiers, end-users and contractors, as well as on- site technical assistance.


Estopatch HB has a shelf life of 12 months if maintained in dry storage conditions in unopened bags. This may be reduced if store in location of high humidity.


Estopatch HB contains cement powder, which might be harmful to sensitive skin. In case of contact with eyes, rinse with water immediately and seek medical advice.

Additional Information

Estop manufactures and offers a wide range of complementary products which includes waterstops, waterproofing products, grouts, anchors, specialized flooring products. In addition, a wide range of products formulated for repair and refurbishment of spalled concrete are available.