CRACK-PAC® Injection Epoxy

The Crack-Pac® two-part, high solids, low-viscosity crack injection epoxy is designed to repair cracks in concrete. The mixed adhesive has the viscosity of a light oil and a low surface tension that enables it to penetrate fine to medium width cracks. Resin is contained in the cartridge and hardener is contained in the nozzle. Once the nozzle is threaded onto the cartridge, the hardener is released into the resin-filled cartridge by turning the knob at the base of the nozzle. The two components are mixed by shaking the cartridge.

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Crack-Pac® Injection Epoxy

Dispensing Systems: U.S. Patents 6,737,000 and 6,896,001 B2

Crack-Pac® Kit (ETIPAC10KT)

Crack-Pac® Kit Components

Crack-Pac® injection epoxy is also available in the Crack-Pac Injection Kit. The kit includes everything needed to pressure inject approximately 8 lineal feet of cracks:
  • 2 Crack-Pac cartridge / nozzle sets
  • 12 E-Z-Click Injection Ports
  • 2 E-Z-Click Injection Fittings with 12" tubing
  • 1 pint of paste-over epoxy (8 oz. of resin + 8 oz. of hardener)
  • 4 disposable wood paste-over applicators
  • 1 pair latex gloves
  • Installation video

Crack-Pac® injection epoxy using the E-Z-Click Port System


  • Dispenses with a standard caulking tool, no dedicated dispensing tool needed
  • Low viscosity
  • Clean and easy mixing; no additional tools required
  • Chemically bonds with the concrete to restore strength
  • Resistant to oils, salts and mild chemicals
  • Non-shrink
  • Conforms to of ASTM C 881 Type I & II, Grade 1, Classes B & C


Suitable for repair of cracks ranging from 1/64" to 1/4" wide in concrete walls, floors, slabs, columns and beams. Can be used to inject cracks in dry, damp or wet conditions with excellent results. Not for use in actively leaking cracks. Apply to concrete 40°F or above.

Viscosity (mixed, 72°F)   ASTM D 2393   1,400 cps
Bond strength (moist cure)   ASTM C 882   2,010 psi (2 days)
3,830 psi (14 days)
Water absorption   ASTM D 570   0.082% (24 hrs)  
Tensile strength   ASTM D 638   5,860 psi (7 days)  
Elongation at ultimate ASTM D 638 14.1%  
Compressive yield strength   ASTM D 695   11,270 psi (7 days)  
Compressive modulus   ASTM D 695   318,600 psi  
Linear coefficient of shrinkage   ASTM D 2566   0.002  
Gel time (72°F)   ASTM C 881   2 hours - 60 g mass  
Initial cure (72°F)     24 hours  
Mixing ratio     8:1  
Crack-Pac in use





24 months from date of manufacture, unopened


In order for components to mix properly, the resin and hardener must be conditioned to 60°-80° F before mixing.


For best results, store between 45° F - 95° F


Resin - blue, hardener - clear, mixed: light amber. The color of epoxy will change from amber to blue during the cure process and then fade back to light amber within a few weeks of installation.


Wipe up with cotton cloths. If desired scrub area with abrasive, waterbased cleaner and flush with water. If approved, solvents such as ketones (MEK, acetone, etc.), laquer thinner, or adhesive remover can be used. DO NOT USE SOLVENTS TO CLEAN ADHESIVE FROM SKIN. Take appropriate precautions when handling flammable solvents. Solvents may damage surfaces to which they are applied. Cured material – Chip or grind off surface.


Very good to excellent against distilled water, inorganic acids and alkalis. Fair to good against organic acids and alkalis, and many organic solvents. Poor against ketones.

Crack-Pac® Cartridge System
Crack-PacT Cartridge System

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© 2015 Simpson Strong-Tie Company Inc.