Answer: The production of Owens Corning batt insulation does include the use of formaldehyde. From the time fiber glass insulation was invented manufacturers have used formaldehyde as a binder ingredient in the manufacturing process to help glue or "bind" the glass fibers together. The trace amounts of formaldehyde found in both traditional and so-called "formaldehyde-free" insulation do not present health concerns. Owens Corning fiberglass insulation is certified to be low emitting by GREENGUARD, an independent testing lab. You can find more information on their indoor air quality testing standards at www.greenguard.org. For more on the facts about formaldehyde and insulation, click here.