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Metzger/McGuire MM-80 | Concrete Floor Joint Filler that Fills and Protects

Metzger/McGuire MM-80 Product Data Sheet


MM-80 is a two-component, 100% solids content epoxy joint filler. When cured, MM-80 is a gray, semi-rigid (hard but slightly resilient) filler with a Shore hardness of A90-95.

Related Products:
MM-80 is available in two versions; MM-80 with the original 5:1 ratio, used primarily for manual dispensing, and MM-80P, with a 1:1 mix ratio, intended for use in dual-component mechanized pumps.

Basic Use:
MM-80 was developed to fill and protect joints in industrial concrete floors that are subject to hard wheeled material handling traffic and heavy loads. Its primary function is to support such traffic and protect joint edges. MM-80 is designed for use in areas where final temperatures are from 40˚F (10˚C) to +120˚F (49˚C). It is also ideal for joint and crack repair.

MM-80 is not designed for use in:

  • True expansion/isolation joints
  • Exterior joints (paving, etc.)
  • Joints exposed to extreme chemical exposure
  • Joints under VCT/seamless floor coverings (in most settings)

As with most semi-rigid joint fillers, MM-80 may discolor if subjected to UV rays from certain types of lighting systems.

Correct Joint Design/Installation
MM-80 should be installed full joint depth in saw-cut control joints (or 2” minimum in joints where depth exceeds 2”) per PCA and ACI guidelines. In construction (formed) joints that are not saw-cut, MM-80 should be installed 2” deep. If shrinkage crack is excessive and needs to be “choked off,” it may be sealed with clean, dry silica sand as shown below (contractor’s option).


  • MM-80’s superior formulation yields sufficient rigidity to support loads crossing joints, protecting edges from spalling, and sufficient resiliency to prevent brittleness throughout the floor’s life.
  • MM-80 exhibits low range tensile and adhesive strengths, characteristics necessary to allow the joints to open as the concrete shrinkage progresses.
  • MM-80’s relative hardness has been gradually increased through the years to reflect increasing demands on floors created by heavier loads and smaller, harder vehicle wheels.
  • MM-80 is the joint filler upon which ACI and PCA standards are based. You can specify and use MM-80 with the confidence that comes from a project-proven track record of more than thirty years, and with the knowledge that you are relying on the best floor joint protection available in the industry.

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