GJB/J 5125-2002

Acetaldehyde standard material specification (English Version)

Standard No.

GJB/J 5125-2002

Language

Chinese, Available in English version

Release Date

2002

Published By

Military Standard of the People's Republic of China-General Armament Department

Latest

GJB/J 5125-2002

Introduction

Core Technical Requirements of the Standard

Technical Indicators	Raw Material Requirements(%)	Finished Product Standards(%)
Acetaldehyde Content	≥99.7	≥99.9
Crotonaldehyde	≤0.03	≤0.005
Acetic Acid	≤0.04	≤0.017

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Value determination technology system

The standard requires the use of dual principle verification:

• Volumetric method (Appendix A): Hydrogenated hydroxylamine condensation reaction, precision ±0.5%
• Chromatographic method (Appendix B): SE-30 capillary column separation, range ≤0.1%

Typical application case

When a defense laboratory used SP3700 gas chromatograph for batch testing, it was found that the content of triacetaldehyde exceeded the limit of 0.003%. Through tracing, it was found that the storage temperature of the raw materials was below 0℃, resulting in self-polymerization, which verified the necessity of the storage temperature requirements in the standard.

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Innovation in Quality Assurance

Control Links	Military Standard Requirements	Comparison with Civilian Standards
Uniformity Test	95% Confidence Level Statistical Test	Usually no clear requirements
Stability Monitoring	Two-year Tracking + Extended Approval	Generally 1-year Validity Period
Fixed Value Laboratory	Cross-regional Multi-laboratory Verification	Common in a Single Laboratory

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Implementation Suggestions

1. Raw material control: It is recommended to establish a supplier file and conduct a full re-inspection of Table 2 for each batch
2. Key points of the process: Ampoule packaging requires strict nitrogen replacement and ice water cooling and sealing
3. Data management: The original data should retain one more significant digit than the standard requirement

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Standard evolution analysis

This specification inherits and develops basic standards such as GB/T 4883 and GJB 1886. The innovations are:

• For the first time, the two-year stability requirement for military reference materials is clarified
• Establishing a dedicated issuance system for national defense metrology institutions
• Introducing the expanded uncertainty expression