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Sherwin-Williams


Problem Solving Forum

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February 21 - February 27, 2016

Alternatives to coal tar epoxies in wastewater/sewage applications have been in service for a number of years. From experience, which coating types with what fillers at what thicknesses (over steel) have performed best?

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Selected Answers

From Todd Theis of Gulf Coast Paint Mfg., Inc. on November 7, 2016:
I would recommend a cycloaliphatic epoxy, applied in 3 coats at 7-10 mils DFT per coat.

From Anthony Koontz of Sherwin Williams on October 20, 2016:
I suggest a solvent-free elastomeric polyurethane at 60-80 mils dry film thickness.

From Tom Schwerdt of Texas Department of Transportation on May 12, 2016:
Why would you switch from coal tar epoxy to coal tar urethane? Coal tar is unpleasant to work with and a carcinogen.

From Robert Olmstead of Olmstead Business Services International (OBSI), LLC. on May 6, 2016:
I am aware of many waste treatment/sewage plants going back to 1989, both domestically and internationally, that have successfully specified and maintained ongoing use of 2 coats of coal tar urethane (CTU) at 10-12 mills DFT per coat, on concrete clarifiers and similar structures. The coating is based on a single-component, moisture-cure urethane (MCU). On steel they use same spec over a MCU zinc or MIO Zinc (micaceous iron oxide) combination primer, at 2-4 miles DFT. They also use the same zinc primer under a MIO-rich intermediate (3-5 miles DFT) with an aliphatic MIO-rich MCU topcoat (2-4 miles DFT) for areas above the water/sludge line for severe chemical and abrasion resistance. The  material is conventionally applied. It must be high solids (>62% solds by volume) and VOC-compliant in all 50 states. These systems are well established and readily available in the marketplace.

From bart de cremer of acotec on April 25, 2016:
i suggest a solvent-free epoxy with a DFT of 1000 microns, a proven one-layer coating system to be applied by brush and airless spray with single- or plural-pump type Graco or Wiwa.

From Feng Min of Andritz Hydro on April 22, 2016:
I suggest a vinyl ester resin with glass flake filler at 300-1500um.

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Tagged categories: Coal tar epoxy; Coating types; Sewer systems; Steel; Wastewater Plants


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