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Epoxy and polyurethane are both resins; usually, they are two element formulations. The blending of the parts for every resin type creates the fabric with the requisite properties for crack repairs.  
  
Epoxy's parts are a resin and a hardener; blended collectively earlier than a crack injection. The combo ratio is typically two parts epoxy to at least one part hardener. Injection epoxies typically treatment within three to four hours. Once cured, epoxy has a strong bond and a hard plastic-like texture.  
  
Polyurethane, while not essentially a two element blend, typically has ; one is the resin and the other is an accelerator. Unlike epoxy, the texture of cured polyurethane varies significantly; one can't generalize concerning the properties of cured polyurethane.  
  
Differences in The Epoxy and Polyurethane Crack Injection Processes  
  
There are significant differences in how polyurethane and epoxy crack injections are carried out. Epoxy injections are referred to as "Surface port injections" because they involve the use of injection T-Ports to inject the epoxy into a crack.  
  
Polyurethane injection involves a lot higher injection pressures utilizing packers inserted into drilled holes via the crack in the poured concrete foundation. Like epoxy, the injected polyurethane fills the crack through the complete thickness of the muse thereby preventing water from coming into the crack. Professional polyurethane crack injections typically involve a flushing process to clean the crack to improve adhesion within the crack.  
  
Advantages of Epoxy Crack Injection  
  
1. The tensile strength of cured epoxy is larger than that of poured concrete. Under stress, cured epoxy crack repairs will not yield.  
  
2. Epoxy injections provide positive confirmation to the injection technician that the crack has been utterly filled.  
  
3. Epoxy crack injections are extremely reliable because of their low failure rate.  
  
4. Epoxy's curing time permits the epoxy to gravity feed within the crack, thereby filling all parts of even the finest cracks.  
  
Advantages of Polyurethane Crack Injection  
  
1. Polyurethane can be used regardless of the crack condition and the weather. It doesn't matter if the crack is actively leaking, stuffed with mud and/or mineral deposits, or if it is small or large.  
  
2. Polyurethane injection involves a crack flushing process that cleans out the crack prior to the injection.  
  
3. The chemical expansion of the polyurethane will fill voids within the concrete.  
  
4. The fast curing of polyurethane is useful when rapid waterstopping is required.  
  
Disadvantages of Epoxy Crack Injection  
  
1. Moisture adversely affects the adhesive qualities of the anchoring epoxy used to adright here the T-Ports onto the crack. Without enough adhesion, the anchoring epoxy will not withstand the injection pressure.  
  
2. Epoxy is inappropriate for re-injecting previously injected crack repairs which have failed.  
  
3. Homeowner basement leak repairs with hydraulic cement or caulking render epoxy injections inappropriate because there isn't a longer surface access to the crack, mud and/or mineral has constructed-up in the crack, and the concrete round parts of the crack is commonly damaged by water saturation.  
  
4. The curing time and the available viscosities of epoxy are positive attributes, but also weaknesses. Epoxy crack injection relies on the containment of epoxy within a crack till the epoxy has cured. This containment uses the compacted soil towards the outside wall. Poor compaction, air-hole membranes and the use of epoxies with inadequate viscosity will consequence in the bleeding of epoxy into the soil.  
  
Note: The robust epoxy bond is usually cited as a negative attribute of epoxy crack injections on account of its rigidity. Keep in mind that the entire poured concrete basis is inflexible; therefore, the need for flexibility in the materials used to inject a crack, for my part, is illogical as there isn't any real must accommodate crack movement.  
  
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