Cutback asphalt is essentially an asphalt cement and petroleum solvent mixture. Cutbacks, like emulsions, are used to decrease asphalt viscosity for lower temperature applications (tack coats, fog seals, slurry seals, stabilization material). They also increase air flow and water drainage through the asphalt pavement. The solvent in a cutback will evaporate over time leaving only the solidified asphalt cement behind. Solvent-based cutbacks include methyl ethyl ketone, methyl isobutyl ketone, propylene glycol monomethyl ether, and dipropylene glycol monomethyl ether. These chemicals are toxic and flammable. They can be released into the soil when they break down. They may also be released into water when they enter storm drains or get spilled on the ground. They can cause serious health problems if you eat any of the contaminated plants that grow in areas where these chemicals have been dumped. Water-based cutbacks include dibutyl phthalate, di(2-ethylhexyl) phthalate, and dimethyl phthalate. These chemicals are found in many products around the home and workplace, such as plastic toys, food packaging, flooring materials, medical devices, and furniture upholstery. When they come in contact with moisture, such as from your child's wet diaper, they release into the environment.