Window film technology
Micron Thickness
Micron thickness (μm) is the metric measurement of window film thickness; 1 mil ≈ 25.4 microns, with most automotive solar films sitting around 37–50 microns.
Most film manufacturers publish thickness in both mils and microns. For Singapore buyers reading European or Asian specs, you'll often see microns; for US-origin spec sheets you'll see mils.
The conversion: 1 mil = 25.4 μm. A 2-mil film = ~50 μm. A 4-mil security film = ~100 μm.
Thickness affects flexibility and durability. Side windows, which are mostly flat, tolerate any thickness. Coupe rear windscreens with deep curves install best with thinner film that can heat-shrink smoothly.