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Estopatch SC50

Acrylic Emulsion Bonding Agent

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Estopatch SC50

Premixed Mortar for Spray Mortar Application

(Dry and Wet shotcrete application)


ESTOPATCH SC50 consists of cement, size-controlled aggregates and special cement additives. The sprayed mortar can achieve excellent bonding and early strength, enable low  dust generation and low rebound during spraying. The spraying  of the mortar requires a system equipped with mixing and pumping equipment. This is suitable for both dry and wet shotcrete application.

Estopatch SC50 shall be applied together with Denka Natmic AFS as fast set spray mortar system.


Estopatch SC50 is suitable for the following applications:

  • Mining application for stabilizing and strengthening (e.g: tunnel wall, underground workshop)
  • Repair of existing tunnels
  • Support for small cross-section tunnels
  • Reinforcement for unconsolidated ground
  • Ground support after TBM excavations


  • Fast-setting property
  • Low dust generation and low rebound
  • Excellent compressive strength, bond strength and flexural strength over the long term from early on
  • Excellent resistance to inflow
  • Compact system design and easy operation
  • Enable for wet and dry type of shotcrete


Physical Properties

Initial Setting Time, min < 10
Compressive Strength, N/mm2 12 hours

28 days


> 10

> 35


Application Instruction

Surface Preparation

Substrate must be structurally sound, clean and free from laitance, oil, dust, grease, paint, corrosion and any other deleterious substances. Steelwork should be thoroughly cleaned and primed.

Immediately prior the application of spray mortar, the dust and any other deleterious substances should be removed by water or compressed air.


Dry process

Introduce both powder and water at the nozzle for mixing.

Wet process

Premix the powder and water, then pump the mixture to the nozzle.

Mix design for dry and wet process:

Estopatch SC50     : 25kg

Water                      : minimum 13% (3.25kg)

: maximum 18% (4.50kg)

Denka Natmic AFS : 2%~4%(0.5kg~1.0kg)


The mixed mortar should be sprayed continuously to a uniform required thickness. Multiple layers spraying is not recommended.


Estopatch SC50 is a cement based spray mortar. It must be appropriate cured immediately after finishing in  accordance with good concrete practice or Estocure curing compound is recommended for this usage.

Note : Shrinkage cracks shall depend on the curing method.  As such applicators need to be prepared to have a good curing product or method to mitigate shrinkage and cracks.


Estopatch SC50 should be removed from tools and equipment immediately after use with adequate water.

Packing & Size

Estopatch SC50 25 kg bag
Denka Natmic AFS 260 kg drum



Estopatch SC50 with

   Denka Natmic AFS                 

12.8 litre  per  bag  depending on water addition



Estopatch SC50 with Denka Natmic AFS 0.25 m2  per bag at 50mm thick

These figures are for guidance only. Actual coverage will depend on the texture and porosity of the surface being covered.

Technical Support

Estop offers a technical support package to specifiers, end-user and contractors, as well as on site technical assistance.


Estopatch SC50 should be stored at room temperature. Keep dry out of direct sunlight.

If these condition are maintained and the product is unopened, then a shelf life of 12 months can be expected


Gloves and goggles should be worn. Any splashes to the skin or eyes should be washed off with plenty of clean water. In the  event of prolonged irritation, seek medical advice. Since it content of solvent, stay it away from fire. Application areas must be well ventilated.

Additional Information

Estop manufactures and offer 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.