MIL-PRF-27201E
2.3 Non-government publications. The following documents form a part of this document to the
extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the
solicitation or contract. (see 6.2)
ASTM INTERNATIONAL
ASTM E29
Standard Practice for Using Significant Digits in Test Data to Determine
Conformance with Specifications (DoD Adopted)
ASTM F307
Standard Practice for Sampling Pressurized Gas for Gas Analysis (DoD
Adopted)
ASTM F310
Standard Practice for Sampling Cryogenic Aerospace Fluids (DoD
Adopted)
(Copies of these documents are available online at https://www.astm.org or the ASTM International, 100
Barr Harbor Drive, P.O. Box C700, West Conshohocken PA 19428-2959)
COMPRESSED GAS ASSOCIATION (CGA)
CGA G-5.3
Commodity Specification for Hydrogen
CGA P-15
Filling of Industrial and Medical Nonflammable Compressed Gas
Cylinders
(Copies of these documents are available online at https://www.cganet.com or from the Compressed Gas
Association, Inc., 14501 George Carter Way, Suite 103, Chantilly VA 20151)
2.4 Order of precedence. In the event of a conflict between the text of this document and the
references cited herein (except for related specification sheets), the text of this document shall take
precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a
specific exemption has been obtained.
3.
REQUIREMENTS
3.1 Grade requirements. The purity and impurity concentrations shall conform to the limits of
Table I when tested in accordance with the applicable test method also specified in Table I. Other limits
and tests may be specified by the procuring activity (see 6.2).
TABLE I. Limits for hydrogen.
Test Method
99.995
4.4.2
Purity, % by vol, min
1
95.0
4.4.1
Parahydrogen % by vol, min
Impurities, ppm by vol, max
50
4.4.2
Nitrogen, water vapor, and total hydrocarbons
9.0
4.4.2
Oxygen and argon
1.0
4.4.2
Helium
39.0
4.4.2
Carbon monoxide and carbon dioxide
1.0
4.4.2
Notes
1. Applies to Type II only.
3
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