... OEM experience 4 vacuum packing, distallation,concerntration JINAN HUADONG BLOWER CO., LTDHDSR-V-80 BrandHuadongModelHDSR-V-80AItemRoots blowerTypeHDSR vacuum ... vacuum packing, vacuum metallurgy, vacuum distillation, vacuum concentration and vacuum drying, smelting, off-gassing, rolling as well as chemical, food, ... at sightDelivery time: within two weeks three lobe air blower for vacuum packing