Car PPF yellow, refers to the transparent PPF film exposed to natural light, ultraviolet, heat, oxygen, chemical erosion, water and so on the environment, as well as improper production process caused by the car color yellow phenomenon.

理論的には、時間と外的要因の影響下にあるすべてのアイテムは、ある程度の黄変が発生します。これは自然の法則です。 車の所有者は、透明PPFの黄変につながる可能性のある次の要因に従って、具体的な分析と判断を行うことができます.PPFフィルムが黄変するかどうかを決定するXNUMXつの主な要因：基材、接着剤、コーティング. その中でも下地が最も黄変しやすい素材です。

l Maximum possibility of clear PPF yellowing: substrate

PVC is the only material that will turn yellow in a very short time. You can think of it as hard plastic. It has poor stability to light and heat, and it is easy to yellow.

However, the lacquer protective film has developed to the present, and the material has been optimized for several generations. Now the car protective film simply named after PVC has disappeared. Therefore, the base material of car and clothing that is most likely to cause yeloration is basically TPH material.

TPH material is actually to add plasticizer to PVC material, so that the original hard plastic into a relatively good construction of soft plastic, but its nature is still PVC, so TPH material is very easy to yellow.

In addition, aromatic TPU base material, aromatic TPU base material contains benzene ring, easy to be affected by ultraviolet oxidation, irreversible yellowing, so it is completely unsuitable for automotive TPU base material.

Therefore, aliphatic TPU must be selected as the correct substrate for PPF, because its structure does not contain benzene ring, and the molecular arrangement density is dozens of times that of aromatic, which is not easy to be affected by ultraviolet oxidation and very resistant to yellow. Aliphatic TPU is generally used in high-end footwear, LED accessories, optical lenses, invisible clothing and other areas that have requirements for yellow resistance.