The Mass Mixer is designed for uniformly mixing of dry and wet material and especially suitable for powder of Pharmaceuticals, Food, Herbals, Agro Chemicals & Chemicals. Specially designed self adjusting sealing arrangement of unique design is provided to ensure that no black particle enters into the mixing drum. The material under mixing process can be monitoring through acrylic dust cover and its controls dusting and contaminations. The tilting device is provided to make easy the unloading of the material and easy cleaning of the mixing drum.