A method for measuring volatile organic compounds includes loading glass containers into an oven, heating the oven, purging the oven with dry clean air, collecting a volumetric portion of an oven exhaust, trapping volatile organic compounds from the volumetric portion, and measuring the volatile organic compounds trapped in the trap. The one or more glass containers are in-tact while measuring the VOCs of the coated glass container. An apparatus includes an oven having an interior volume that is capable of holding one or more in-tact glass containers, a flow meter fluidly connected to the first trap, and a pump fluidly connected to the flow meter. The first trap collects volatile organic compounds from a volumetric portion of the oven exhaust gas. The pump controls a flow rate of the volumetric portion of the oven exhaust gas across the first trap.