Ultra white glass: Why is it more transparent than ordinary glass?

In the fields of building curtain walls and high-end displays, ultra white glass is gradually replacing ordinary glass as the preferred material. What technological secrets are hidden behind the excellent optical performance of this new type of glass with a transmittance of over 91.5%?

 

1、 Iron content is key

Compositional differences

 

Ordinary glass: with an iron content of about 0.1% (presenting a green tone)

 

Ultra white glass: iron content ≤ 0.015% (only 1/7 of ordinary glass)

 

Technological breakthrough

 

Using low iron quartz sand as raw material

 

Special melting process for removing iron impurities

 

Oxidation reduction reaction control technology

 

2、 Optical performance comparison

Actual measurement of transmittance

 

Ordinary float glass: about 89% (6mm thickness)

 

Ultra white glass: 91.5% -92% (same thickness)

 

Color difference performance

 

Clear green edge visible on ordinary glass

 

Ultra white glass color difference Δ E ＜ 1.5 (almost indistinguishable to the naked eye)

 

3、 Production process upgrade

Melting process

 

Adopting pure oxygen combustion technology

 

Temperature control accuracy ± 1 ℃

 

Molding Process

 

The purity of the protective gas in the tin bath reaches 99.999%

 

Surface flatness<0.3 μ m/mm

 

4、 Application value enhancement

Construction field

 

Preferred for Building Integrated Photovoltaics (BIPV)

 

High end curtain wall improves transparency uniformity by 30%

 

Display Area

 

The reflectivity of museum display cabinets has been reduced to 0.5%

 

Luxury window display color rendering index Ra>98

 

Experimental data shows that when the glass thickness reaches 12mm, the light transmission advantage of ultra white glass is more obvious: about 15% more light is transmitted than ordinary glass of the same thickness. Although the production cost is 20-30% higher, the visual effect improvement and subsequent energy-saving benefits it brings make ultra white glass a cost-effective choice for high-end projects.