GJB 9977-2021
Specification for Silicon Carbide Ceramic Composite Bulletproof Plate (English Version)
- Standard No.
- GJB 9977-2021
- Language
- Chinese, Available in English version
- Release Date
- 2021
- Published By
- Military Standard of the People's Republic of China-General Armament Department
- Latest
- GJB 9977-2021
- Introduction
Analysis of core technical indicators
Model Protection type Bulletproof requirements Mass limit(kg) Type I Cooperative protection Proof against 5.8mm ordinary bullets (920±10m/s) ≤1.9-2.1 Type II Independent protection Proof against 7.62mm armor-piercing incendiary bullets (878±10m/s) ≤2.4-2.95
Material system composition
The composite structure of silicon carbide ceramic plate (density 3-3.2g/cm3) and PE laminate (V50≥750m/s) is adopted, and the energy is absorbed step by step through the aramid crack arrest layer and epoxy resin transition layer. The surface adopts military green acrylic-polyurethane nano-composite coating with hardness ≥H grade.
Key inspection requirements
- Environmental adaptability:Must pass -40℃~55℃ temperature shock, 30min water immersion and 240h wet heat aging test
- Dent depth:Dent at impact point ≤25mm (refer to GJB 4300A-2012)
- Fatal defect:Direct rejection if ballistic performance is unqualified
Standard evolution background
Compared with the early GJB 5478-2006 standard, this specification clarifies for the first time the technical parameters of silicon carbide ceramics as the core ballistic material, increases the Vickers hardness from 18GPa to 21GPa, and increases the bending strength standard by 23%. New quality upper limit control requirements under the collaborative protection mode are added.
Implementation suggestions
- The ceramic sintering process needs to be monitored during the production process (±0.4mm thickness tolerance)
- It is recommended to use 3D scanning technology to accurately measure the protection area
- The storage environment humidity should be controlled below RH60%, and the stacking height should be ≤2m
GJB 9977-2021 history
- 2021 GJB 9977-2021 Specification for Silicon Carbide Ceramic Composite Bulletproof Plate