Water-based bonding adhesives are being increasingly specified and used as replacements for conventional solvent-based bonding adhesives in an effort to reduce volatile organic compound (VOC) emissions. However, water-based bonding adhesives have notable temperature and condition limitations, and NRCA has received a number of reports of problems related to such adhesives.
As part of an effort to achieve federally mandated standards in the Northeast and Mid-Atlantic, the Ozone Transport Commission (OTC) developed model rules for adhesives and sealants that regulate VOC content. Specific states' regulations and implementation timetables vary slightly, but they generally require adhesives, sealants and primers to contain a maximum of 250 g/L of VOCs by Jan. 1, 2012.
Similar VOC limits occur as targets in some voluntary sustainability programs, including LEED.®