6
Parr Instrument
Acid Digestion Bombs
4744 GENERAL PURPOSE
BOMB
45 mL - 250 °C
1800 psig
T
his is a 45 mL modification
of the 23 mL, 4749 Teflon
lined bomb for users who
want additional capacity in this
popular model. It is made with
the same closure as the 23 mL
bomb, using a similar thick-
walled Teflon cup, 3-3/4” deep
inside, with a broad flanged seal.
Safety blow out protection is
provided with a rupture 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
model. The 4744 bomb is sealed
by turning the screw cap down
until it is hand tight, then tight-
ening 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 bomb. These accessories must be ordered separately.
ORDERING INFORMATION
4744
Acid digestion bomb, 45 mL
A280AC2
Replacement Teflon cup with cover, 45 mL
286AC
Corrosion disc, .001”, T347SS
287AC
Rupture disc, .0025”, Inconel
264AC2
Hook spanner wrench
A285AC
Holding fixture
A284AC
Tumbling ring
4746 & 4747 HIGH PRESSURE
BOMB
23 mL - 250 °C
5000 & 3300 psig
T
his is a high strength
acid digestion bomb
with a 23 mL, A255AC
Teflon cup and cover in a
strong outer body which can
be made either of stainless
steel or nickel. The 4746
stainless bomb is intended for
use with nitric, sulfuric or
other oxidizing acids, offering
best resistance to any acid
vapors which might migrate
through the Teflon cup under
high pressures. The 4747
bomb with a nickel body is to be used with HCl, HF and other
reducing acids. Working pressures up to 5000 psi and tempera-
tures to 250 °C can be handled in the 4746 stainless bomb, but
pressures in the 4747 nickel bomb must be limited to 3000 psi
due to the lower physical strength of nickel. The 4746 stainless
bomb has a safety rupture disc which will release through a
passage in the bottom of the bomb. The nickel bomb does not
have a blow-out passage since reactions with reducing acids are
not potentially explosive.
These bombs were developed initially for dissolving nuclear
fuel samples but many other applications with refractory or
highly active materials are indicated. Their heavy construction
will be reassuring when working with mixtures which are poten-
tially explosive or whose behavior is unknown and therefore
must be handled with care.
The extreme pressures developed in these bombs will tend
to deform the Teflon cup, making it difficult to remove the cup
from the bomb. To overcome this problem, Parr offers an A263AC
spanner jack that will push the cup out of the bomb with a
smooth, uniform pressure without damaging the cup. This
spanner jack is not included with the bomb and must be
ordered separately.
ORDERING INFORMATION
4746
Acid digestion bomb, high pressure, stainless steel
4747
Acid digestion bomb, high pressure, nickel
A255AC
Replacement Teflon cup with cover, 23 mL
252AC
Corrosion disc, .002”, T347SS
253AC
Rupture disc, .010”, T347SS
A263AC
Spanner jack assembly with 264AC face spanner
264AC
Face spanner only
Bulletin 4700
The A263AC Spanner-Jack holds the 4746 Bomb firmly during
opening and closing operations and provides a convenient tool
for pressing the Teflon cup out of the body.
