Q10: What’s the unit of Haze ?

Question

Accepted Answer

Haze is a core optical performance indicator for glass, especially AG (Anti-Glare) glass, and its unit is **percentage (%)**. It is used to quantify the degree of light scattering when light passes through the glass, which directly affects the anti-glare effect, clarity, and visual experience of the glass.

### 1. Definition and Unit of Haze

Haze, also known as turbidity, is defined as the percentage of the transmitted light that deviates from the incident direction by more than 2.5° when parallel light passes through the glass, relative to the total transmitted light. The calculation formula is:

**Haze (%) = (Scattered Transmitted Light / Total Transmitted Light) × 100%**

The unit of haze is percentage (%), which is a dimensionless percentage value, used to intuitively reflect the light scattering ability of the glass. The higher the haze value, the stronger the light scattering ability of the glass, the better the anti-glare effect, but the slightly lower the clarity; the lower the haze value, the weaker the light scattering, the clearer the glass, but the slightly worse the anti-glare effect.

### 2. Measurement Standard and Method of Haze

The measurement of haze is carried out in strict accordance with international standards, such as **ASTM D1003** and **ISO 14782**. We use professional haze meters (also called transparency and haze meters) for measurement. The measurement process is as follows:

- **Instrument Calibration**: Calibrate the haze meter with a standard sample before measurement to ensure measurement accuracy.

- **Sample Preparation**: Clean the glass sample to be tested to ensure no dust, oil, or scratches on the surface, avoiding affecting the measurement results.

- **Measurement**: Place the sample in the haze meter, emit parallel light to pass through the sample, and the instrument automatically measures the total transmitted light and scattered transmitted light, and calculates the haze value.

- **Multiple Measurements**: Conduct multiple measurements on different positions of the sample to ensure the uniformity of the haze value of the glass.

### 3. Haze Range of AG Glass and Application Scenarios

FELIX GLASS can customize the haze value of AG glass according to customer needs, and the common haze range is **5% to 30%**, which is suitable for different application scenarios:

- **Low Haze (5%-10%)**: High clarity, slightly weaker anti-glare effect, suitable for indoor high-end displays, VR/AR headsets, and medical devices that require high visual clarity.

- **Medium Haze (10%-20%)**: Balance between anti-glare effect and clarity, the most commonly used haze range, suitable for automotive displays, industrial control screens, and consumer electronics touch screens.

- **High Haze (20%-30%)**: Strong anti-glare effect, slightly lower clarity, suitable for outdoor displays, public kiosks, and bright environments that require strong anti-glare.

### 4. FELIX GLASS's Haze Control Technology

We have advanced AG coating and etching technology, which can precisely control the haze value of AG glass, ensuring the uniformity and stability of the haze value of the same batch of products:

- **Precision Etching Technology**: Control the micro-roughness of the glass surface by adjusting the etching process parameters, so as to accurately control the haze value, with a control accuracy of ±1%.

- **Uniform Coating Technology**: Use vacuum coating technology to form a uniform anti-glare coating on the glass surface, ensuring that the haze value of each position of the glass is consistent, with no local difference.

- **Haze Quality Inspection**: Conduct 100% haze inspection on each AG glass product to ensure that the haze value meets the customer's specified range, and provide a detailed haze test report.

### 5. Factors Affecting Haze Value

The haze value of glass is mainly affected by the following factors:

- **Surface Roughness**: The higher the surface roughness of AG glass, the higher the haze value.

- **Coating Thickness and Uniformity**: The thickness and uniformity of the AG coating directly affect the haze value.

- **Glass Thickness**: The thicker the glass, the slightly higher the haze value, but the impact is small.

- **Measurement Environment**: The temperature, humidity, and light environment during measurement will affect the measurement results, so we carry out measurement in a standard laboratory environment.

### 6. How to Choose the Right Haze Value

When choosing the haze value of AG glass, you need to comprehensively consider the application scenario, use environment, and visual requirements:

- **Outdoor Use**: Choose high haze (20%-30%) to resist strong sunlight reflection.

- **Indoor High-End Use**: Choose low haze (5%-10%) to pursue high clarity.

- **General Touch Screen Use**: Choose medium haze (10%-20%) to balance anti-glare and clarity.

FELIX GLASS's professional technical team can provide you with professional haze value selection suggestions according to your product application scenarios and requirements, and customize AG glass products with the most suitable haze value to meet your visual and performance needs.

Q10: What’s the unit of Haze ?

With 19 years of experience as a precision optical glass expert, we provide comprehensive and satisfactory customized solutions.