Now 10g, 20g,40g/hr all air cool ozone cell with ceramic board can be only made by our company in China. Our  technic of this ozone item can be similar to the MITSUBISHI Japan laboratory's. The technic of it is the same with Dell American, but the price of Dell ozone item is more than 10 times than thiers. The material of plastic board 20g/hr is polyfluortetraethylene and 304 polyfluortetraethylene of connection between ozone air and plastic.