(KANSAS CITY, Mo., Feb. 27, 2006) Tnemec Company, Inc., Kansas City, Mo., has introduced a new fiber-reinforced modified polyamine epoxy designed to withstand severe wastewater conditions, according to Vaughn O'dea
, technical sales manager, water and wastewater.

Our new Series 436 Perma-Shield FR^TM shares the innovative resin technology found in our Series 434 Perma-Shield H2S and Series 435 Perma-Glaze^TM coating formulations to provide exceptional resistance to H₂ S gas permeation and to microbiologically induced corrosion found in severe wastewater systems, O'Dea noted.

Fiber reinforcement adds flexural and tensile strength to Series 436, making it ideal to use in domestic wastewater systems where high abrasion and impact resistance are needed, such as sewer interceptors and wet wells, influent channels, grit chambers, and other headworks facilities, to name a few. Series 436 can also be used in sludge holding digesters, primary clarifiers, and manhole structures where elevated H₂ S conditions are found, O'Dea said.

Series 436 Perma-Shield FR is a spray-applied, high-build liner that provides exceptional new construction and rehabilitative concrete corrosion protection. Where higher H₂ S exposure levels may require thicker film build, the fibers in Series 436 provide reinforcement and dissipate any curing and impact stresses that are typically encountered, O'Dea said.

We have demonstrated through our Severe Wastewater Analysis Test (S.W.A.T.) that Perma-Shield products provide greater hydrogen sulfide permeation resistance than other fluid-applied coatings, and can, therefore, be applied at less than 125.0 mils which the industry now accepts as standard protection thickness.

This allows the use of Series 218 MortarClad, a polymer modified concrete resurfacer, to fill bugholes, voids and other surface irregularities to provide a contiguous surface, followed by Series 436 Perma-Shield FR. Its ease of application is an advantage when labor costs dictate a faster method than trowel-applied epoxy mortars, O'Dea reported.

S.W.A.T. is an accelerated wastewater corrosion testing program conducted by an independent laboratory that applies Electrochemical Impedance Spectroscopy (EIS) technology to evaluate the level of coating degradation after exposure to a simulated severe wastewater testing environment. Using electrical current, we can determine the level of coating degradation when exposed to wastewater headspace conditions. Series 436 coated concrete specimens tested in S.W.A.T. found no blistering, cracking or loss of adhesion after 28 days of exposure, O'Dea added.

A 100 percent solids, solvent-free epoxy, Series 436 Perma-Shield FR demonstrates excellent ASTM performance data for abrasion, adhesion, chemical resistance, flexural strength, tensile properties, impact and water vapor transmission.

Series 436 Perma-Shield FR also represents a less-expensive, seamless alternative to PVC liners due to its lower cost of application. Application using standard 45:1 airless equipment is recommended at temperatures between 55 degrees F (10 degrees C) and 90 degrees F (32 degrees C).

Series 436 has been used on a number of projects across the U.S., including the wastewater treatment plant in Smiths, AL; a digester in Augusta, GA; the Coeur D'Alene Wastewater Treatment Plant in Coeur D'Alene, ID; wet wells in Linden and Walnut Lake, MI; a lift station in Houston, TX; a wet well in Colony, TX; and the Brushy Creek Treatment Plant in Round Rock, TX.

Series 436 Perma-Shield Product Data
Wastewater Project Profiles
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