BB-C-101D
4.2.5.1 Grade A - medical. Grade A carbon dioxide shall be tested as specified in the USP-NF.
Failure to meet the acceptance criteria of one or more USP-NF tests shall be cause for rejection.
4.2.5.2 Grade B - technical. Grade B carbon dioxide shall be tested as specified in 4.3. The
moisture content determination specified in 4.3.2 may be sampled from the carbon dioxide liquid
in the container charging line or continuously monitored by instrument in lieu of sampling from
filled containers. The rate at which discrete samples are taken from a container charging line
shall be commensurate with and not less frequent than sampling done as specified in 4.2.1.
4.3 Test methods.
4.3.1 Purity. The purity of grade B carbon dioxide shall be determined by gas chromatography
or another appropriate instrumental method in accordance with CGA G-6.2. The carbon dioxide
container and its contents shall be at a temperature between 21 C (70 F) and 24 C (75 F).
Purity of the grade B carbon dioxide not meeting the requirements of 3.1.2 shall constitute
failure of this test.
4.3.2 Moisture content. The water content of grade B carbon dioxide shall be determined by one
of the appropriate analytical methods described in CGA G-6.2. The carbon dioxide sample for
the moisture content test shall be drawn from the container as a liquid. Grade B carbon dioxide
containing water in a quantity greater than 20 parts per million (v/v) at 760 mm of mercury and
21 °C (70 °F) shall constitute failure of this test.
4.3.3 Leakage. Each container shall be tested for leakage after filling by applying a soap
solution to all portions of the valve and the junction of the valve and cylinder. Care shall be
taken to ensure that the solution does not contaminate the valve outlet or chemically react with
the product in the cylinder. Any evidence of gas leakage as indicated by bubbling of the soap
solution shall constitute failure of this test.
5. PACKAGING
5.1 Packing, packaging, and marking. Packing, packaging, and marking shall be as specified in
the contract or acquisition order (see 6.2).
6. NOTES
INFORMATION FOR GUIDANCE ONLY. (This section contains information of a general or
explanatory nature that is helpful, but is not mandatory.)
6.1 Intended use. Grade A carbon dioxide gas is intended for medical use. Grade B carbon
dioxide gas is intended for airborne use, life raft inflation, fire extinguishing apparatus, and
general purpose use.
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