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CSS-CM Cementitious Matrix

CSS-CM is a one-component, shrinkage-compensated, polypropylene-fiber reinforced cementitious matrix designed to be field installed with CSS-UCG, CSS-BCG and CSS-HBCG carbon grids to create a fabric-reinforced cementitious matrix (FRCM) composite for structural reinforcement applications. Used without carbon grids, CSS-CM functions as a high performance, sprayable repair mortar. This product has been evaluated per ICC-ES AC434 for concrete and unreinforced masonry strengthening using fabric-reinforced cementitious matrix (FRCM) and steel reinforced grout (SRG) composite systems. This product is part of the tested assembly in UL Design No. N859, which achieved a four-hour fire rating when subjected to ASTM E119 / UL 263 full-scale fire testing. Please refer to UL Online Certifications Directory for the UL listing.

Key Features

  • High strength
  • Ambient cure
  • Non-corrosive
  • Molds to fit various shapes
  • Low aesthetic impact
  • Compatible with many finish coatings
  • Sprayable repair mortar
  • Low rebound
  • Long working time
  • UL listed FRCM system
  • Component of Class A flame spread/smoke developed indices test


  • Seismic retrofit
  • Load rating upgrade
  • Damage repair
  • Defect remediation
  • Blast mitigation
  • Concrete restoration

Storage Conditions

  • Store material in a dry area with no exposure to moisture

Shelf Life

  • 1 year from date of manufacture, provided it is well kept


  • 55 lb. (24.9 kg) bag (CSS-CM)

Limited Warranty

  • This product is covered by the Simpson Strong-Tie RPS Product One-Year Limited Warranty, which is available at strongtie.com/limited-warranties or by calling Simpson Strong-Tie at (800) 999-5099


  • Approximately 0.43 ft.3 (0.012 m3) per 55 lb. (24.9 kg) bag

Related Links

Related Literature

Code Reports & Compliance