Especially in connection with solar control glass, three terms - and thus also three numerical values - are of central importance.
- Reflection - reflection of sun rays; mirror effect.
- Transmission - Letting the sun's rays through.
- Absorption - Absorption of solar radiation; dark surface.
None of these three properties exists in pure culture in glass as a building material. Each glass allows a certain amount of radiation to pass through (transmission) and stops part of it by absorption and reflection. The sum of reflection, transmission and absorption is always 100 percent.