What differences between PC and TPU of LGF Raw Material?

Do you know what LGF is made of? One of the most important raw materials of LGF products is the medium material of light transmission, including TPU, PC and PMMA. The light emitting effect of different materials is greatly different, due to their different physical characteristics and thickness. PC (PC-Specification.pdf) is the most commonly used as light medium for light guide film, and its light emitting effect is relatively the best one. TPU is also used as light guide film, but very rarely. This is caused by the differences between PC and TPU as follows:

ItemPC materialTPU material
HardnessAround HR140HR70-80
Price/2-3 times compared with PC
Processing dot modePrinting, molding, rollingPrinting, radium carving
Influence on hand sensation after assembling keysThe click feeling of the key decrease by 5~10%The click feeling of the key decrease by 2~6%
Thickness of material0.1mm, 0.125mm, 0.175mm, 0.25mm, 0.38mm, 0.5mm0.1mm, 0.15mm
Resistance to chemical corrosionThe corrosion resistance is worse, but because the light guide film is a built-in component, it doesn’t come into contact with as many chemicals, so this factor is not considered as muchCorrosion resistance is better, so it is more suitable for external parts, external parts contact with chemical reagents will be more, such as watchband
Using impactPC will not have issue of yellowTPU will be became yellow after 2 years used, and it affects brightness and transmittance

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