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Combimix® CM 760 Fiber

Fiber-Reinforced Self-Leveling Underlayment
CM 760 Fiber is a high-strength, pumpable, fiber-reinforced self-leveling compound designed for creating durable, flat, and smooth surfaces. Suitable for new construction or renovation, it delivers fast setting, added flexural strength from fiber reinforcement, and compatibility with a wide range of substrates. CM 760 Fiber is not intended as a wear surface but provides a reliable base layer for resilient floor coverings or coatings.

Description

CM 760 Fiber combines calcium aluminate cement with fiberglass reinforcement for enhanced stability and crack resistance. It levels and smooths substrates efficiently with pump or hand application, offering a fast turnaround for covering.

  • Interior use on concrete, lightweight concrete, stone, tile, gypsum, wood, terrazzo, and well-bonded VCT/VAT
  • Exterior use under tile in sweetwater conditions (e.g., patios), but not for constant water immersion
  • Not a wear surface – must be covered by floor coverings or coatings
  • Pumpable or hand-applied for versatile installation
  • Fiber reinforcement reduces shrinkage and cracking
  • Fast setting: walkable in 1–3 hours
  • Coverable with most floor coverings after 24 hours
  • Fire classification A1fl

Approved for use over properly prepared and primed substrates, including:

  • Concrete and lightweight concrete
  • Natural stone, ceramic tile, quarry tile
  • Cement- or epoxy-based terrazzo
  • Gypsum and wood substrates
  • Well-bonded resilient floors (VCT, VAT)

Substrate Requirements

  • Clean, structurally sound, free of dust, grease, or weak material
  • Surface tensile bond ≥ 72 psi
  • Must be primed with PP 600 before pouring
  • Concrete must be ≥ 28 days old; RH ≤ 90% before application
  • Ambient and substrate temperature: 50–77 °F

Packaging

  • 44 lb bags and big bags
  • Shelf life: 6 months unopened, stored dry on plastic-coated pallets

Data Sheets

Technical Data Sheet

Safety Data Sheet