Renderoc ST 05

Repair mortar for application in thin layers, the filling of blow-holes or imperfections in concrete to produce a smooth surface. It is a blend of Portland cements, graded aggregates, lightweight fillers and chemical additives to which a controlled amount of clean water is added in situ. It conforms to the requirements of BS EN 1504-3 Class R4 and can be used as a scrape-coat, brush or trowel applied and placed in thicknesses of 0–5 mm.


  • Easy to mix and apply.
  • Excellent bond to concrete without priming.
  • Chloride and carbonation barrier.
  • Formulated blow hole filler.
  • High compressive strength.
  • High frost resistance.
  • Vertical and horizontal applications.

General information


Easy to mix and apply

Excellent bond to concrete without priming

Chloride and carbonation barrier

Formulated blow hole filler

High compressive strength

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Uniclass 2015

Pr_20_31_53_15 Concrete repair mortarsPrimary


C42/320 Levelling/ smoothing coats

Specification data - Concrete repair mortars

Product Reference

Renderoc ST 05

Standard product features

Technical properties:

  • Bond strength by pull off (to BS EN 1542): 2.8 MPa.
  • Chloride ion content (to BS EN 1015-17): 0.01%.
  • Compressive strength (to BS EN 12190): 13 MPa (1 day), 26 MPa (3 days), 37 MPa (7 days), 50 MPa (28 days).
  • Flexural strength (to BS 6319-3): 11 MPa (28 days).
  • Reaction to fire (to BS EN 13501-1): Class A2 s1 d0.
  • Setting time: 60 minutes.

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