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Can you develop a flexible membrane for polyurethane foam?
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50 months ago
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Reticulated polyurethane foam is a porous, lightweight solid foam, with few intact bubbles or cell windows. It is commonly used in filters, fuel tank inserts, and loudspeaker covers.

We want to apply a regular, flexible membrane to the edge surfaces of reticulated polyurethane foam pieces, approximately 100mm x 100mm squares and 100mm diameter rounds with a height of 25mm. The membrane must be thin (less than 0.25mm in thickness), permeable, and flexible. The foam and frame should be able to be compressed and allowed to recover to the original shape and resistant to water without the membrane detaching. See the video included here and the attached photo under "Additional Materials" at the bottom of this page, showing an example membrane.

In the video, note how the edge must remain intact through application of a water based slurry and being squeezed.