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. 2019 May 31;8(6):771. doi: 10.3390/jcm8060771

Figure 3.

Figure 3

Contact angle measurements of different FFF 3D printed PEEK samples. (a) untreated; (b) polished; (c) grit-blasted (50 µm); (d) grit-blasted (120 µm); (e) grit-blasted (250 µm); (f) quantitative contact angle values (means ± standard deviations). The dotted line indicates a contact angle of 90°, the borderline between hydrophilicity and hydrophobicity. U: untreated group; P: polished group; GB (50): grit-blasted group with 50 µm Al2O3 particles; GB (120): grit-blasted group with 120 µm Al2O3 particles; GB (250): grit-blasted group with 250 µm Al2O3 particles.