GJB 9470-2018
Specification for stealth glass for ships (English Version)
- Standard No.
- GJB 9470-2018
- Language
- Chinese, Available in English version
- Release Date
- 2018
- Published By
- Military Standard of the People's Republic of China-General Armament Department
- Latest
- GJB 9470-2018
- Introduction
Standard Overview and Technical Background
GJB 9470-2018 was issued by the Equipment Development Department of the Central Military Commission, which specifies the technical requirements for stealth non-electrically heated glass and electrically heated glass for ships. This standard integrates multidisciplinary technologies such as materials science, electromagnetics, and environmental engineering, marking an important progress in the systematic construction of stealth materials for ships in my country.
Analysis of core performance indicators
Performance category Non-electrically heated glass Electrically heated glass Test standard Transmittance ≥70% ≥68% GJB 1088-1991 Radar wave reflectivity 2-18GHz average ≤60% GJB 2038A-2011 Surface resistivity ≤109Ω/□ Four-probe method
Material and structural requirements
Typical structural composition
The standard stipulates that the product should be composed of two or more layers of reinforced glass sandwiched between an interlayer, an electric heating film and a stealth film, among which:
- Silicate glass must meet the physical toughening requirements of GJB 502A-1998
- The thickness deviation of the PVB interlayer is controlled within ±0.8mm (d<10mm)
- Pinholes, spots and other defects in the stealth film are strictly prohibited
Key tests for environmental adaptability
Test items Test conditions Qualification standard Salt spray test 72±2℃/10d Transmittance reduction ≤2% Vibration test Roll±45°(cycle 4-25s) No change in appearance Mold test 4 kinds of fungi including Aspergillus niger Mold growth level ≤Level 2
Implementation suggestions
Key points of production process control
- The lamination process needs to maintain a temperature uniformity of ≤11℃
- After film deposition, a 72-hour wet heat aging verification should be carried out
- Each batch of products must undergo a static pressure damage strength test (≥70kPa)
Quality assurance measures
It is recommended to establish a three-stage inspection system: raw material entry inspection (PVB film moisture content, etc.), process inspection (thickness deviation monitoring), and full factory inspection (including Group B environmental testing).
GJB 9470-2018 history
- 2018 GJB 9470-2018 Specification for stealth glass for ships