Table 5. Mechanical properties of the UV-cured PUA coatings.

Properties		PUA	PUA1	PUA2	PUA3	PUA4
DFT (micron)		50–60	55–60	50–60	50–55	50–60
Gloss (60°)		112.2	104.9	101.2	102.3	101.4
Cross-cut adhesion		Pass	Pass	Pass	Pass	Pass
Pencil hardness		4H	4H	5H	6H	5H
Scratch hardness (g)		2100	2250	2200	2250	2350
Impact resistance	Intrusion	112	112	112	112	112
	Extrusion	60	64	68	74	72
Flexibility (mm)		0	0	0	0	0