GB/T 34938-2017 in English
VALIDGeneral technical requirements for planar electromagnetic shielding materials
- Issued on:2017-11-01
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 34938-2017平面型电磁屏蔽材料通用技术要求》由TC323（全国电磁屏蔽材料标准化技术委员会）归口，主管部门为中国电器工业协会。
Introduction
National Standard of the People's Republic of China GB/T 34938—2017
General Technical Requirements for Planar Electromagnetic Shielding Materials
Background and Significance of the Standard
With the rapid development of electronic equipment and communication technology, electromagnetic interference problems are becoming increasingly serious. GB/T 34938—2017 "General Technical Requirements for Planar Electromagnetic Shielding Materials" came into being, aiming to standardize the technical requirements of planar electromagnetic shielding materials and ensure their effective application in the fields of industry, communication, national defense, etc.
This standard covers a variety of shielding materials, including industrial electromagnetic shielding fabrics, conductive gaskets, electromagnetic shielding rubber, electromagnetic shielding plastics, etc., which are suitable for electromagnetic shielding needs in the frequency range of 0 Hz to 300 GHz.
Standard classification and technical requirements
| Material type | Main performance indicators | Applicable frequency range |
|---|---|---|
| Industrial electromagnetic shielding fabric | Shielding effectiveness ≥60 dB, surface resistance ≤1 Ω/cm | 10 MHz～3 GHz |
| Conductive pad | Shielding effectiveness ≥60 dB, contact resistivity ≤1 Ω/cm | 10 MHz～3 GHz |
| Electromagnetic shielding rubber | Shore hardness ≤80, tensile strength ≥2.0 MPa | 10 MHz～3 GHz |
Test methods and implementation suggestions
According to the standard requirements, all shielding materials must pass strict test methods to verify their performance. For example: the shielding effectiveness of electromagnetic shielding film must be ≥20 dB, the thermal shrinkage rate must be ≤2%, and the light transmittance must be ≥60%.
Practical application case analysis
In communication equipment, electromagnetic shielding metal plates (nets) are widely used to protect circuits from external interference. Its shielding effectiveness must exceed 20 dB to ensure the stability of signal transmission.
Implementation Suggestions
- When selecting shielding materials, the required frequency range and performance indicators must be determined according to the specific application scenario.
- Strictly test in accordance with standard requirements to ensure that the materials meet technical specifications.
- During transportation and storage, pay attention to moisture-proof, sun-proof and avoid mechanical damage to ensure product quality.
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