Underground pipe joint with hydratable cement in polyurethane ga

Details Underground pipe joint with hydratable cement in polyurethane ga Underground pipe joint with hydratable cement in polyurethane ga

1978-11-27

1981-05-19

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277227, F16J 1510, F16J 1538

Patent

active

042680476

ABSTRACT:
This disclosure teaches a system for placing structurally an inorganic alkaline sealant (such as portland cement) by dispersing the alkaline sealant in a polyurethane foam material. The foam material may be cast and fabricated into bands, gaskets, joint packings and other structural elements which are placed in locations such as joints, cracks or the like where they are needed for sealing or protective functions. The alkaline sealant forms a rocklike mass when exposed to water and also releases alkalinity so as to protect adjacent metal surfaces. Gradual release of the alkalinity sustains protection of the metal surfaces for an extremely long time.

REFERENCES:
patent: 3897073 (1975-07-01), Swanson et al.
patent: 3909010 (1975-09-01), Swanson et al.

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