Process for providing a polytetrafluoroethylene coating on the w

Details Process for providing a polytetrafluoroethylene coating on the w Process for providing a polytetrafluoroethylene coating on the w

1981-05-21

1983-01-11

Hoffman, James R.

Coating processes

Solid particles or fibers applied

Interior or hollow article coating

264512, 427238, 427239, B05D 722, B05D 302, B05D 312, B05D 724

Patent

active

043682170

ABSTRACT:
The invention relates to a process for providing an adherent coating of polytetrafluoroethylene (PTFE) on the inner walls of a hollow metal body wherein a flexible membrane is used to form a space between the inner walls of the hollow metal body and the inner walls of a flexible membrane, filling the space with PTFE, compressing the PTFE by deformation of the membrane under isostatic pressure, removing the membrane, filling the inner cavities of the hollow metal body with a substantially incompressible solid substance having fluid flow characteristics and being thermally stable at the temperatures to which the PTFE is to be heated, heating the thus-formed assembly to a temperature above the melting point of the polytetrafluoroethylene for a period of time sufficient for the latter to lose its crystallinity.

REFERENCES:
patent: 2724672 (1955-11-01), Rubin

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