The double cone blender consists of two cone shaped sections with 45˚ slope. The cone section is welded at their wide ends to a Centre band. The blender is mounted between two trunnions that permits the unit to tumble end over end. In operation, material is loaded to a fill level of 50 to 60% of the blender’s capacity. The blender tumbles and the material in the vessel spreads out. The transition area at the band between the cones prevents the material from siding along the inner wall and instead causes the material to fold over itself this provides gentle mixing with only very slight shear. The blender is ideal for powders of granules that degrade by attrition. The smooth transition area in the vessel also simplifies cleaning because there are no areas to trap particles and cross-contaminate batches. Contra rotary baffles with mechanicals seals of both ends can be provided for critical mixing applications.