Sample Blank ETT silicone-modified antimicrobial PE ETT with ratio of 2.6% Ag-SiO2 B1 B2 B3 C1 C2 C3 mWeight / Kg 2.3 2.3 2.2 2. 2 2.2 2.2 Tbefore /℃ 0 h 38.69 38.62 38.8 38.69 38.94 38.75 0.5h 38.63 38.5 38.86 38.69 38.87 38.69 38.66 38.56 38.83 38.69 38.9 38.72 Tafter/℃ 0.5h 38.57 38.56 38.81 38.37 38.62 38.44 1.0h 38.75 38.56 39.25 38.37 38.69 38.56 1.5h 38.75 38.69 39.31 38.25 38.69 38.63 2.0h 38.75 38.62 39.31 38.31 38.69 38.69 2.5h 38.75 38.56 39.25 38.25 38.69 38.63 3.0h 38.69 38.56 39.25 38.37 38.81 38.75 △T /°C △T=Tafter-, Tafter> 0.09 0.13 0.48 0 0 0.03 Σ△T/°C 0.7 0.03

Table 5: The results of pyrogen test of blank ETT and silicone-modified antimicrobial PE ETT with ratio of 2.6% Ag-SiO2.