Conbextra GP


General purpose cementitious grouting for gap thicknesses 10–75 mm. It is a blend of Portland cements, graded fillers and chemical additives. The graded filler is designed to assist uniform mixing and produce a consistent grout. A low water demand ensures high early strength.

Recommended applications at flowable consistency include stanchion base plates, bolt pockets and void filling. At trowellable consistency it is recommended for bedding load bearing components.


  • Chloride free.
  • Non-shrink.
  • Non-staining.


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


Chloride free



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 GP

Standard product features

Technical properties:

  • Bond strength by pull off (to BS EN 1542): 2.6 MPa.
  • Chloride ion content (to BS EN 1015-17): 0.02%.
  • Compressive strength (to BS EN 12190): 15 MPa (1 day), 45 MPa (7 days), 65 MPa (28 days).
  • Flexural strength (to BS 6319-3): 10 MPa (28 days).
  • Reaction to fire (to BS EN 13501-1): Class A1.
  • Setting time: Six hours.
  • Time for expansion: 15 minutes (start), 2 hours (finish).

Pack size:

25 kg bags.


Technical data sheet catalogue

Technical data sheet catalogue

Fosroc Grouting Solutions

Fosroc Grouting Solutions

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