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Impermax EP manholes on wet wastewater concrete
Impermax EP manholes are a named epoxy lining. They are not a polyurea roof and not a floor body.
Specify Impermax EP manholes when the structure is buried and wet. Impermax EP (thixotropic two-component epoxy, 100% solids) is written for interior lining of manholes and other buried structures without support movement. Krypton magazine NUM.3 (March 2023) names biogenic acid attack from wastewater.
What Impermax EP manholes actually are
Catalogue 2026 prints Impermax EP as compatible with wet concrete (not standing water) and with high chemical resistance in continuous contact with wastewater. NUM.3 adds that it needs no prior priming, in a single high-thickness coat, horizontal or vertical, because of its thixotropy. Once cured it is a continuous, watertight seal. Keep that chemistry on this name. Do not move it onto Polyurea Rayston (pure polyurea).
However, Krypton ProLine CH55 is a different chemical lining. Purification plants on this site may schedule Polyurea Rayston, Impermax EP or CH55 — pick the name the application page already uses. Thickness stays on the current TDS.
See Krypton ProLine CH55, purification plants, liquid containment and documents. Area is sized on the calculator.
Outbound reference: CEN-CENELEC — EN 1504-2.
A manhole is not a stadium stand. Keep Impermax EP on the buried wastewater lining.
Therefore mix ratio stays on the sheet. First name the wet concrete. Next name the epoxy. Also keep this card off a 1K roof.
These notes do not replace the current TDS, SDS or a written specification. For pack sizes, mix ratio and kg/m², read the current sheet, then the calculator.