Some explanations of the parameters of coated glass

E value: Reflectivity

Reflectivity refers to the ratio of the infrared rays passing through the glass to the incident infrared rays. The smaller the reflectivity, the more heat is reflected back by the coating layer, and the better the heat insulation effect. (E = 0.0129R - 6.7 - 5R^2).

K value (U value)

It refers to the heat transfer rate per unit time through 1 square meter of insulating glass when the temperature difference between the air on both sides is 1°C under stable heat transfer conditions, expressed in W/m^2K. The lower the K value, the better the insulation and heat preservation performance of the insulating glass, and the more significant the energy-saving effect.

G value

G value is the solar gain value (shading coefficient). It is a quantity used to measure the total solar transmittance. In southern regions, a lower G value is preferred, while in northern regions, a higher G value is preferred. Feature:

1. Easy to produce, difficult to control color difference, poor chemical stability;
  
2. Colors: silver white, blue and brown;
  
3. Transmittance: 10 - 40%;
  
4. G value: 0.2 - 0.5.

Sunlight Control Film / SS Series Feature:

1. Easy to produce, difficult to control color difference, poor chemical stability;
2. Color: Silver white;
3. Transmittance: 8 - 20%;
4. G value: 0.2 - 0.3.

Sunlight control film (currently a popular film type in the European market) Feature:

1. High cost, resistant to wear;
2. Colors: silver white, blue, gold and brown;
3. Light transmittance: 8 - 20%;
4. G value: 0.2 - 0.3.

Sunlight control film / heat-treatable film system Feature:

1. High cost, resistant to wear and tear;
2. Colors: silver white, gray, blue, green and brown;
3. Transmittance: 8 - 40%;
4. Tempered glass, and the color will not change.

Standard Low-E film Feature:

1. Transmittance: 83%;
  
2. E value: < 0.06;
  
3. g value: 0.55 - 0.6.

Sunlight Low-E film Feature:

1. Transmittance: 48%
2. E value: < 0.1
3. g value: 0.5 - 0.55
Stress-resistant Low-E film Feature:

1. Transmittance: 82%;

2. Color: Silver white, gray, brown, blue and green;

3. E value: < 0.06;

4. g value: 0.55 - 0.6.

Double silver Low-E film Feature:

1. Transmittance: 75%;
2. E value: < 0.04;
3. g value: 0.4 - 0.5.