Classification Information
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 including a base ring of structural thermosetting polyurethane for bonding to concrete around rough openings through concrete, and a disk shaped cover of structural thermosetting polyurethane that is attached to the base ring with mechanical fasteners to cover rough openings through concrete, sold as a unit
Nonmetallic Building Materials