Skip to content
Infratint logo

Window film technology

Heat Rejection

Heat rejection describes a window film's ability to keep solar heat out of the cabin, usually summarised by total solar energy rejection or IRR; in Singapore conditions it is the metric that matters most.

"Heat rejection" is an umbrella term that drivers use casually, but technically it has two components: rejection of visible-spectrum heat (most cars feel this as steering-wheel temperature) and rejection of infrared (most cars feel this as cabin air temperature behind sun-warmed glass).

For an apples-to-apples comparison, look for either total solar energy rejection (full-spectrum) or IRR (infrared-band) values, not vague "heat rejection" percentages on marketing collateral. Reputable Singapore workshops will quote both.

Real-world impact: a Platinum99 fitment typically drops cabin temperature 8–14 °C versus untinted OEM glass at noon. That difference compounds across years of fuel and battery savings on EVs.