Vessel material	Absorbance			Critical surface tension	Water contact angles^**
Vessel material	Blank	Sample	Difference^*	Critical surface tension	Water contact angles^**
PC	0.373	0.695	0.322	44	82
PSF	0.451	0.693	0.242	42.1	70.5
PP	0.140	0.627	0.487	30.5	102.1
FEP	0.176	0.627	0.451	19.1	108.5