MW400 Bonding Epoxy

Epoxy injections repair a crack in a home’s basement wall by filling the crack with a combination of two components that, when mixed, work two ways: Sealing an existing crack and welding the structure. This method cures and places a seal over the damage while preventing more moisture from getting in. Over time, the performance of the seal is actually more important than the welding itself, as the seal prevents premature deterioration of the foundation reinforcement. Compared to concrete, an epoxy injection provides more flexible strength and better compression – allowing for more of the natural expansion and contraction that homes can endure.

MDTI offers 100% solids moisture insensitive epoxy designed to permanently restore structural strength to cracked concrete. Unique wetting properties allow for maximum penetration.

Epoxy Compliances

  • ASTM C881
  • Type I, II, IV, and V
  • Grades 1, 2, and 3
  • Class B & C

MDTI 400 Epoxy Benefits

  • Moisture insensitive to cure on damp or wet surfaces
  • Easy 2:1 mix ratio
  • No shrinkage
  • Excellent adhesion to concrete, wood, and metals
  • Deep penetrating and tenacious bonding of cracks in structural concrete

Epoxy crack injections are economical and relatively free of hassle. As with all of our products, epoxy offers a great way for a homeowner to protect their investment by preventing new water from entering and damaging their property. The epoxy itself is immensely flexible for any project, available in three levels for viscosity and applicable on most interior or exterior surfaces.

Epoxy injections are often the most cost-effective way to repair a crack in a foundation, provided the crack doesn’t exceed the recommended dimensions. If the damage is too extensive – if the crack is too large or the wall is too bowed – carbon fiber or wall anchors may be a more effective solution.

Installation of Epoxy Injections

Epoxy injection installation is fast, requires the work of just 2-3 team members, and offers minimal disruption – meaning the setup, installation, and cleanup will be quick and easy. Besides the epoxy system, the only tools necessary are a concrete drill, normal hand tools, and materials for cleaning holes and cracks.

With MDTI’s epoxy injection supplies, the process is even simpler: Just mix the two components at a 2:1 ratio to create the paste. Injection ports are inserted every 6-12” and the epoxy is injected into the crack. After all the ports are filled, the epoxy is left to cure for an average of seven days to completely harden.

  • Surface preparation: Surface must be clean and sound. Remove all dirt, grease, wax, curing compounds and other foreign matter. Remove water and dust from all surfaces with an oil free air blast prior to application.
  • Mixing: Mix each component separately before blending two Parts A with one Part B by volume in a clean pail. Mix thoroughly for 2 minutes with a low speed drill. Mix only the quantity that can be used within 20 minutes. If using automated or manual injection equipment, do not allow mixed material to reside in static mixing head for more than 15 minutes or blockage may result.

Epoxy Application

As carbon fiber bonding agent: using a small thin nap roller, apply a coat of #400 approximately 1 inch wider than fabric, lay fabric up over crack with fabric toes at a 90 degree angle from crack. Using roller from the middle of the fabric, roll out all air pockets. Apply a second coat of #400 over the entire fabric area. Allow to cure.

Limitations & Precautions

  • Temperature of substrate must be above 40° F.
  • New concrete must be at least 28 days old.
  • Do not thin, solvents prevent proper cure.
  • Do not seal exterior slabs on grade.
  • Component A Irritant: Prolonged contact with skin may cause irritation.
  • Component B Corrosive: Contact with skin may cause severe burns. Avoid eye contact. Product is a skin sensitizer. Use safety glasses and gloves. Avoid breathing vapors. Use adequate ventilation. In case of skin contact, remove any contaminated clothing. Was area of contact with soap and water. For eye contact, flush immediately with plenty of water for at least 15 minutes. Contact physician immediately.

Epoxy Storage

MW400 should be stored in a dry environment between 60-80° F. Unmixed material may crystallize if exposed to temperatures below 60° F.