GB 45832-2025 in English

Standard background and scope of application

This standard is a mandatory safety specification for tempered glass and electrically heated glass used for ship portholes and rectangular windows. It puts forward systematic requirements for optical performance, mechanical strength and electrical safety in special marine environments. Technological evolution is mainly reflected in:

• Material upgrade: citing GB 11614-2022 high-quality processing-grade glass raw material standard
• Safety enhancement: adding insulation resistance (≥50MΩ) and dielectric strength (≤5mA) indicators for electrically heated glass
• Process control: refining the quantitative judgment standard for heating uniformity defects

Comparison of key technical requirements

Details of core test methods

Punch strength test

A graded loading mechanism is adopted, and the key parameters include:

• Loading rate: 1000N/s constant speed
• Holding time: Maintain for 5 seconds after reaching the target load
• Device classification: Type A (≥250mm) and Type B (200-250mm) differentiated tests

Key points of electrical performance test

Implementation suggestions

1. Material selection: High-quality float glass raw sheets are preferred to ensure processing-grade surface quality
2. Process control: The packaging of the electric heating element needs to be vacuum degassing to avoid uneven heating
3. Detection optimization: It is recommended to increase the regular calibration of the thermal imager to ensure the temperature measurement accuracy of ±0.2℃