7
Parr Instrument
Sample Preparation Bombs
4748 LARGE CAPACITY BOMB
125 mL - 250 °C
1900 psig
T
he 4748 bomb is the largest of all Parr acid digestion bombs. It has a 125 mL,
removable Teflon cup in a stainless steel body with six cap screws in the screw cap to
seal the flanged Teflon cup. An expandable wave spring maintains continuous
pressure on the seal during the cooling cycle when Teflon parts might otherwise relax and
leak. Stirring can be provided with a magnetic stir bar.
Temperatures and pressures in the 4748 bomb should not exceed 250 °C and 1900 psig,
and held well below these limits whenever possible. It also is advisable
to test any new procedure in one of the smaller bombs before scaling
up to this size. If recommended procedures are not followed and
excessive pressure develops in the bomb, a metal disc above the Teflon
cover will rupture at approximately 3500 psig, releasing the charge
through an opening in the cover. A wrench for the cap screws is
furnished with the bomb. No other accessories are required.
ORDERING INFORMATION
4748
Acid digestion bomb, 125 mL
A305AC
Replacement Teflon cup with cover, 125 mL
310AC
Corrosion disc, .001”, T347SS
311AC
Rupture disc, .0025”, Inconel
Bulletin 4700
Size, mL
23
23
45
23
125
Maximum charge, grams,
Inorganic sample
1.0
1.0
2.0
1.0
5.0
Organic sample
0.1
0.1
0.2
0.1
0.5
Maximum Temperature, °C
Recommended
150
250
250
250
250
Absolute
250
Maximum pressure, psig
Absolute
1200
1800
1800
5000
1900
Body Material
Stainless Steel
Cup seal
Tapered
Flanged
Flanged
Tapered
Flanged
Rupture disc
No
Yes
Yes
Yes
Yes
Closure style
Hand Tighten Spanner Wrench Spanner Wrench Hand Tighten Six Cap Screws
Bomb dimensions, cm
Height overall
8.45
8.45
13.53
12.70
15.2
Maximum O.D.
6.05
6.35
6.35
8.41
9.52
Cup dimensions, cm
Inside diameter
3.10
2.64
2.64
3.10
4.45
Inside depth
3.09
4.37
9.50
3.09
8.25
Bomb weight, grams
965
1020
1430
3700
3750
Acid Digestion Bombs Specifications
Indicates specifications that change within models
Model Number
4745
4749
4744
4746
4748
