The use of polyurethane foam (PUF)in sealing abandoned mine shafts and adits is now becoming common among govt agencies and mining companies. Has anyone out there used PUF as a light-weight substitute backfill behind retaining walls or in other mining or construction related uses? It seems to me that PUF would work well in drill hole sealing (P&A), but States are reluctant to approve this media.
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Polyurethane Foam (PUF) use other than mine closures
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