What is IR rejection?
Short Answer
IR rejection measures how much infrared radiation a film blocks. Infrared is the primary carrier of heat from sunlight, so high IR rejection means significantly less heat entering through the glass.
Full Explanation
Infrared radiation (IR) is invisible but is responsible for the majority of the heat you feel from sunlight. Window films with high IR rejection can dramatically reduce the heat entering a vehicle or building even if the film appears relatively light in color. This is why ceramic films — which can achieve very high IR rejection — are often preferred for comfort even at lighter VLT levels.
What to Consider
- IR is the primary heat carrier in sunlight
- High IR rejection = significantly less heat, even with lighter tint
- Ceramic films typically achieve the highest IR rejection
- IR rejection is measured at specific wavelengths — check manufacturer specs
- High IR rejection improves comfort without necessarily darkening the glass
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