1. Basic structural composition
Soundproof glass is typically composed of the following layers (from the outside to the inside) :
Outer glass (impact layer)
Tempered glass or chemically strengthened glass is usually adopted. It has high hardness, can withstand the initial impact and break into fine obtuse particles, reducing the damage caused by sharp fragments.
Middle interlayer (energy absorption layer)
Polyvinyl alcohol butyraldehyde (PVB) interlayer: The most common, with a thickness of several millimeters, it has high viscoelasticity, can absorb impact energy and prevent debris from splashing.
Ionic intermediate layers (such as SGP, EVA, etc.) : Higher-performance interlayer materials with stronger toughness and adhesion, often used in high-safety-level places.
Multi-layer laminated design: By superimposing multiple layers of glass and interlayers (such as "glass-PVB-glass-PVB-glass"), the explosion-proof performance is further enhanced.
Inner layer glass (safety layer)
It is usually tempered or laminated glass, used to further block penetration.
Optional additional layer
Polycarbonate (PC) layer: Added to the inner side of the glass, it can resist penetration and fragmentation due to its high toughness.
Bulletproof films (such as PET) : Enhance anti-fragmentation and anti-penetration capabilities.
Sound insulation middle layer: Some anti-explosion glass will be added with special acoustic damping materials, which also have sound insulation effects.
2. Working Principle
Energy dispersion: When the explosion shock wave acts on the outer layer of glass, the interlayer material absorbs energy through elastic deformation and disperses the stress throughout the entire surface.
Fragment control: Interlayer bonding of broken glass to prevent fragments from flying and injuring people.
Shock wave attenuation: The multi-layer structure can reflect, interfere with and absorb sound waves/shock waves, reducing noise and pressure transmission.
Flexible deformation: The polycarbonate layer or high-toughness interlayer undergoes plastic deformation rather than fragmentation when impacted, maintaining its integrity.
3. Special types
Composite explosion-proof glass: Combining the hardness of glass and the toughness of polycarbonate, such as the "glass +PC+ glass" structure.
Single-pane fireproof and explosion-proof glass: Made of special chemically strengthened glass, it has both fireproof and explosion-resistant functions.
Electromagnetic shielding version: Metal mesh or coating is added to the interlayer for anti-electromagnetic pulse (EMP) protection or in confidential areas.
4. Application scenarios
Military and government facilities: Embassies, command centers, explosion-proof vehicles.
Civil security: banks, airports, gas stations, chemical plants.
High-end buildings: Skyscrapers (anti-terrorist and anti-explosion), laboratories.
Special environments: Soundproof Windows in acoustic laboratories or near explosion test sites.
5. Performance standards
The grades of explosion-proof glass are usually classified based on indicators such as explosion pressure, duration of shock waves, and fragmentation grade (such as the UL 752 standard of the United States and the EN 13541 standard of the European Union).
The tests include high-speed impact, detonation wave pressure tests, debris ejection tests, etc.
Summary
The essence of explosion-proof glass is a multi-layer system of "sacrifice - absorption - barrier" : the outer layer of glass withstands the initial impact and breaks, the middle polymer interlayer dissipates energy and bonds the fragments through viscoelasticity, and the inner layer provides the final barrier. Its structure can be adjusted in terms of thickness, number of layers and material combination according to the protection level, achieving multi-functional integration such as anti-explosion, sound insulation and bulletproof.
