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800 Series Spin-Glas Ultra is JM’s 800 Series Spin-Glas fiberglass board with a new jacketing offering. The jacket has a polypropylene coating (poly-top). Now, 800 Series Spin-Glas has an exact matching tape, Spin-Glas® Ultra Polypropylene Scrim Reinforced Tape, designed to provide a vapor barrier seal on JM’s 800 Series Spin-Glas Ultra fiberglass board insulation.