One-Way Mirror Glass (also known as One-Side Mirror or Semi-Reflective Glass) is a specialized glass that achieves one-way visibility through optical properties.
I. Fundamental Principle
Light condition dependence
(1) Bright side non perspective: When the reflective surface (mirror) faces the light source (such as outdoors) and the outdoor brightness is greater than indoors, the glass presents a mirror effect, and indoors cannot be seen through from outdoors, but outdoor scenery can be clearly observed indoors;
(2) Dim side bidirectional visibility: If the outdoor brightness is less than the indoor brightness, both directions can be seen through, and the clarity depends on the outdoor lighting intensity.
Technical upgrade direction
(1) Electromagnetic shielding layer: By 2025, a new type of one-way perspective window will achieve one-way perspective without relying on light intensity through a composite structure of "copper mesh+dark invisible paint", with improved light transmittance and resistance to electromagnetic interference;
(2) Vacuum magnetron coating: The surface is coated with a high refractive index metal film (such as silver/aluminum film), with a light transmittance of about 10% and a reflectivity of 75-85%, forming optical unidirectionality.
2、 Core performance parameters
| index |
Parameter Range/Characteristics |
Compared to traditional mirrors |
|
Light transmittance |
About 10% (low transparency ensures unidirectionality) |
The transmittance of tempered glass is about 5% |
|
reflectivity |
75-85% (imaging clarity better than ordinary mirrors) |
Ordinary mirror reflectivity ≤ 80% |
|
UV isolation |
>90% (protect indoor items from fading) |
Ordinary mirrors do not have special protection |
|
safety |
Tempered treatment, broken into particles without splashing |
Silver mirror not tempered, broken and prone to injury |
3、 Application scenarios and installation points
• Typical scenarios
Law enforcement venues: interrogation rooms, detention center identification rooms (concealed observation needs to be guaranteed);
Commercial space: psychological counseling room partition, dance classroom mirror wall (privacy+teaching needs);
Intelligent expansion: mirror display, dynamic dimming curtain wall (combined with dimming technology).
Installation specifications
The mirror surface must face the light source side (such as outdoors or monitoring area);
Avoid strong light sources indoors (ceiling lights must be turned off), otherwise reverse perspective is required;
Explosion proof type (10-12mm thickness) is preferred for high-rise buildings.
4、 Quality Identification and Maintenance
• Authenticity testing
Nail testing method: Fingertips stick to glass, genuine products have no gaps (ordinary mirror images have gaps with nails);
High light irradiation method: strong light directly shines on the surface, and the transparent glass is unidirectional;
Scratch test: The surface is prone to scratches (due to the fragile nature of the coating layer).
5、 Industry Trends
Photovoltaic integration: By 2025, new products will combine power generation functions and be suitable for low-carbon buildings;
Surface adaptation: Developing curved unidirectional glass to break through the limitations of flat surfaces.
One-way perspective glass
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GLASS ENCYCLOPEDIA
Can frosted glass be cleaned with wet wipes?
→ Okay! Recommend using glass cleaner and fish scale cloth to avoid scratching the matte layer with hard objects.
How to choose between single-sided frosted and double-sided frosted?
→Single sided frosted (smooth surface facing inward) is easier to clean; Double sided frosted provides stronger privacy.
Will frosted glass reduce light transmittance?
→ It will decrease by about 20% -40%, and the ultra white glass substrate can reduce the loss of light transmission.
What are the common glass products in daily life?
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