Polyurethane smells like gas. I called the local gas utility and they sent a tech out. I also have been told that moisture is not good for the oil based polyurethane curing process. An allergic reaction to polyurethane will ignite a bout of health symptoms in those who are exposed to this chemical agent in wood flooring especially if the new wood floors are off gassing polyurethane into the air. If you would like to use the new mattress but the off gassing smell persists you can add a mattress cover to help contain the chemical smell to the bed.
Polyurethane is a versatile polymer used in a variety of products such as foam plastics fibrous materials and adhesives. But people often complain about its distinct strong smell. Suddenly my gas rangestove emits a kerosene like odor when i operate the stove and especially when i operate the oven but our service is natural gas. One of the most common complaints about polyurethane foam however is that it often carries with it a distinct unpleasant smell.
When you remove the cover to wash it you will likely smell the off gassing odor again though it should dissipate over time. The tech said there were no leaks. I also understand that opening the doors and letting air flow can help remove the odor faster. Polyurethanes merits include resistance to tears load bearing capacities and resistance to weather.
Polyurethane foam is an increasingly popular material being used in mattresses and cushions for many pieces of household furniture.