VOC (Volatile Organic Compounds)

Understanding VOCs in Concrete Coatings

VOCs, or volatile organic compounds, are the solvents in a paint or coating that evaporate into the air as the product dries and cures. Older solvent based epoxies and sealers relied on these solvents to stay liquid enough to apply, then released them into the air on the job site. That off gassing is what produces the strong “new epoxy” smell contractors and building occupants notice for days after a coating goes down.

How VOC Limits Are Regulated

In the United States, the EPA’s Architectural and Industrial Maintenance Coatings Rule caps most floor coatings and concrete sealers at 400 grams of VOC per liter. Many states and air quality districts, along with several Canadian provinces, set stricter local limits on top of the federal number. A product legal to sell in one region can be over the limit in another, so contractors working across state or provincial lines need to check the technical data sheet before ordering material.

Low VOC and Zero VOC Options

100% solids epoxies contain little to no solvent carrier, so they come in naturally low on the VOC scale. Water based epoxies and many modern polyaspartic and polyurea topcoats are formulated to meet low VOC rules while still curing into a hard, durable film. These options have largely replaced older solvent heavy coatings in states with tight air quality rules.

Why VOCs Matter on the Job

Beyond legal compliance, VOC content affects how a job site is run. Higher VOC coatings need more ventilation, longer waits before a space is safe to reoccupy, and more caution around ignition sources during application. For occupied buildings like schools, offices, or restaurants, choosing a low VOC system can be the difference between finishing the project on schedule and a client shutting the job down over fumes.