Sample Preparation Vessels
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Parr Instrument Company Sample Preparation Vessels - Hydrothermal Synthesis - Acid Digestion - Microwave Digestion - Oxygen Combustion 4700 Designing and Building Quality Pressure Apparatus for 120 Years

Parr Sample Preparation Vessels A complete line of pressure vessels designed specifically for preparing laboratory samples for chemical analysis. Acid Digestion Vessels For dissolving or digesting inorganic or organic samples in strong acids or alkalis in chemically-resistant vessels at elevated temperatures and pressures, with complete containment and recovery. See page 3. Microwave Digestion Vessels* For treating either inorganic or organic samples with strong acids or alkalis under heat and pressure in metal-free vessels using microwave energy for rapid dissolution or digestion, with...

Metal Jacket and Microwave Styles • Generate a vigorous chemical action which is a great time saver in analytical procedures. • Obtain complete digestion or dissolution of samples which react slowly or incompletely when treated by other methods. Chemists who have worked with sealed glass tubes and other cumbersome digestion devices will recognize the attractiveness of these convenient digestion vessels. Dissolve Inorganic Samples Ores, rock samples, glass and other inorganic materials can be dissolved rapidly in Parr Acid Digestion Vessels using strong mineral acids: HF, HCI, H2SO4, HNO3,...

< Styles, continued from previous page its enclosure when these vessels are heated and cooled. To compensate for this difference and to maintain a constant loading on the PTFE seal, all Parr Acid Digestion Vessels have spring-loaded closures which will continue to maintain pressure on the liner seal throughout the operating cycle, and particularly during cooling when PTFE parts would otherwise relax and leak. Safety Blow-Off Discs Safety blow-off assemblies are provided on most Parr Acid Digestion Vessels to protect the vessel and the operator from the hazards of unexpected or dangerously...

The 4749 is a 23 mL, general purpose acid digestion vessel, similar to the original 4745 model but modified for use at higher temperatures and pressures, and provided with safety blowout protection as well. Operating temperatures and pressures up to a maximum of 250 °C and 1800 psig are permitted in this vessel using a thick-walled PTFE liner with a broad, flanged seal. The forces required to seal the liner are developed by tightening the vessel cap with a spanner while holding the vessel in a special fixture. A safety rupture disc in the vessel head is designed to blow out and release the...

4744 General Purpose Vessel 4746 & 4747 High Pressure Vessel Volume: 45 mL Working Pressure: The 4744 is a 45 mL modification of the 23 mL, 4749 PTFE lined vessel designed for users who want additional capacity in this popular model. It is made with the same closure as the 23 mL vessel, using a similar thick-walled PTFE cup, 3-3/4" deep inside, with a broad flanged seal. Safety blow out protection is provided with a blow-off disc which will release pressure through an opening in the cover. It's maximum temperature and pressure ratings, 250 °C and 1800 psig, are the same as for the 4749...

4748 & 4748A Large Capacity Vessels Volume: 125 mL & 200 mL The 4748 and 4748A Vessels are the largest of all Parr Acid Digestion Vessels. The 4748 has a 125 mL, removable PTFE cup in a stainless steel body with six cap screws in the screw cap to seal the flanged PTFE cup. An expandable wave spring maintains continuous pressure on the seal during the cooling cycle when PTFE parts might otherwise relax and leak. Stirring can be provided with a magnetic stir bar. The 4748A is a 200 mL modification of the 125 mL, 4748 PTFE lined vessel for users who want additional capacity in this model. A...

Microwave Digestion Vessels* Provide: • Fast digestion times. • Complete containment of volatiles. • Freedom from metal contamination. In addition to unique acid digestion vessels, Parr offers a line of chemically inert vessels in which microwave heating can be used for rapid sample dissolution in a sealed vessel. These vessels can be placed directly in a microwave oven for specific, high speed heating to drastically reduce the time required to dissolve or digest an analytical sample. They are made in two sizes which can be heated in any of the commercial microwave ovens regularly offered...

Unique Safety Features Several unique sealing and safety features have been incorporated into the design of these vessels. The PTFE sample cup is closed with a self-sealing, PTFE O-ring which eliminates the need to pre-load the cup in order to secure a tight seal. This also eliminates the effects of differential thermal expansion during heating and cooling cycles while providing a chemically inert, all-PTFE system. For overpressure protection, the closure in these vessels includes a compressible relief disc which operates in conjunction with the O-ring cup seal to release any excess...

Loading Limits for Samples The amount of sample and digestion aid which can be treated in a 4781 or 4782 Microwave Vessel must not exceed the following amounts: Digestion aids commonly used with inorganic samples include: aqua regia, hydrochloric, hydrofluoric and sulfuric acids. Digestion with perchloric acid can be dangerous and must not be used. Convenient Hand Closure P arr Microwave Vessels are closed by simply turning a knurled cap until it is hand tight. No wrench or spanner is required. The PTFE O-ring attached to the cup cover will develop and maintain a tight seal without heavy...

The references listed in the adjoining column describe procedures involving metal-jacketed acid digestion vessels. Any attempt to transfer these procedures to a microwave digestion vessel will require careful adjustment of the vessel charge and the heating time. Assumption of Risk The Parr Instrument Company offers these Microwave Digestion Vessels to the skilled analytical chemist as an attractive means for preparing samples for analysis. These vessels are designed, tested and manufactured with great care to be as effective and safe as possible in their intended application. However, since...