How to distinguish TPH PPF and TPU PPF

We know that TPU PPF and TPH PPF are not the same material, the quality is different, the service life is different, but how to distinguish the TPH PPF and TPU PPF?  In Duolite, we can easily tell from each other. Here are some ways for your reference.

1. Look at the transparency (look at the quality of the invisible car cover) High-quality and high-quality TPU substrate, the higher the transparency; poor quality, low transparency, offset printing color yellow.

2. Smell (see the quality of the invisible car cover) The high-quality invisible car cover basically has no smell after opening the box; the poor quality has a smell of chemicals.

3. Look at the elasticity (see the material of the invisible car cover) A good invisible car cover has a good stretch length, the coating will not break during the stretching process, and can be quickly restored after being released; the coating of poor quality is broken and cannot be restored after stretching. Possibly TPH impersonating.

4. Burn it with fire (see the material of the invisible car cover) The invisible car cover is not black smoke after burning and has a small smell; it is TPU; the black smoke after burning is pungent and pungent, it is PVC or TPH.