The 4744 series is an instrument manufactured by Parr Instrument Company. It is a general purpose acid digestion vessel for users who want additional capacity in the model. It is made with the same closure as the 23 mL vessel, using a similar thick-walled PTFE cup, 3-3/4 inches deep inside, with a broad flanged seal. Safety blow out protection is provided with a rupture disc that will release pressure through an opening in the cover. Its maximum temperature and pressure ratings is 250°C .
Organic samples can be treated with nitric acid and other oxidizing acids in the vessels with no difficulty, provided that certain safety precautions are observed. Alkaline or acid hydrolysis reactions can also be handled equally well.