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Cell Pak uses 100 percent recycled newsprint to provide high quality, light density, blown-in cellulose insulation. Cell Pak cellulose insulation is blown into your attic and walls to form a protective, air tight blanket. Since cellulose is versatile and maneuverable, it seals around plumbing and electrical outlets to form an air tight fit. It also provides a 3.8 R-value per inch in sidewalls. The insulation contains boric acid as a fire retardant. The company is an Energy Star partner.