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PENNCOAT™ 331/331 MR Lining

30 mil Flake Filled Novolac Vinyl Ester Lining

PENNCOAT 331 is a 30 – 35 mil lining system based on premium grade novolac vinyl ester resin polymer chemistry. It utilizes a peroxide based curative for maximum chemical resistance, as well as flake fillers for reduced permeation. For chemical containment applications it is applied in two coats of 14 – 16 mils WFT per coat. A third coat may be applied where a thicker lining is desired. For spray applications or immersion service such as a tank lining, PENNCOAT 340 may be specified, which is applied by spray in two coats of 22 – 25 mils WFT per coat for a total lining thickness of 38 – 40 mils DFT. When the crack bridging advantages of a glass mat reinforcement are desired, the optional PENNCOAT 331 MR (Mat Reinforced) may be specified, which utilizes a 1 oz chopped strand glass mat reinforcement in the primer layer. Consult Corrosion Engineering specification CES-259 for complete installation details.


For use as a concrete lining within its chemical limits for foot and light fork truck service, and chemical splash and spillage. It is suitable for both interior and exterior applications. PENNCOAT 331 is ideal as a secondary containment lining.

PENNCOAT 331 Lining can be used as an immersion service tank lining within its chemical and thermal limitations.

PENNCOAT 331/331MR is also suitable as an internal lining to protect ductwork, stacks, and associated air pollution control and flue gas conveying equipment from corrosive acids and fumes.

  • Excellent resistance to acids, alkalis, and solvents.
  • PENNCOAT 331/331MR is flake filled, resulting in significantly improved permeation ratings compared to non flake filled systems.
  • PENNCOAT 331 MR utilizes a chopped strand glass mat reinforcement in the primer layer to minimize crack transmission from the substrate.  • Installed easily by brush, roller or spray.

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