Sample ID

Coating formulations

Critical normal load for scratch visibility (N)

Top layer materials

Soft base layer thickness (µm)

TS

-

5.8

TB5

TMPTA

5

Over 20 N

TB15

15

Over 20 N

PS

-

Over 20 N

PB5

PETA

5

Over 20 N

PB15

15

Over 20 N