TPU material education · Guangzhou Yuehang · Published 14 November 2026
A clear way to compare thickness measurements and avoid counting packaging layers as protective film.
Convert the units first
One mil is one thousandth of an inch, equal to 25.4 microns. Therefore 7.5 mil equals 190.5 microns, and 8 mil equals 203.2 microns. These conversions describe a measurement, not a performance rating.
Compare the same construction
A supplier may describe the TPU base film, the coated face film or the face film plus adhesive. A reading taken through the protective cap and PET liner can be much larger. Ask for a written layer definition before comparing two thickness figures.
Thicker is one part of the decision
Film thickness affects handling, but buyers should also evaluate clarity, surface finish, adhesive behavior and fitting on the intended panels. A thicker number by itself does not establish a better coating, longer warranty or easier installation.
Keep an evaluation record
Record the model, nominal thickness and what it includes. Measure several points using a suitable gauge and an agreed method, without stretching the sample. Retain the sample and the supplier specification so future orders can be compared with the approved roll.
Next article: Choosing Color TPU PPF for a Vehicle Project →