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Polymer Concrete Manholes
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P3 Polymers uses next generation polymer science to solve centuries old problems. We manufacture cost-effective, environmentally friendly, and long-lasting polymer concrete structures to modernize our crumbling infrastructure and eliminate the need for costly maintenance and rehabilitation.

The threats to Concrete Manholes

Corroded Manhole Illustration

Biogenic Sulfide Corrosion, also referred to more broadly as Microbial Induced Corrosion (MIC), is likely the most severe threat to concrete manholes. It is caused by certain bacteria that thrive in sewer lines and manholes. This bacteria feeds on the untreated sewage and produces hydrogen sulfide gas as a byproduct. The hydrogen sulfide gas is what causes the characteristic rotten egg smell that often emanates from manholes. This gas reacts with moisture inside the manhole to form sulfuric acid, which steadily corrodes the concrete surface.

It is estimated that Biogenic Sulfide Corrosion causes the average concrete manhole to lose over an inch and a half of wall thickness from corrosion over the course of one decade. The United States spends $14 billion a year combatting the effects of Biogenic Sulfide Corrosion.

Click here to learn more about biogenic sulfide corrosion

Use our Concrete Manhole Lifespan Calculator to estimate how long a manhole can withstand these threats, and how much it will cost to keep operational. 

The Polymer Concrete Solution

Polymer Concrete Manhole Installation

Polymer Concrete Manholes and Wet Wells have excellent resistance to all chemical and physical threats. P3 Polymers uses a custom formulated vinyl ester resin and a carefully designed blend of inert mineral fillers so that our polymer concrete is as resilient as possible. We back all of this up with our 50-year corrosion warranty.


The vinyl ester resin we use has a significantly higher resistance to chemical attack than the industry standard polyester, and our aggregate blend features grains with the optimal size and shape for an interlocking, high-strength matrix. Our polymer concrete is completely non-porous to eliminate the risks of freeze-thaw or ion penetration, and the chemical resistance of the resin entirely prevents biogenic sulfide corrosion.

Click here to learn more about vinyl ester vs polyester resin

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