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Thermal cracking mechanism and engineering response of single-piece fireproof glass

2025-07-02

latest company news about Thermal cracking mechanism and engineering response of single-piece fireproof glass 0

Introduction
As a key material for building exterior protection, the thermal cracking behavior of glass in fire directly affects the escape of personnel and the spread of fire. This article focuses on the thermal cracking mechanism of **single-piece fireproof glass (DFB)** and analyzes its fire-resistant nature.

1. The core driving force of thermal cracking: temperature difference stress
Research has confirmed (Xie, Keski-Rahkonen, etc.) that the fundamental cause of glass cracking is the critical thermal stress caused by **uneven heating:
Ordinary soda-lime glass: critical temperature difference is only **80~90℃
6mm tempered fireproof glass**: critical temperature difference **330~380℃
10mm tempered fireproof glass**: critical temperature difference **470~590℃
When the temperature difference between the exposed area (fired) and the shielded area (frame) of the glass exceeds the threshold in a fire, the tensile stress generated exceeds the tensile strength of the glass (usually 30~50MPa), which triggers the crack.

2. Key factors affecting cracking
| Edge processing quality | Mechanical polishing edge strength (78MPa) > rough grinding edge (56MPa), micro crack expansion strength attenuation 15%+ |
| Installation method | Point support stress concentration > frame installation; aluminum frame fire resistance > wooden frame |
| External intervention | Spray cooling will accelerate cracking when the glass temperature is > 250℃ |
| Glass type | Borosilicate glass (expansion coefficient 4×10⁻⁶/K) Thermal shock resistance Rolled soda-lime glass (9×10⁻⁶/K)

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China Joy Shing Glass is a professional and experienced glass company with more than 10 years which loacted in Yantai city China。

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