Economical, small scale, sublimation apparatus. Crystals form in the cone and are easily removed through the vacuum connection at the top. The unique design allows the user to submerge the flask in an oil bath almost to the bottom seal on the cooling jacket thereby avoiding premature condensation. 25 mL size has a 34/45 joint; 50 mL size has a 45/50 joint. Vacuum tube on both sizes will accommodate 10 mm I.D. tubing.