Roberts Oxygen in Gaithersburg Manufacturing Dry Ice for Pfizer Vaccines To ensure that the Pfizer vaccine doesn’t spoil, it needs to be kept extremely cold. One company in Gaithersburg, Roberts Oxygen, is doing its part to help keep the vaccine safe by manufacturing dry ice. Reggie Wright, the regional sales manager for Roberts Oxygen, explained how dry ice—which is 109 degrees below Fahrenheit—is manufactured. “We pick up liquid CO2 from multiple sources in a trailer, we feed it into a bulk tank for storage, the bulk tank feeds into the dry ice machines we have here in Gaithersburg. That machine takes liquid carbon dioxide, compresses it, lowers the pressure, and turns it into solid carbon dioxide which is dry ice,” Wright explained.