New Guard Coatings

Fosroc Conbextra HF

Fosroc Conbextra HF

High-flow non-shrink, cementitious grout, used for gap thicknesses, from 10-100mm.

Fosroc Conbextra HF

Fosroc Conbextra HF is a high-flow non-shrink, cementitious grout, used for gap thicknesses, from 10-100mm


Product Description

Conbextra HF is supplied as a ready to use dry powder. The addition of a controlled amount of clean water produces a free-flowing grout for gap thicknesses up to 100mm. In addition the low water requirement ensures high early strength and long-time durability. Conbextra HF is a blend of Portland cements, graded fillers and chemical additives. The filler grading produces a highly flow-able grout which will not segregate or bleed.


Product Advantages

  • Non-shrink
  • Highly flow-able
  • High early age strength
  • Chloride free
  • Suitable for pumping
  • Supplied as a ready-to-use dry powder


Product Uses

  • Stanchion baseplates
  • Joints between pre-cast concrete panels
  • Grouting applications where pouring access is restricted
  • Anchoring or reinforcing steel bars
  • Installation of tie bars




Water addition.




4.5 – 4.8 litres to 25kg bag – yield approx. 13.25 litres


Initial Set

Approx. 6 hours



A data / instruction sheet will be supplied with this product. Please take care when using and wear appropriate PPE – Gloves, protective eye goggles.


Additional Information

Conforming to the requirements of BS EN 1504-3 Class R4 and BS EN 1504-6: Anchoring of reinforcing steel bar.


Specification Clause

The grout shall be Conbextra HF, a pre-bagged, single component cementitious material which conforms with the requirements of BS EN 1504-3 class R4 and BS EN 1504-6. The grout shall fully conform to the requirements of US Army Corps of Engineers Specification for non-shrink grout CRDC621-82A It shall be mixed with clean water to the required consistency and not exhibit bleed or segregation A volumetric expansion of up to 1% shall occur while the grout is in a plastic state by means of a gaseous system. The compressive strength of the grout must exceed 40 MPa at 7 days and 65 MPa at 28 days. The storage, handling and placement of the grout must be in strict accordance with the manufacturer’s instructions.


Contact Us

For further advice regarding the use of this product, technical support or a quotation please contact us.


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