FLOWLOCK / Concrete Repairs / Flowlock SRM R4 7220

Flowlock SRM R4 720 - Structural Concrete Repair Mortar

Flowlock SRM R4 720 Structural Repair Mortar is a rapid cure, polymer-modified, fibre reinforced structural repair mortar for applications up to 40mm thickness per layer.

The Microsilica content creates high resistance to chemical attack and the 3-4 hours typical cure time gives good workability for detailed applications

  • Large range of structural concrete repair applications up to 40mm per layer (successive layers permitted)
  • Repair and maintenance of buildings damaged by aggressive environments, such as sulphates, acid rain, atmospheric pollution etc
  • Repair of structural concrete damaged by the effects of carbonation
  • Structural concrete repair affected by corrosion of reinforcements in marine environments
  • Single Component - mix only with water
  • Odourless
  • 3-4 hours typical cure time gives good workability for detailed applications
  • Microsilica content in the cement base provides very good resistance to chemical attack, including sulphates
  • High resistance to carbonation penetration
  • Very high mechanical strength and impact resistance
  • Good viscosity allows applications in successive layers
  • Fibre reinforced for additional strength

Our Systems


Solvent-free, Odourless Solutions

Metal Cut Edge Corrosion Treatment

Gutter Waterproofing

Pitched Metal Roofs & Cladding Coating

Refurbishment Flat Roof Waterproofing

Rooflight Refurbishment

Short Term Roof & Gutter Repairs (5-10 years)



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