CHEMSEAL

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Non-metal mechanical seal kits for preventing contamination caused by penetrations passing through rough openings in concrete into clean rooms and other controlled environments, the kits comprising a rigid base ring of rigid structural thermosetting polyurethane in the nature of solid rigid polurethane for bonding to concrete around rough openings through concrete, and a rigid disk shaped cover of rigid structural thermosetting polyurethane in the nature of solid rigid polurethane that is attached to the base ring with mechanical fasteners of metal to position the cover outwardly from a surface of the concrete and cover rough openings through concrete whereby openings can be cut in the rigid disk shaped cover to permit penetrations to pass through the rigid disk shaped cover and through rough openings in the concrete, sold as a unit