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General Purpose Acid Digestion Vessels, Parr

Description 

Model 4745 (23mL) is a PTFE lined metal vessel of simple design and minimum cost that can be used safely for routine sample preparation purposes. Its an excellent design for general digestion procedures in which temperatures and pressures are held below 150 °C and 1200 psig. It can be used occasionally above 150 °C, but at elevated temperatures it becomes increasingly difficult to maintain a tight seal.

This vessel does not have a safety rupture disc, but it is designed so that the bottom plate will shear out and release the charge if the vessel pressure should exceed 7000 psig. This ‘weak link’ design, while effective in preventing a lateral burst which might injure a bystander, is not an adequate substitute for a frangible rupture disc as provided in other Parr designs. For this reason, the 4745 Vessel is not recommended for experimental procedures in which explosive pressures may be generated.

Model 4744 (45mL) is a modification of the 23 mL, 4749 PTFE lined vessel 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 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, 250°C and vessel 1800 psig, are the same as for the 4749 Model. The 4744 Vessel is sealed by turning the screw cap down until it is hand tight, then tightening the cap not more than one-eighth turn with a hook spanner. The spanner and holding fixture required for this operation are the same as used with the 4749 Vessel. These accessories must be ordered separately.


General Purpose Acid Digestion Vessels, Parr
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Product NumberDescriptionPackagingQtyPrice
16-6944-0145mL General Purpose Acid Digestion VesselEach
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$735.73
16-6944-0223mL General Purpose Acid Digestion VesselEach
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$583.86

 

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