GJB 252A-2021
B501 Specification for Viton-Coated Glass Cloth (English Version)
- Standard No.
- GJB 252A-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 252A-2021
- Scope
- This specification specifies the requirements for B501 fluororubber coated glass cloth. This specification applies to the production and acceptance of B501 fluororubber coated glass cloth (hereinafter referred to as "fluororubber cloth").
- Introduction
Background of Standard Revision and Technological Evolution
As an alternative version of GJB 252-1987, GJB 252A-2021 reflects the technological progress of fluororubber coated glass cloth materials in the field of military aviation. The main technological evolution is reflected in:
Dimensions 1987 Edition 2021 Edition Scope of application Specific application scenarios are not specified Added RP-3 aviation fuel/YH-10 hydraulic oil environment Test medium Base oil test Refined high temperature (150℃) extreme condition test Storage conditions No specific temperature and humidity requirements Clear quantitative indicators of 0-28℃/RH≤80%
Analysis of core technical requirements
Physical performance indicators
The new standard puts forward clear requirements for the key performance of B501 fluorocarbon tape:
- Thickness control: (0.3±0.03)mm, 12% accuracy improvement
- Weight limit: ≤400g/m2, 15% lighter than the old version
- Heat resistance: 200℃/24h weight change ≤10%
Key points for the implementation of the quality assurance system
Inspection classification management case
The implementation of a military enterprise in Nantong shows that:
- Group A inspection: basic items such as appearance/thickness must be inspected for each roll
- Group B Inspection: Batch sampling for complex items such as oil resistance
- Double re-inspection mechanism for unqualified products
Recommendations for special application scenarios
According to Clause 6.1 of the standard, special attention should be paid to Fluorinated tape in the following scenarios:
Application environment Protection requirements Aircraft engine compartment Additional fire retardant coating is required Hydraulic system seal It is recommended to use with metal reinforcement layer
GJB 252A-2021 history
- 2021 GJB 252A-2021 B501 Specification for Viton-Coated Glass Cloth
- 1987 GJB 252-1987 B501 fluorine rubber coated glass cloth