Abstract
Formaldehyde release from building products is primarily due to incompletely reacted urea-formaldehyde resin (UFR) in particleboard, medium density fiberboard (MDF), and plywood. Formaldehyde is also released from urea-formaldehyde foam insulation (UFFI) that was popular during the 1970s for retrofitting building envelopes. Results of our test of commercial adhesives and UF-bonded wood products show that current state-of-the-art products yield air chamber test values below 0.25 mg/m 3 immediately after manufacture and are capable of meeting 0.12 mg/m 3 indoor air standards at the current product ratio unless these products are used in places where they are exposed to high temperature and humidity. In mobile homes placed in severe climates, wall-temperature profiles show large seasonal and diurnal variations that cause large changes in formaldehyde indoor air levels. Our work shows that diurnal formaldehyde levels may change by a factor of 5 during a 24-h period. Therefore, formaldehyde exposure levels in mobile homes depend on daytime conditions.
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