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A piston seal for sealing a high pressure hydraulic cylinder includes a rigid seal ring, an elastomeric energizer ring, and a mask structure. The mask structure is effective in decreasing explosive decompression of air entrapped under the surface of the elastomeric energizer ring that causes pitting

A piston seal for sealing a high pressure hydraulic cylinder includes a rigid seal ring, an elastomeric energizer ring, and a mask structure. The mask structure is effective in decreasing explosive decompression of air entrapped under the surface of the elastomeric energizer ring that causes pitting and deterioration of the elastomer of the energizer ring by masking the energizer ring material from harmful ingress and egress of air.

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A piston seal for sealing a high pressure hydraulic cylinder includes a rigid seal ring, an elastomeric energizer ring, and a mask structure. The mask structure is effective in decreasing explosive decompression of air entrapped under the surface of the elastomeric energizer ring that causes pitting

A piston seal for sealing a high pressure hydraulic cylinder includes a rigid seal ring, an elastomeric energizer ring, and a mask structure. The mask structure is effective in decreasing explosive decompression of air entrapped under the surface of the elastomeric energizer ring that causes pitting and deterioration of the elastomer of the energizer ring by masking the energizer ring material from harmful ingress and egress of air. opy structure of claim 1, wherein said sheet includes an elongate sleeve structure, and said rib and said sheet, when disposed in operative conditions relative to one another, are arranged with said rib disposed within said sleeve structure. 4. The canopy structure of claim 3, wherein said rib is confined by and captured in said sleeve structure. 5. Canopy structure for creating, selectively and removably, a free-standable, temporary, substantially completely overcovering canopy over a selected article, such as a food article, comprising an elongate, broad ribbon of a thin, flexible and drapeable canopy sheet material formed into an elongate roll having and curled about an elongate roll axis which is generally normal to the sheet material's long axis, a plurality of elongate sleeve structures formed with said sheet material, and defining there adjacent a plurality of elongate tubular sleeves, and disposed within said sleeves on a one-to-one basis, and carried in said roll as presented to a user, plural, elongate, plastically/elastically bendable, and at least partially shape-self-supporting ribs, each said rib being bendable selectively between selectable rib-end regions to assume and memorize the shape, generally, of a configurationally stable, elongate curving arch which is freely placeable over a selected article, said rib, when so bent and placed, supporting a selected stretch of said sheet material in a vaulting, domed condition that is related to the arch created in the rib between the rib's said selected rib-end regions. 6. The canopy structure of claim 5, wherein said sleeves and received ribs have long axes which are disposed generally parallel to said roll's said roll axis. 7. The canopy structure of claim 5, wherein said sleeves and received ribs have long axes which are disposed generally normal relative to said roll's said roll axis. 8. The canopy structure of claim 1, wherein said rib takes the form of a separated and segregated length portion of an initially longer run of rib material which is initially supplied to a user along with canopy sheet material, and said length portion is one that is length-defined by at least one pair of spaced, pre-formed segregation notches prepared at defined, spaced locations distributed in and along said longer run. 9. The canopy structure of claim 7, wherein said ribs are initially supplied to a user configured in the form of a unitary coil. 10. The canopy structure of claim 1, wherein said canopy sheet takes the form of a separated and segregated length portion of an initially longer run of sheet canopy material which is initially supplied to a user along with rib material, and said length portion is one that is length-defined by at least one pair of spaced, pre-formed perforation lines prepared at defined, spaced locations distributed in and along said longer run. ace. 6. The structure of claim 5, wherein at least one of said panels has an aperture sized to provide access into said enclosed space. 7. The structure of claim 1, wherein said means for retaining comprise at least one section of said sheet releasably folded over said length of material. 8. The structure of claim 7, which comprises at least three of said panels, each being connected at opposite sides to two other of said panels. 9. The structure of claim 8, wherein said connected panels define an enclosed space. 10. The structure of claim 9, wherein at least one of said panels has an aperture sized to provide human access into said space. 11. The structure of claim 1, wherein said length of filiform material comprise a closed loop.