Economic Self Leveling Underlayment

VELOSIT SL 501 is a cementitious self leveling underlayment for concrete substrates. It creates a smooth surface for coatings and floor coverings.

Typical applications:

  • Interior and exterior use
  • Leveling of concrete slabs and floors
  • Repair of surface defects on concrete floors
  • Application thickness from 3 mm (1/8”) to 38 mm (1 ½“)


  • Minimal shrinkage/expansion under dry resp. wet curing conditions minimizing the risk of micro-cracking
  • Excellent flow with long slump life
  • Smooth surface profile
  • Fast air release with minimal requirement for agitation
  • Ready for covering with ceramic tiles after 4 hours, for moisture sensitive floor coverings after 16 hours
  • 30 – 40 min. working time and 12 MPa (1740 psi) compressive strength after 4 hours
  • Final strength of more than 30 MPa (4350 psi) after 28 days
  • Open to foot traffic after 3 hours
  • Very good adhesion to properly prepared concrete
  • Good resistance against CO2 and Chloride penetration due to a very tight pore structure
  • Excellent water resistance, no strength loss under water
  • Good weathering resistance
  • Good sulfate resis
  • Light gray color close to concrete color


Here you can find detailed information about the selected VELOSIT product.

Technical Data Sheet Environmental Product Declaration - EPD Safety Data Sheet License EMICODE

Associations & Memberships:

back to top