Conbextra HF


Free flow, cementitious grouting for gap thicknesses 10–100 mm.

Recommended for the following applications:

  • Large stanchion baseplates.
  • Joints between pre-cast concrete panels.
  • Pumped grouting applications.
  • Grouting applications where pouring access is restricted.


  • Non-shrink.
  • Highly flowable.
  • High strength.
  • Chloride free.
  • Suitable for pumping.


The substrate surface must be free from oil, grease, or loosely adherent material. If the concrete surface is defective or has laitance, it must be cut back to a sound base. Bolt holes and fixing pockets must be blown clean of dirt or debris.

The area of cleaned foundation should be flooded with fresh water for two hours prior to grouting. Any free water should be removed immediately before grouting, with particular care being taken to blow out all bolt holes and pockets.

General information

Uniclass 2015

Pr_20_31_53_13 Cementitious groutsPrimary


G10/443 Proprietary filling/ bedding of column bases

G10/55 Mortar filling/ Bedding of column bases

Specification data - Cementitious grouts

Product Reference

Conbextra HF

Standard product features

Compressive strength:

  • 1 day: 25 N/mm².
  • 7 days: 44 N/mm².
  • 14 days: 56 N/mm².
  • 28 days: 64 N/mm².
  • 189 days: 82 N/mm².

Flexural strength:

  • 1 day: 2.5 N/mm².
  • 7 days: 8.0 N/mm².
  • 14 days: 9.5 N/mm².
  • 28 days: 10.0 N/mm².
  • 180 days: 11.0 N/mm².

Young's modulus:

29 kN/mm².

Setting time:

  • Initial set: 5.5 hours.
  • Final set: 7.5 hours.

Pack size:

25 kg bags.


Technical data sheet catalogue

Technical data sheet catalogue

Fosroc Grouting Solutions

Fosroc Grouting Solutions

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